Bump platformio from 6.1.19 to 6.2.0

Bumps [platformio](https://github.com/platformio/platformio) from 6.1.19 to 6.2.0. - [Release notes](https://github.com/platformio/platformio/releases) - [Changelog](https://github.com/platformio/platformio-core/blob/develop/HISTORY.rst) - [Commits](https://github.com/platformio/platformio/compare/v6.1.19...v6.2.0) --- updated-dependencies: - dependency-name: platformio dependency-version: 6.2.0 dependency-type: direct:production update-type: version-update:semver-minor ... Signed-off-by: dependabot[bot] <support@github.com>
2026-09-11 07:17:33 +00:00 · 2026-09-10 15:01:47 +00:00
44 changed files with 3606 additions and 5463 deletions
@@ -22,7 +22,7 @@ RUN \
    -r /requirements.txt

 # Install the ESPHome Device Builder dashboard.
-RUN uv pip install --no-cache-dir esphome-device-builder==1.14.6
+RUN uv pip install --no-cache-dir esphome-device-builder==1.14.5

 RUN \
    platformio settings set enable_telemetry No \
@@ -77,7 +77,6 @@ service APIConnection {
  rpc serial_proxy_set_modem_pins(SerialProxySetModemPinsRequest) returns (void) {}
  rpc serial_proxy_get_modem_pins(SerialProxyGetModemPinsRequest) returns (void) {}
  rpc serial_proxy_request(SerialProxyRequest) returns (void) {}
-  rpc serial_proxy_set_mode(SerialProxySetModeRequest) returns (void) {}
 }


@@ -2727,8 +2726,7 @@ enum SerialProxyParity {
  SERIAL_PROXY_PARITY_ODD = 2;
 }

-// Configure UART parameters for a serial proxy instance. Only the subscribed client may
-// configure the port; others are refused with PORT_IN_USE (since API 1.17).
+// Configure UART parameters for a serial proxy instance
 message SerialProxyConfigureRequest {
  option (id) = 138;
  option (source) = SOURCE_CLIENT;
@@ -2754,8 +2752,7 @@ message SerialProxyDataReceived {
  bytes data = 2;               // Raw data received from the serial device
 }

-// Write data to a serial device. Only the subscribed client may write; writes from
-// others are ignored (since API 1.17).
+// Write data to a serial device
 message SerialProxyWriteRequest {
  option (id) = 140;
  option (source) = SOURCE_CLIENT;
@@ -2766,8 +2763,7 @@ message SerialProxyWriteRequest {
  bytes data = 2;               // Raw data to write to the serial device
 }

-// Set modem control pin states (RTS and DTR). Only the subscribed client may set them;
-// others are refused with PORT_IN_USE (since API 1.17).
+// Set modem control pin states (RTS and DTR)
 message SerialProxySetModemPinsRequest {
  option (id) = 141;
  option (source) = SOURCE_CLIENT;
@@ -2806,7 +2802,6 @@ enum SerialProxyRequestType {
  // error the device answers with INVALID_ARGUMENT.
  SERIAL_PROXY_REQUEST_TYPE_CONFIGURE = 3;      // Acknowledges a SerialProxyConfigureRequest
  SERIAL_PROXY_REQUEST_TYPE_SET_MODEM_PINS = 4; // Acknowledges a SerialProxySetModemPinsRequest
-  SERIAL_PROXY_REQUEST_TYPE_SET_MODE = 5;       // Acknowledges a SerialProxySetModeRequest (since API 1.17)
 }

 enum SerialProxyStatus {
@@ -2819,8 +2814,7 @@ enum SerialProxyStatus {
  SERIAL_PROXY_STATUS_INVALID_ARGUMENT = 6; // Invalid instance index or parameter value
 }

-// Generic request message for simple serial proxy operations. FLUSH requires an active
-// subscription; it is refused with PORT_IN_USE otherwise (since API 1.17).
+// Generic request message for simple serial proxy operations
 message SerialProxyRequest {
  option (id) = 144;
  option (source) = SOURCE_CLIENT;
@@ -2844,29 +2838,6 @@ message SerialProxyRequestResponse {
  string error_message = 4;            // Additional detail on failure (optional)
 }

-// How a port treats the bytes passing through it. RAW is a plain byte pipe; PROTOCOL
-// activates the port's protocol-aware tap (if one is configured), letting it observe
-// traffic and inject protocol bytes such as acknowledgements. Which protocol the tap
-// speaks is a property of the device configuration, discoverable from the tap
-// component's own API surface. A client that is about to flash firmware selects RAW
-// first, which definitively disables that injection.
-enum SerialProxyMode {
-  SERIAL_PROXY_MODE_RAW = 0;
-  SERIAL_PROXY_MODE_PROTOCOL = 1;
-}
-
-// Only the subscribed client may change the mode; any other caller -- including one that
-// never subscribed -- is refused with PORT_IN_USE. PROTOCOL is refused with NOT_SUPPORTED
-// when the port has no protocol-aware tap configured.
-message SerialProxySetModeRequest {
-  option (id) = 152;
-  option (source) = SOURCE_CLIENT;
-  option (ifdef) = "USE_SERIAL_PROXY";
-
-  uint32 instance = 1;
-  SerialProxyMode mode = 2;
-}
-
 // ==================== BLUETOOTH CONNECTION PARAMS ====================
 message BluetoothSetConnectionParamsRequest {
  option (id) = 145;
@@ -1661,7 +1661,6 @@ void APIConnection::on_serial_proxy_request(const SerialProxyRequest &msg) {
      break;
    case enums::SERIAL_PROXY_REQUEST_TYPE_CONFIGURE:
    case enums::SERIAL_PROXY_REQUEST_TYPE_SET_MODEM_PINS:
-    case enums::SERIAL_PROXY_REQUEST_TYPE_SET_MODE:
      // Response-only discriminators; never valid in a request
      ESP_LOGW(TAG, "Response-only serial proxy request type: %" PRIu32, static_cast<uint32_t>(msg.type));
      status = enums::SERIAL_PROXY_STATUS_INVALID_ARGUMENT;
@@ -1674,19 +1673,6 @@ void APIConnection::on_serial_proxy_request(const SerialProxyRequest &msg) {
  send_serial_proxy_ack(this, msg.instance, msg.type, status);
 }

-void APIConnection::on_serial_proxy_set_mode_request(const SerialProxySetModeRequest &msg) {
-  auto &proxies = App.get_serial_proxies();
-  if (msg.instance >= proxies.size()) {
-    ESP_LOGW(TAG, "Serial proxy instance %" PRIu32 " out of range", msg.instance);
-    send_serial_proxy_ack(this, msg.instance, enums::SERIAL_PROXY_REQUEST_TYPE_SET_MODE,
-                          enums::SERIAL_PROXY_STATUS_INVALID_ARGUMENT);
-    return;
-  }
-  serial_proxy::SerialProxyResult result = proxies[msg.instance]->set_mode_from_client(this, msg.mode);
-  send_serial_proxy_ack(this, msg.instance, enums::SERIAL_PROXY_REQUEST_TYPE_SET_MODE,
-                        serial_proxy_result_to_status(result));
-}
-
 void APIConnection::send_serial_proxy_data(const SerialProxyDataReceived &msg) {
  if (!this->send_message(msg)) {
    ESP_LOGV(TAG, "Serial proxy data dropped, TCP buffer full");
@@ -1813,7 +1799,7 @@ bool APIConnection::send_hello_response_(const HelloRequest &msg) {

  HelloResponse resp;
  resp.api_version_major = 1;
-  resp.api_version_minor = 17;
+  resp.api_version_minor = 16;
  // Send only the version string - the client only logs this for debugging and doesn't use it otherwise
  resp.server_info = ESPHOME_VERSION_REF;
  resp.name = StringRef(App.get_name());
@@ -2269,12 +2255,7 @@ bool APIConnection::send_message_(uint32_t payload_size, uint16_t message_type,
  // Capacity reserved above, cannot fail
  (void) shared_buf.resize(write_start + payload_size);
  ProtoWriteBuffer buffer{&shared_buf, write_start};
-  uint8_t *end = encode_fn(msg, buffer PROTO_ENCODE_DEBUG_INIT(&shared_buf));
-#ifdef ESPHOME_DEBUG_API
-  assert(end == shared_buf.data() + shared_buf.size());
-#else
-  (void) end;
-#endif
+  encode_fn(msg, buffer PROTO_ENCODE_DEBUG_INIT(&shared_buf));
  return this->send_buffer(ProtoWriteBuffer{&shared_buf}, message_type);
 }
 // encode_to_buffer is defined inline in api_connection.h (ESPHOME_ALWAYS_INLINE)
@@ -244,7 +244,6 @@ class APIConnection final : public APIServerConnectionBase {
  void on_serial_proxy_set_modem_pins_request(const SerialProxySetModemPinsRequest &msg);
  void on_serial_proxy_get_modem_pins_request(const SerialProxyGetModemPinsRequest &msg);
  void on_serial_proxy_request(const SerialProxyRequest &msg);
-  void on_serial_proxy_set_mode_request(const SerialProxySetModeRequest &msg);
  void send_serial_proxy_data(const SerialProxyDataReceived &msg);
 #endif

@@ -346,7 +345,11 @@ class APIConnection final : public APIServerConnectionBase {
  /// Returns false as soon as the TCP buffer is full. Marked nodiscard so we
  /// have no silent failures: every caller must handle (or log) a refusal.
  template<typename T> [[nodiscard]] bool send_message(const T &msg) {
-    return this->send_message_(T::calc_size_msg(&msg), T::MESSAGE_TYPE, &T::encode_msg, &msg);
+    if constexpr (T::ESTIMATED_SIZE == 0) {
+      return this->send_message_(0, T::MESSAGE_TYPE, &encode_msg_noop, &msg);
+    } else {
+      return this->send_message_(msg.calculate_size(), T::MESSAGE_TYPE, &proto_encode_msg<T>, &msg);
+    }
  }

  /// Clear the shared write buffer and reserve space for the first message.
@@ -402,6 +405,16 @@ class APIConnection final : public APIServerConnectionBase {
  void process_state_subscriptions_();
 #endif

+  // Size thunk — converts void* back to concrete type for direct calculate_size() call
+  template<typename T> static uint32_t calc_size(const void *msg) {
+    return static_cast<const T *>(msg)->calculate_size();
+  }
+
+  // Shared no-op encode thunk for empty messages (ESTIMATED_SIZE == 0)
+  static uint8_t *encode_msg_noop(const void *, ProtoWriteBuffer &buf PROTO_ENCODE_DEBUG_PARAM) {
+    return buf.get_pos();
+  }
+
  // Non-template buffer management for send_message
  bool send_message_(uint32_t payload_size, uint16_t message_type, MessageEncodeFn encode_fn, const void *msg);

@@ -420,7 +433,11 @@ class APIConnection final : public APIServerConnectionBase {
  // Hot paths (state/info) go through fill_and_encode_entity_state/info instead.
  // batch_message_type_ is already set by dispatch_message_ before reaching here.
  template<typename T> static uint16_t encode_message_to_buffer(T &msg, APIConnection *conn, uint32_t remaining_size) {
-    return encode_to_buffer_slow(T::calc_size_msg(&msg), &T::encode_msg, &msg, conn, remaining_size);
+    if constexpr (T::ESTIMATED_SIZE == 0) {
+      return encode_to_buffer_slow(0, &encode_msg_noop, &msg, conn, remaining_size);
+    } else {
+      return encode_to_buffer_slow(msg.calculate_size(), &proto_encode_msg<T>, &msg, conn, remaining_size);
+    }
  }

  // Non-template core — fills state fields and encodes
@@ -432,7 +449,7 @@ class APIConnection final : public APIServerConnectionBase {
  template<typename T>
  static uint16_t fill_and_encode_entity_state(EntityBase *entity, T &msg, APIConnection *conn,
                                               uint32_t remaining_size) {
-    return fill_and_encode_entity_state(entity, msg, &T::calc_size_msg, &T::encode_msg, conn, remaining_size);
+    return fill_and_encode_entity_state(entity, msg, &calc_size<T>, &proto_encode_msg<T>, conn, remaining_size);
  }

  // Non-template core — fills info fields, allocates buffers, and encodes
@@ -444,7 +461,7 @@ class APIConnection final : public APIServerConnectionBase {
  template<typename T>
  static uint16_t fill_and_encode_entity_info(EntityBase *entity, T &msg, APIConnection *conn,
                                              uint32_t remaining_size) {
-    return fill_and_encode_entity_info(entity, msg, &T::calc_size_msg, &T::encode_msg, conn, remaining_size);
+    return fill_and_encode_entity_info(entity, msg, &calc_size<T>, &proto_encode_msg<T>, conn, remaining_size);
  }

  // Non-template core — fills device_class, then delegates to fill_and_encode_entity_info
@@ -458,8 +475,8 @@ class APIConnection final : public APIServerConnectionBase {
  static uint16_t fill_and_encode_entity_info_with_device_class(EntityBase *entity, T &msg,
                                                                StringRef &device_class_field, APIConnection *conn,
                                                                uint32_t remaining_size) {
-    return fill_and_encode_entity_info_with_device_class(entity, msg, device_class_field, &T::calc_size_msg,
-                                                         &T::encode_msg, conn, remaining_size);
+    return fill_and_encode_entity_info_with_device_class(entity, msg, device_class_field, &calc_size<T>,
+                                                         &proto_encode_msg<T>, conn, remaining_size);
  }

 #ifdef USE_VOICE_ASSISTANT
@@ -46,13 +46,7 @@ inline uint16_t ESPHOME_ALWAYS_INLINE APIConnection::encode_to_buffer(uint32_t c
    return 0;
  }
  ProtoWriteBuffer buffer{&shared_buf, shared_buf.size() - calculated_size};
-  uint8_t *end = encode_fn(msg, buffer PROTO_ENCODE_DEBUG_INIT(&shared_buf));
-#ifdef ESPHOME_DEBUG_API
-  // A body that writes fewer bytes than calculate_size() promised would ship stale buffer bytes
-  assert(end == shared_buf.data() + shared_buf.size());
-#else
-  (void) end;
-#endif
+  encode_fn(msg, buffer PROTO_ENCODE_DEBUG_INIT(&shared_buf));

  return total_calculated_size;
 }
@@ -854,8 +854,6 @@ template<> const char *proto_enum_to_string<enums::SerialProxyRequestType>(enums
      return ESPHOME_PSTR("SERIAL_PROXY_REQUEST_TYPE_CONFIGURE");
    case enums::SERIAL_PROXY_REQUEST_TYPE_SET_MODEM_PINS:
      return ESPHOME_PSTR("SERIAL_PROXY_REQUEST_TYPE_SET_MODEM_PINS");
-    case enums::SERIAL_PROXY_REQUEST_TYPE_SET_MODE:
-      return ESPHOME_PSTR("SERIAL_PROXY_REQUEST_TYPE_SET_MODE");
    default:
      return ESPHOME_PSTR("UNKNOWN");
  }
@@ -880,16 +878,6 @@ template<> const char *proto_enum_to_string<enums::SerialProxyStatus>(enums::Ser
      return ESPHOME_PSTR("UNKNOWN");
  }
 }
-template<> const char *proto_enum_to_string<enums::SerialProxyMode>(enums::SerialProxyMode value) {
-  switch (value) {
-    case enums::SERIAL_PROXY_MODE_RAW:
-      return ESPHOME_PSTR("SERIAL_PROXY_MODE_RAW");
-    case enums::SERIAL_PROXY_MODE_PROTOCOL:
-      return ESPHOME_PSTR("SERIAL_PROXY_MODE_PROTOCOL");
-    default:
-      return ESPHOME_PSTR("UNKNOWN");
-  }
-}
 #endif

 const char *HelloRequest::dump_to(DumpBuffer &out) const {
@@ -2817,12 +2805,6 @@ const char *SerialProxyRequestResponse::dump_to(DumpBuffer &out) const {
  dump_field(out, ESPHOME_PSTR("error_message"), this->error_message);
  return out.c_str();
 }
-const char *SerialProxySetModeRequest::dump_to(DumpBuffer &out) const {
-  MessageDumpHelper helper(out, ESPHOME_PSTR("SerialProxySetModeRequest"));
-  dump_field(out, ESPHOME_PSTR("instance"), this->instance);
-  dump_field(out, ESPHOME_PSTR("mode"), static_cast<enums::SerialProxyMode>(this->mode));
-  return out.c_str();
-}
 #endif
 #ifdef USE_BLUETOOTH_PROXY_CONNECTIONS
 const char *BluetoothSetConnectionParamsRequest::dump_to(DumpBuffer &out) const {
@@ -712,17 +712,6 @@ void APIConnection::read_message_(uint32_t msg_size, uint32_t msg_type, const ui
      this->on_device_capabilities_request();
      break;
    }
-#ifdef USE_SERIAL_PROXY
-    case SerialProxySetModeRequest::MESSAGE_TYPE: {
-      SerialProxySetModeRequest msg;
-      msg.decode(msg_data, msg_size);
-#ifdef HAS_PROTO_MESSAGE_DUMP
-      this->log_receive_message_(LOG_STR("on_serial_proxy_set_mode_request"), msg);
-#endif
-      this->on_serial_proxy_set_mode_request(msg);
-      break;
-    }
-#endif
    default:
      break;
  }
@@ -235,9 +235,6 @@ class APIServerConnectionBase {
  void on_serial_proxy_request(const SerialProxyRequest &value){};
 #endif

-#ifdef USE_SERIAL_PROXY
-  void on_serial_proxy_set_mode_request(const SerialProxySetModeRequest &value){};
-#endif
 #ifdef USE_BLUETOOTH_PROXY_CONNECTIONS
  void on_bluetooth_set_connection_params_request(const BluetoothSetConnectionParamsRequest &value){};
 #endif
@@ -433,9 +433,8 @@ void APIServer::send_homeassistant_action(const HomeassistantActionRequest &call
    // Home Assistant subscribes to actions shortly *after* authenticating, so actions
    // fired right at connection time (on_client_connected, on_time_sync, ...) can
    // arrive before the subscription and are lost - warn instead of failing silently.
-    ESP_LOGW(TAG, "Home Assistant %s '%.*s' dropped; %s",
-             call.is_event ? LOG_STR_LITERAL("event") : LOG_STR_LITERAL("action"),
-             static_cast<int>(call.service.size()), call.service.empty() ? "" : call.service.c_str(),
+    ESP_LOGW(TAG, "Home Assistant %s '%s' dropped; %s",
+             call.is_event ? LOG_STR_LITERAL("event") : LOG_STR_LITERAL("action"), call.service.c_str(),
             this->is_connected() ? LOG_STR_LITERAL("client has not subscribed to actions (yet)")
                                  : LOG_STR_LITERAL("no client connected"));
  }
@@ -210,78 +210,77 @@ void ProtoWriteBuffer::debug_check_encode_size_(uint32_t field_id, uint32_t expe

 #endif

-void ProtoDecodableMessage::decode_fields(void *msg, const uint8_t *buffer, size_t length, DecodeFieldFn field) {
+void ProtoDecodableMessage::decode(const uint8_t *buffer, size_t length) {
  const uint8_t *ptr = buffer;
  const uint8_t *end = buffer + length;

-  // Single-byte varints dominate, so that case advances the cursor inline.
-  auto read_varint = [&](proto_varint_value_t &value) ESPHOME_ALWAYS_INLINE {
-    if (ptr == end)
-      return false;
-    if (*ptr < 0x80) [[likely]] {
-      value = *ptr++;
-      return true;
-    }
-    auto res = ProtoVarInt::parse_non_empty(ptr, end - ptr);
-    if (!res.has_value())
-      return false;
-    value = res.value;
-    ptr += res.consumed;
-    return true;
-  };
-
  while (ptr < end) {
-    proto_varint_value_t tag_value;
-    if (!read_varint(tag_value)) {
+    // Parse field header - ptr < end guarantees len >= 1
+    auto res = ProtoVarInt::parse_non_empty(ptr, end - ptr);
+    if (!res.has_value()) {
      ESP_LOGV(TAG, "Invalid field start at offset %ld", (long) (ptr - buffer));
      return;
    }

-    uint32_t tag = static_cast<uint32_t>(tag_value);
+    uint32_t tag = static_cast<uint32_t>(res.value);
    uint32_t field_type = tag & WIRE_TYPE_MASK;
-    // Length-delimited fields move this past the length prefix
-    const uint8_t *data = ptr;
-    proto_varint_value_t scalar;
+    uint32_t field_id = tag >> 3;
+    ptr += res.consumed;

-    if (field_type == WIRE_TYPE_VARINT) [[likely]] {
-      if (!read_varint(scalar)) {
-        ESP_LOGV(TAG, "Invalid VarInt at offset %ld", (long) (ptr - buffer));
-        return;
-      }
-    } else {
-      switch (field_type) {
-        case WIRE_TYPE_LENGTH_DELIMITED: {
-          proto_varint_value_t length_value;
-          if (!read_varint(length_value)) {
-            ESP_LOGV(TAG, "Invalid Length Delimited at offset %ld", (long) (ptr - buffer));
-            return;
-          }
-          uint32_t field_length = static_cast<uint32_t>(length_value);
-          if (field_length > static_cast<size_t>(end - ptr)) {
-            ESP_LOGV(TAG, "Out-of-bounds Length Delimited at offset %ld", (long) (ptr - buffer));
-            return;
-          }
-          data = ptr;
-          scalar = field_length;
-          ptr += field_length;
-          break;
-        }
-        case WIRE_TYPE_FIXED32: {
-          if (end - ptr < 4) {
-            ESP_LOGV(TAG, "Out-of-bounds Fixed32-bit at offset %ld", (long) (ptr - buffer));
-            return;
-          }
-          // Byte loads instead of memcpy: ESP-IDF passes -fno-builtin-memcpy, which made this a call
-          scalar = encode_uint32(ptr[3], ptr[2], ptr[1], ptr[0]);
-          ptr += 4;
-          break;
-        }
-        default:
-          ESP_LOGV(TAG, "Invalid field type %" PRIu32 " at offset %ld", field_type, (long) (ptr - buffer));
+    switch (field_type) {
+      case WIRE_TYPE_VARINT: {  // VarInt
+        res = ProtoVarInt::parse(ptr, end - ptr);
+        if (!res.has_value()) {
+          ESP_LOGV(TAG, "Invalid VarInt at offset %ld", (long) (ptr - buffer));
          return;
+        }
+        if (!this->decode_varint(field_id, res.value)) {
+          ESP_LOGV(TAG, "Cannot decode VarInt field %" PRIu32 " with value %" PRIu64 "!", field_id,
+                   static_cast<uint64_t>(res.value));
+        }
+        ptr += res.consumed;
+        break;
      }
+      case WIRE_TYPE_LENGTH_DELIMITED: {  // Length-delimited
+        res = ProtoVarInt::parse(ptr, end - ptr);
+        if (!res.has_value()) {
+          ESP_LOGV(TAG, "Invalid Length Delimited at offset %ld", (long) (ptr - buffer));
+          return;
+        }
+        uint32_t field_length = static_cast<uint32_t>(res.value);
+        ptr += res.consumed;
+        if (field_length > static_cast<size_t>(end - ptr)) {
+          ESP_LOGV(TAG, "Out-of-bounds Length Delimited at offset %ld", (long) (ptr - buffer));
+          return;
+        }
+        if (!this->decode_length(field_id, ProtoLengthDelimited(ptr, field_length))) {
+          ESP_LOGV(TAG, "Cannot decode Length Delimited field %" PRIu32 "!", field_id);
+        }
+        ptr += field_length;
+        break;
+      }
+      case WIRE_TYPE_FIXED32: {  // 32-bit
+        if (end - ptr < 4) {
+          ESP_LOGV(TAG, "Out-of-bounds Fixed32-bit at offset %ld", (long) (ptr - buffer));
+          return;
+        }
+        uint32_t val;
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+        // Protobuf fixed32 is little-endian — direct load on LE platforms
+        memcpy(&val, ptr, 4);
+#else
+        val = encode_uint32(ptr[3], ptr[2], ptr[1], ptr[0]);
+#endif
+        if (!this->decode_32bit(field_id, Proto32Bit(val))) {
+          ESP_LOGV(TAG, "Cannot decode 32-bit field %" PRIu32 " with value %" PRIu32 "!", field_id, val);
+        }
+        ptr += 4;
+        break;
+      }
+      default:
+        ESP_LOGV(TAG, "Invalid field type %" PRIu32 " at offset %ld", field_type, (long) (ptr - buffer));
+        return;
    }
-    field(msg, tag, data, scalar);
  }
 }

@@ -10,7 +10,6 @@

 #include <cassert>
 #include <cstring>
-#include <type_traits>
 #include <vector>

 #ifdef ESPHOME_LOG_HAS_VERY_VERBOSE
@@ -171,43 +170,40 @@ class ProtoVarInt {
 class ProtoMessage;
 class ProtoSize;

-/// Case label for decode_field(): the wire tag of a field, so a field that arrives with another wire
-/// type matches no case.
-constexpr uint32_t proto_tag(uint32_t field_id, uint32_t wire_type) { return (field_id << 3) | wire_type; }
-
-/// One decoded field: the payload pointer and a scalar holding the varint or fixed32 value, or the
-/// length of a length-delimited field. The wire type in the tag says which applies; accessors do not check.
-class ProtoFieldValue {
+class ProtoLengthDelimited {
 public:
-  ProtoFieldValue(const uint8_t *data, proto_varint_value_t scalar) : data_(data), scalar_(scalar) {}
+  explicit ProtoLengthDelimited(const uint8_t *value, size_t length) : value_(value), length_(length) {}
+  std::string as_string() const { return std::string(reinterpret_cast<const char *>(this->value_), this->length_); }

-  proto_varint_value_t as_varint() const { return this->scalar_; }
-  // A bool is sent as 0 or 1, so the low word is enough and saves a second compare with 64 bit varints
-  bool as_bool() const { return static_cast<uint32_t>(this->scalar_) != 0; }
+  // Direct access to raw data without string allocation
+  const uint8_t *data() const { return this->value_; }
+  size_t size() const { return this->length_; }

-  // Length-delimited accessors
-  const uint8_t *data() const { return this->data_; }
-  size_t size() const { return static_cast<size_t>(this->scalar_); }
-  std::string as_string() const { return std::string(reinterpret_cast<const char *>(this->data_), this->size()); }
-  /// Decode the length-delimited payload into a message instance.
+  /// Decode the length-delimited data into a message instance.
  /// Template preserves concrete type so decode() resolves statically.
-  template<typename T> void decode_to_message(T &msg) const { msg.decode(this->data_, this->size()); }
+  template<typename T> void decode_to_message(T &msg) const;

-  // Fixed32 accessors
-  uint32_t as_fixed32() const { return static_cast<uint32_t>(this->scalar_); }
-  int32_t as_sfixed32() const { return static_cast<int32_t>(this->as_fixed32()); }
+ protected:
+  const uint8_t *const value_;
+  const size_t length_;
+};
+
+class Proto32Bit {
+ public:
+  explicit Proto32Bit(uint32_t value) : value_(value) {}
+  uint32_t as_fixed32() const { return this->value_; }
+  int32_t as_sfixed32() const { return static_cast<int32_t>(this->value_); }
  float as_float() const {
    union {
      uint32_t raw;
      float value;
    } s{};
-    s.raw = this->as_fixed32();
+    s.raw = this->value_;
    return s.value;
  }

- private:
-  const uint8_t *data_;
-  proto_varint_value_t scalar_;
+ protected:
+  const uint32_t value_;
 };

 // NOTE: Proto64Bit class removed - wire type 1 (64-bit fixed) not supported
@@ -256,7 +252,7 @@ class ProtoWriteBuffer {
   *
   * Following https://protobuf.dev/programming-guides/encoding/#structure
   */
-  void encode_field_raw(uint32_t field_id, uint32_t type) { this->encode_varint_raw(proto_tag(field_id, type)); }
+  void encode_field_raw(uint32_t field_id, uint32_t type) { this->encode_varint_raw((field_id << 3) | type); }
  /// Single-pass encode for repeated submessage elements.
  /// Thin template wrapper; all buffer work is in the non-template core.
  template<typename T> void encode_sub_message(uint32_t field_id, const T &value);
@@ -291,31 +287,19 @@ class ProtoWriteBuffer {
  uint8_t *pos_;
 };

-// A four byte unaligned store is a memcpy call on ESP-IDF (-fno-builtin-memcpy) and on ARM cores without
-// unaligned access (Cortex-M0+, ARM9), so those targets share one outlined byte store helper per fixed32
-// field. Elsewhere the write inlines to a single store, or on ESP8266 to a few stores that measured
-// faster than a call, so it stays inline.
-#if defined(USE_ESP32) || (defined(__arm__) && !defined(__ARM_FEATURE_UNALIGNED))
-#define PROTO_OUTLINE_FOR_SIZE __attribute__((noinline))
-#define PROTO_FIXED32_BYTE_STORES true
-#else
-#define PROTO_OUTLINE_FOR_SIZE inline
-#define PROTO_FIXED32_BYTE_STORES false
-#endif
-
 // Varint encoding thresholds — used by both proto_encode_* free functions and ProtoSize.
 constexpr uint32_t VARINT_MAX_1_BYTE = 1 << 7;   // 128
 constexpr uint32_t VARINT_MAX_2_BYTE = 1 << 14;  // 16384

-/// Static encode helpers for the generated encode bodies. Each takes the write cursor by value and
-/// returns it advanced, so outlined calls at -Os chain through the return register instead of a
-/// stack slot. Helpers without a _force suffix skip fields holding the proto3 default.
+/// Static encode helpers for generated encode() functions.
+/// Generated code hoists buffer.pos_ into a local uint8_t *__restrict__ pos,
+/// then calls these methods which take pos by reference. No struct, no overhead.
+/// For sub-messages, pos is synced back to buffer before the call and reloaded after.
 class ProtoEncode {
 public:
  /// Write a multi-byte varint directly through a pos pointer.
  template<typename T>
-  [[nodiscard]] static inline uint8_t *encode_varint_raw_loop(uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM,
-                                                              T value) {
+  static inline void encode_varint_raw_loop(uint8_t *__restrict__ &pos PROTO_ENCODE_DEBUG_PARAM, T value) {
    do {
      PROTO_ENCODE_CHECK_BOUNDS(pos, 1);
      *pos++ = static_cast<uint8_t>(value | 0x80);
@@ -323,49 +307,48 @@ class ProtoEncode {
    } while (value > 0x7F);
    PROTO_ENCODE_CHECK_BOUNDS(pos, 1);
    *pos++ = static_cast<uint8_t>(value);
-    return pos;
  }
-  [[nodiscard]] static inline uint8_t *ESPHOME_ALWAYS_INLINE
-  encode_varint_raw(uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM, uint32_t value) {
+  static inline void ESPHOME_ALWAYS_INLINE encode_varint_raw(uint8_t *__restrict__ &pos PROTO_ENCODE_DEBUG_PARAM,
+                                                             uint32_t value) {
    if (value < VARINT_MAX_1_BYTE) [[likely]] {
      PROTO_ENCODE_CHECK_BOUNDS(pos, 1);
      *pos++ = static_cast<uint8_t>(value);
-      return pos;
+      return;
    }
-    return encode_varint_raw_loop(pos PROTO_ENCODE_DEBUG_ARG, value);
+    encode_varint_raw_loop(pos PROTO_ENCODE_DEBUG_ARG, value);
  }
  /// Encode a varint that is expected to be 1-2 bytes (e.g. zigzag RSSI, small lengths).
-  [[nodiscard]] static inline uint8_t *ESPHOME_ALWAYS_INLINE
-  encode_varint_raw_short(uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM, uint32_t value) {
+  static inline void ESPHOME_ALWAYS_INLINE encode_varint_raw_short(uint8_t *__restrict__ &pos PROTO_ENCODE_DEBUG_PARAM,
+                                                                   uint32_t value) {
    if (value < VARINT_MAX_1_BYTE) [[likely]] {
      PROTO_ENCODE_CHECK_BOUNDS(pos, 1);
      *pos++ = static_cast<uint8_t>(value);
-      return pos;
+      return;
    }
    if (value < VARINT_MAX_2_BYTE) [[likely]] {
      PROTO_ENCODE_CHECK_BOUNDS(pos, 2);
      *pos++ = static_cast<uint8_t>(value | 0x80);
      *pos++ = static_cast<uint8_t>(value >> 7);
-      return pos;
+      return;
    }
-    return encode_varint_raw_loop(pos PROTO_ENCODE_DEBUG_ARG, value);
+    encode_varint_raw_loop(pos PROTO_ENCODE_DEBUG_ARG, value);
  }
-  [[nodiscard]] static inline uint8_t *ESPHOME_ALWAYS_INLINE
-  encode_varint_raw_64(uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM, uint64_t value) {
+  static inline void ESPHOME_ALWAYS_INLINE encode_varint_raw_64(uint8_t *__restrict__ &pos PROTO_ENCODE_DEBUG_PARAM,
+                                                                uint64_t value) {
    if (value < VARINT_MAX_1_BYTE) [[likely]] {
      PROTO_ENCODE_CHECK_BOUNDS(pos, 1);
      *pos++ = static_cast<uint8_t>(value);
-      return pos;
+      return;
    }
-    return encode_varint_raw_loop(pos PROTO_ENCODE_DEBUG_ARG, value);
+    encode_varint_raw_loop(pos PROTO_ENCODE_DEBUG_ARG, value);
  }
  /// Encode a 48-bit MAC address (stored in a uint64) as varint.
  /// Real MAC addresses occupy the full 48 bits (OUI in upper 24), so the
  /// fast path -- any non-zero bit in the top 6 of 48 -- emits exactly 7 bytes
  /// with no per-byte branch. Falls back to the general loop otherwise.
  /// Caller must guarantee value fits in 48 bits (checked in debug builds).
-  [[nodiscard]] static inline uint8_t *ESPHOME_ALWAYS_INLINE
-  encode_varint_raw_48bit(uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM, uint64_t value) {
+  static inline void ESPHOME_ALWAYS_INLINE encode_varint_raw_48bit(uint8_t *__restrict__ &pos PROTO_ENCODE_DEBUG_PARAM,
+                                                                   uint64_t value) {
 #ifdef ESPHOME_DEBUG_API
    assert(value < (1ULL << (MAC_ADDRESS_SIZE * 8)) && "encode_varint_raw_48bit: value exceeds 48 bits");
 #endif
@@ -380,39 +363,38 @@ class ProtoEncode {
      pos[4] = static_cast<uint8_t>((value >> 28) | 0x80);
      pos[5] = static_cast<uint8_t>((value >> 35) | 0x80);
      pos[6] = static_cast<uint8_t>(value >> 42);
-      return pos + 7;
+      pos += 7;
+      return;
    }
-    return encode_varint_raw_64(pos PROTO_ENCODE_DEBUG_ARG, value);
+    encode_varint_raw_64(pos PROTO_ENCODE_DEBUG_ARG, value);
  }
-  [[nodiscard]] static inline uint8_t *ESPHOME_ALWAYS_INLINE
-  encode_field_raw(uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM, uint32_t field_id, uint32_t type) {
-    return encode_varint_raw(pos PROTO_ENCODE_DEBUG_ARG, proto_tag(field_id, type));
+  static inline void ESPHOME_ALWAYS_INLINE encode_field_raw(uint8_t *__restrict__ &pos PROTO_ENCODE_DEBUG_PARAM,
+                                                            uint32_t field_id, uint32_t type) {
+    encode_varint_raw(pos PROTO_ENCODE_DEBUG_ARG, (field_id << 3) | type);
  }
  /// Write a single precomputed tag byte. Tag must be < 128.
-  [[nodiscard]] static inline uint8_t *ESPHOME_ALWAYS_INLINE
-  write_raw_byte(uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM, uint8_t b) {
+  static inline void ESPHOME_ALWAYS_INLINE write_raw_byte(uint8_t *__restrict__ &pos PROTO_ENCODE_DEBUG_PARAM,
+                                                          uint8_t b) {
    PROTO_ENCODE_CHECK_BOUNDS(pos, 1);
    *pos++ = b;
-    return pos;
  }
  /// Reserve one byte for later backpatch (e.g., sub-message length).
  /// Advances pos past the reserved byte without writing a value.
-  [[nodiscard]] static inline uint8_t *ESPHOME_ALWAYS_INLINE
-  reserve_byte(uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM) {
+  static inline void ESPHOME_ALWAYS_INLINE reserve_byte(uint8_t *__restrict__ &pos PROTO_ENCODE_DEBUG_PARAM) {
    PROTO_ENCODE_CHECK_BOUNDS(pos, 1);
-    return pos + 1;
+    pos++;
  }
  /// Write raw bytes to the buffer (no tag, no length prefix).
-  [[nodiscard]] static inline uint8_t *ESPHOME_ALWAYS_INLINE
-  encode_raw(uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM, const void *data, size_t len) {
+  static inline void ESPHOME_ALWAYS_INLINE encode_raw(uint8_t *__restrict__ &pos PROTO_ENCODE_DEBUG_PARAM,
+                                                      const void *data, size_t len) {
    PROTO_ENCODE_CHECK_BOUNDS(pos, len);
    std::memcpy(pos, data, len);
-    return pos + len;
+    pos += len;
  }
  /// Encode tag + 1-byte length + raw string data. For strings with max_data_length < 128.
  /// Tag must be a single-byte varint (< 128). Always encodes (no zero check).
-  [[nodiscard]] static inline uint8_t *encode_short_string_force(uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM,
-                                                                 uint8_t tag, const StringRef &ref) {
+  static inline void encode_short_string_force(uint8_t *__restrict__ &pos PROTO_ENCODE_DEBUG_PARAM, uint8_t tag,
+                                               const StringRef &ref) {
 #ifdef ESPHOME_DEBUG_API
    assert(ref.size() < 128 && "encode_short_string_force: string exceeds max_data_length < 128");
 #endif
@@ -420,191 +402,137 @@ class ProtoEncode {
    pos[0] = tag;
    pos[1] = static_cast<uint8_t>(ref.size());
    std::memcpy(pos + 2, ref.c_str(), ref.size());
-    return pos + 2 + ref.size();
+    pos += 2 + ref.size();
  }
-  /// Write a precomputed tag byte + 32-bit value. Outlined on embedded: one copy beats inline stores per field.
-  [[nodiscard]] static PROTO_OUTLINE_FOR_SIZE uint8_t *write_tag_and_fixed32(
-      uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM, uint8_t tag, uint32_t value) {
+  /// Write a precomputed tag byte + 32-bit value in one operation.
+  static inline void ESPHOME_ALWAYS_INLINE write_tag_and_fixed32(uint8_t *__restrict__ &pos PROTO_ENCODE_DEBUG_PARAM,
+                                                                 uint8_t tag, uint32_t value) {
    PROTO_ENCODE_CHECK_BOUNDS(pos, 5);
    pos[0] = tag;
-    write_fixed32_le(pos + 1, value);
-    return pos + 5;
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+    std::memcpy(pos + 1, &value, 4);
+#else
+    pos[1] = static_cast<uint8_t>(value & 0xFF);
+    pos[2] = static_cast<uint8_t>((value >> 8) & 0xFF);
+    pos[3] = static_cast<uint8_t>((value >> 16) & 0xFF);
+    pos[4] = static_cast<uint8_t>((value >> 24) & 0xFF);
+#endif
+    pos += 5;
  }
-  [[nodiscard]] static inline uint8_t *encode_string_force(uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM,
-                                                           uint32_t field_id, const char *string, size_t len) {
-    pos = encode_field_raw(pos PROTO_ENCODE_DEBUG_ARG, field_id, 2);  // type 2: Length-delimited string
+  static inline void encode_string(uint8_t *__restrict__ &pos PROTO_ENCODE_DEBUG_PARAM, uint32_t field_id,
+                                   const char *string, size_t len, bool force = false) {
+    if (len == 0 && !force)
+      return;
+    encode_field_raw(pos PROTO_ENCODE_DEBUG_ARG, field_id, 2);  // type 2: Length-delimited string
    // NOLINTNEXTLINE(readability-inconsistent-ifelse-braces) -- false positive on [[likely]] attribute
    if (len < VARINT_MAX_1_BYTE) [[likely]] {
      PROTO_ENCODE_CHECK_BOUNDS(pos, 1 + len);
      *pos++ = static_cast<uint8_t>(len);
    } else {
-      pos = encode_varint_raw_loop(pos PROTO_ENCODE_DEBUG_ARG, len);
+      encode_varint_raw_loop(pos PROTO_ENCODE_DEBUG_ARG, len);
      PROTO_ENCODE_CHECK_BOUNDS(pos, len);
    }
    std::memcpy(pos, string, len);
-    return pos + len;
+    pos += len;
  }
-  [[nodiscard]] static inline uint8_t *encode_string(uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM,
-                                                     uint32_t field_id, const char *string, size_t len) {
-    if (len == 0)
-      return pos;
-    return encode_string_force(pos PROTO_ENCODE_DEBUG_ARG, field_id, string, len);
+  static inline void encode_string(uint8_t *__restrict__ &pos PROTO_ENCODE_DEBUG_PARAM, uint32_t field_id,
+                                   const std::string &value, bool force = false) {
+    encode_string(pos PROTO_ENCODE_DEBUG_ARG, field_id, value.data(), value.size(), force);
  }
-  [[nodiscard]] static inline uint8_t *encode_string_force(uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM,
-                                                           uint32_t field_id, const std::string &value) {
-    return encode_string_force(pos PROTO_ENCODE_DEBUG_ARG, field_id, value.data(), value.size());
+  static inline void encode_string(uint8_t *__restrict__ &pos PROTO_ENCODE_DEBUG_PARAM, uint32_t field_id,
+                                   const StringRef &ref, bool force = false) {
+    encode_string(pos PROTO_ENCODE_DEBUG_ARG, field_id, ref.c_str(), ref.size(), force);
  }
-  [[nodiscard]] static inline uint8_t *encode_string(uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM,
-                                                     uint32_t field_id, const StringRef &ref) {
-    return encode_string(pos PROTO_ENCODE_DEBUG_ARG, field_id, ref.c_str(), ref.size());
+  static inline void encode_bytes(uint8_t *__restrict__ &pos PROTO_ENCODE_DEBUG_PARAM, uint32_t field_id,
+                                  const uint8_t *data, size_t len, bool force = false) {
+    encode_string(pos PROTO_ENCODE_DEBUG_ARG, field_id, reinterpret_cast<const char *>(data), len, force);
  }
-  [[nodiscard]] static inline uint8_t *encode_string_force(uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM,
-                                                           uint32_t field_id, const StringRef &ref) {
-    return encode_string_force(pos PROTO_ENCODE_DEBUG_ARG, field_id, ref.c_str(), ref.size());
+  static inline void encode_uint32(uint8_t *__restrict__ &pos PROTO_ENCODE_DEBUG_PARAM, uint32_t field_id,
+                                   uint32_t value, bool force = false) {
+    if (value == 0 && !force)
+      return;
+    encode_field_raw(pos PROTO_ENCODE_DEBUG_ARG, field_id, 0);
+    encode_varint_raw(pos PROTO_ENCODE_DEBUG_ARG, value);
  }
-  [[nodiscard]] static inline uint8_t *encode_bytes(uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM,
-                                                    uint32_t field_id, const uint8_t *data, size_t len) {
-    return encode_string(pos PROTO_ENCODE_DEBUG_ARG, field_id, reinterpret_cast<const char *>(data), len);
+  static inline void encode_uint64(uint8_t *__restrict__ &pos PROTO_ENCODE_DEBUG_PARAM, uint32_t field_id,
+                                   uint64_t value, bool force = false) {
+    if (value == 0 && !force)
+      return;
+    encode_field_raw(pos PROTO_ENCODE_DEBUG_ARG, field_id, 0);
+    encode_varint_raw_64(pos PROTO_ENCODE_DEBUG_ARG, value);
  }
-  [[nodiscard]] static inline uint8_t *encode_bytes_force(uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM,
-                                                          uint32_t field_id, const uint8_t *data, size_t len) {
-    return encode_string_force(pos PROTO_ENCODE_DEBUG_ARG, field_id, reinterpret_cast<const char *>(data), len);
-  }
-  [[nodiscard]] static inline uint8_t *encode_uint32_force(uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM,
-                                                           uint32_t field_id, uint32_t value) {
-    pos = encode_field_raw(pos PROTO_ENCODE_DEBUG_ARG, field_id, 0);
-    return encode_varint_raw(pos PROTO_ENCODE_DEBUG_ARG, value);
-  }
-  [[nodiscard]] static inline uint8_t *encode_uint32(uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM,
-                                                     uint32_t field_id, uint32_t value) {
-    if (value == 0)
-      return pos;
-    return encode_uint32_force(pos PROTO_ENCODE_DEBUG_ARG, field_id, value);
-  }
-  [[nodiscard]] static inline uint8_t *encode_uint64_force(uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM,
-                                                           uint32_t field_id, uint64_t value) {
-    pos = encode_field_raw(pos PROTO_ENCODE_DEBUG_ARG, field_id, 0);
-    return encode_varint_raw_64(pos PROTO_ENCODE_DEBUG_ARG, value);
-  }
-  [[nodiscard]] static inline uint8_t *encode_uint64(uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM,
-                                                     uint32_t field_id, uint64_t value) {
-    if (value == 0)
-      return pos;
-    return encode_uint64_force(pos PROTO_ENCODE_DEBUG_ARG, field_id, value);
-  }
-  [[nodiscard]] static inline uint8_t *encode_bool_force(uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM,
-                                                         uint32_t field_id, bool value) {
-    pos = encode_field_raw(pos PROTO_ENCODE_DEBUG_ARG, field_id, 0);
+  static inline void encode_bool(uint8_t *__restrict__ &pos PROTO_ENCODE_DEBUG_PARAM, uint32_t field_id, bool value,
+                                 bool force = false) {
+    if (!value && !force)
+      return;
+    encode_field_raw(pos PROTO_ENCODE_DEBUG_ARG, field_id, 0);
    PROTO_ENCODE_CHECK_BOUNDS(pos, 1);
    *pos++ = value ? 0x01 : 0x00;
-    return pos;
  }
-  [[nodiscard]] static inline uint8_t *encode_bool(uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM,
-                                                   uint32_t field_id, bool value) {
-    if (!value)
-      return pos;
-    return encode_bool_force(pos PROTO_ENCODE_DEBUG_ARG, field_id, value);
-  }
-  /// Tag + fixed32 for multi-byte tags; single-byte tags use write_tag_and_fixed32.
-  [[nodiscard]] static PROTO_OUTLINE_FOR_SIZE uint8_t *encode_fixed32_force(
-      uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM, uint32_t field_id, uint32_t value) {
-    pos = encode_field_raw(pos PROTO_ENCODE_DEBUG_ARG, field_id, 5);
+  static inline void encode_fixed32(uint8_t *__restrict__ &pos PROTO_ENCODE_DEBUG_PARAM, uint32_t field_id,
+                                    uint32_t value, bool force = false) {
+    if (value == 0 && !force)
+      return;
+    encode_field_raw(pos PROTO_ENCODE_DEBUG_ARG, field_id, 5);
    PROTO_ENCODE_CHECK_BOUNDS(pos, 4);
-    write_fixed32_le(pos, value);
-    return pos + 4;
-  }
-  [[nodiscard]] static inline uint8_t *encode_fixed32(uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM,
-                                                      uint32_t field_id, uint32_t value) {
-    if (value == 0)
-      return pos;
-    return encode_fixed32_force(pos PROTO_ENCODE_DEBUG_ARG, field_id, value);
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+    std::memcpy(pos, &value, 4);
+    pos += 4;
+#else
+    *pos++ = (value >> 0) & 0xFF;
+    *pos++ = (value >> 8) & 0xFF;
+    *pos++ = (value >> 16) & 0xFF;
+    *pos++ = (value >> 24) & 0xFF;
+#endif
  }
  // NOTE: Wire type 1 (64-bit fixed: double, fixed64, sfixed64) is intentionally
  // not supported to reduce overhead on embedded systems. All ESPHome devices are
  // 32-bit microcontrollers where 64-bit operations are expensive. If 64-bit support
  // is needed in the future, the necessary encoding/decoding functions must be added.
-  [[nodiscard]] static inline uint8_t *encode_float(uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM,
-                                                    uint32_t field_id, float value) {
-    return encode_fixed32(pos PROTO_ENCODE_DEBUG_ARG, field_id, float_to_raw(value));
+  static inline void encode_float(uint8_t *__restrict__ &pos PROTO_ENCODE_DEBUG_PARAM, uint32_t field_id, float value,
+                                  bool force = false) {
+    uint32_t raw = float_to_raw(value);
+    if (raw == 0 && !force)
+      return;
+    encode_fixed32(pos PROTO_ENCODE_DEBUG_ARG, field_id, raw);
  }
-  [[nodiscard]] static inline uint8_t *encode_float_force(uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM,
-                                                          uint32_t field_id, float value) {
-    return encode_fixed32_force(pos PROTO_ENCODE_DEBUG_ARG, field_id, float_to_raw(value));
-  }
-  [[nodiscard]] static inline uint8_t *encode_int32_force(uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM,
-                                                          uint32_t field_id, int32_t value) {
+  static inline void encode_int32(uint8_t *__restrict__ &pos PROTO_ENCODE_DEBUG_PARAM, uint32_t field_id, int32_t value,
+                                  bool force = false) {
    if (value < 0) {
      // negative int32 is always 10 byte long
-      return encode_uint64_force(pos PROTO_ENCODE_DEBUG_ARG, field_id, static_cast<uint64_t>(value));
+      encode_uint64(pos PROTO_ENCODE_DEBUG_ARG, field_id, static_cast<uint64_t>(value), force);
+      return;
    }
-    return encode_uint32_force(pos PROTO_ENCODE_DEBUG_ARG, field_id, static_cast<uint32_t>(value));
+    encode_uint32(pos PROTO_ENCODE_DEBUG_ARG, field_id, static_cast<uint32_t>(value), force);
  }
-  [[nodiscard]] static inline uint8_t *encode_int32(uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM,
-                                                    uint32_t field_id, int32_t value) {
-    if (value == 0)
-      return pos;
-    return encode_int32_force(pos PROTO_ENCODE_DEBUG_ARG, field_id, value);
+  static inline void encode_int64(uint8_t *__restrict__ &pos PROTO_ENCODE_DEBUG_PARAM, uint32_t field_id, int64_t value,
+                                  bool force = false) {
+    encode_uint64(pos PROTO_ENCODE_DEBUG_ARG, field_id, static_cast<uint64_t>(value), force);
  }
-  [[nodiscard]] static inline uint8_t *encode_int64(uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM,
-                                                    uint32_t field_id, int64_t value) {
-    return encode_uint64(pos PROTO_ENCODE_DEBUG_ARG, field_id, static_cast<uint64_t>(value));
+  static inline void encode_sint32(uint8_t *__restrict__ &pos PROTO_ENCODE_DEBUG_PARAM, uint32_t field_id,
+                                   int32_t value, bool force = false) {
+    encode_uint32(pos PROTO_ENCODE_DEBUG_ARG, field_id, encode_zigzag32(value), force);
  }
-  [[nodiscard]] static inline uint8_t *encode_int64_force(uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM,
-                                                          uint32_t field_id, int64_t value) {
-    return encode_uint64_force(pos PROTO_ENCODE_DEBUG_ARG, field_id, static_cast<uint64_t>(value));
+  static inline void encode_sint64(uint8_t *__restrict__ &pos PROTO_ENCODE_DEBUG_PARAM, uint32_t field_id,
+                                   int64_t value, bool force = false) {
+    encode_uint64(pos PROTO_ENCODE_DEBUG_ARG, field_id, encode_zigzag64(value), force);
  }
-  [[nodiscard]] static inline uint8_t *encode_sint32(uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM,
-                                                     uint32_t field_id, int32_t value) {
-    return encode_uint32(pos PROTO_ENCODE_DEBUG_ARG, field_id, encode_zigzag32(value));
-  }
-  [[nodiscard]] static inline uint8_t *encode_sint32_force(uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM,
-                                                           uint32_t field_id, int32_t value) {
-    return encode_uint32_force(pos PROTO_ENCODE_DEBUG_ARG, field_id, encode_zigzag32(value));
-  }
-  [[nodiscard]] static inline uint8_t *encode_sint64(uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM,
-                                                     uint32_t field_id, int64_t value) {
-    return encode_uint64(pos PROTO_ENCODE_DEBUG_ARG, field_id, encode_zigzag64(value));
-  }
-  [[nodiscard]] static inline uint8_t *encode_sint64_force(uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM,
-                                                           uint32_t field_id, int64_t value) {
-    return encode_uint64_force(pos PROTO_ENCODE_DEBUG_ARG, field_id, encode_zigzag64(value));
-  }
-  /// Sub-message encoding: sync pos to buffer, delegate, read the cursor back.
+  /// Sub-message encoding: sync pos to buffer, delegate, get pos from return value.
  template<typename T>
-  [[nodiscard]] static inline uint8_t *encode_sub_message(uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM,
-                                                          ProtoWriteBuffer &buffer, uint32_t field_id, const T &value) {
+  static inline void encode_sub_message(uint8_t *__restrict__ &pos PROTO_ENCODE_DEBUG_PARAM, ProtoWriteBuffer &buffer,
+                                        uint32_t field_id, const T &value) {
    buffer.set_pos(pos);
    buffer.encode_sub_message(field_id, value);
-    return buffer.get_pos();
+    pos = buffer.get_pos();
  }
  template<typename T>
-  [[nodiscard]] static inline uint8_t *encode_optional_sub_message(uint8_t *__restrict__ pos PROTO_ENCODE_DEBUG_PARAM,
-                                                                   ProtoWriteBuffer &buffer, uint32_t field_id,
-                                                                   const T &value) {
+  static inline void encode_optional_sub_message(uint8_t *__restrict__ &pos PROTO_ENCODE_DEBUG_PARAM,
+                                                 ProtoWriteBuffer &buffer, uint32_t field_id, const T &value) {
    buffer.set_pos(pos);
    buffer.encode_optional_sub_message(field_id, value);
-    return buffer.get_pos();
-  }
-
- private:
-  /// Unaligned little endian store of four bytes: byte stores where the outlined helper lives (ESP-IDF, ARM
-  /// without unaligned access), otherwise a memcpy the compiler folds into one store. Callers bounds check
-  /// and advance the cursor themselves.
-  static inline void ESPHOME_ALWAYS_INLINE write_fixed32_le(uint8_t *__restrict__ pos, uint32_t value) {
-    if constexpr (PROTO_FIXED32_BYTE_STORES) {
-      // Spelled out so the outlined helper does not itself become a memcpy call
-      pos[0] = static_cast<uint8_t>(value);
-      pos[1] = static_cast<uint8_t>(value >> 8);
-      pos[2] = static_cast<uint8_t>(value >> 16);
-      pos[3] = static_cast<uint8_t>(value >> 24);
-    } else {
-      const uint32_t le = convert_little_endian(value);
-      __builtin_memcpy(pos, &le, 4);
-    }
+    pos = buffer.get_pos();
  }
 };
-#undef PROTO_OUTLINE_FOR_SIZE
-#undef PROTO_FIXED32_BYTE_STORES

 #ifdef HAS_PROTO_MESSAGE_DUMP
 /**
@@ -696,12 +624,11 @@ class DumpBuffer {

 class ProtoMessage {
 public:
-  // Non-virtual defaults for messages with no fields; generated classes hide all four. The
-  // static encode_msg/calc_size_msg take const void * so &T::encode_msg needs no thunk.
-  static uint8_t *encode_msg(const void *self, ProtoWriteBuffer &buffer PROTO_ENCODE_DEBUG_PARAM) {
-    return buffer.get_pos();
-  }
-  static uint32_t calc_size_msg(const void *self) { return 0; }
+  // Non-virtual defaults for messages with no fields.
+  // Concrete message classes hide these with their own implementations.
+  // All call sites use templates to preserve the concrete type, so virtual
+  // dispatch is not needed. This eliminates per-message vtable entries for
+  // encode/calculate_size, saving ~1.3 KB of flash across all message types.
  uint8_t *encode(ProtoWriteBuffer &buffer PROTO_ENCODE_DEBUG_PARAM) const { return buffer.get_pos(); }
  uint32_t calculate_size() const { return 0; }
 #ifdef HAS_PROTO_MESSAGE_DUMP
@@ -721,13 +648,7 @@ class ProtoMessage {
 // Base class for messages that support decoding
 class ProtoDecodableMessage : public ProtoMessage {
 public:
-  /// Stores one decoded field into \p msg; generated per message type. \p scalar is the varint or
-  /// fixed32 value, or the length of the length-delimited payload at \p data. An unknown field or
-  /// wrong wire type matches no case and is skipped.
-  using DecodeFieldFn = void (*)(void *msg, uint32_t tag, const uint8_t *data, proto_varint_value_t scalar);
-  /// Walk \p buffer and hand every field to \p field. The generated decode() passes the message's
-  /// own decode_field, so decodable messages carry no vtable.
-  static void decode_fields(void *msg, const uint8_t *buffer, size_t length, DecodeFieldFn field);
+  void decode(const uint8_t *buffer, size_t length);

  /**
   * Count occurrences of a repeated field in a protobuf buffer.
@@ -739,15 +660,14 @@ class ProtoDecodableMessage : public ProtoMessage {
   * @return Number of times the field appears in the buffer
   */
  static uint32_t count_repeated_field(const uint8_t *buffer, size_t length, uint32_t target_field_id);
-  // The destructor stays accessible on purpose: the generated messages are aggregates that brace
-  // initialise sub message members, which copies a base temporary. That trades away the compile time
-  // guard against deleting through this type; messages are stack locals and never owned through a base
-  // pointer. ProtoMessage keeps its guard for the dump builds.
+
+ protected:
+  ~ProtoDecodableMessage() = default;
+  virtual bool decode_varint(uint32_t field_id, proto_varint_value_t value) { return false; }
+  virtual bool decode_length(uint32_t field_id, ProtoLengthDelimited value) { return false; }
+  virtual bool decode_32bit(uint32_t field_id, Proto32Bit value) { return false; }
+  // NOTE: decode_64bit removed - wire type 1 not supported
 };
-#ifndef HAS_PROTO_MESSAGE_DUMP
-// decode() passes decode_field explicitly, so nothing here may add a vtable
-static_assert(!std::is_polymorphic_v<ProtoDecodableMessage>, "decodable messages carry no vtable");
-#endif

 class ProtoSize {
 public:
@@ -872,7 +792,7 @@ class ProtoSize {
   * @return The number of bytes needed to encode the field ID and wire type
   */
  static constexpr uint32_t field(uint32_t field_id, uint32_t type) {
-    uint32_t tag = proto_tag(field_id, type & WIRE_TYPE_MASK);
+    uint32_t tag = (field_id << 3) | (type & WIRE_TYPE_MASK);
    return varint(tag);
  }

@@ -956,14 +876,24 @@ class ProtoSize {

 // Implementation of methods that depend on ProtoSize being fully defined

+// Encode thunk — converts void* back to concrete type for direct encode() call
+template<typename T> uint8_t *proto_encode_msg(const void *msg, ProtoWriteBuffer &buf PROTO_ENCODE_DEBUG_PARAM) {
+  return static_cast<const T *>(msg)->encode(buf PROTO_ENCODE_DEBUG_ARG);
+}
+
 // Thin template wrapper; delegates to non-template core in proto.cpp.
 template<typename T> inline void ProtoWriteBuffer::encode_sub_message(uint32_t field_id, const T &value) {
-  this->encode_sub_message(field_id, &value, &T::encode_msg);
+  this->encode_sub_message(field_id, &value, &proto_encode_msg<T>);
 }

 // Thin template wrapper; delegates to non-template core.
 template<typename T> inline void ProtoWriteBuffer::encode_optional_sub_message(uint32_t field_id, const T &value) {
-  this->encode_optional_sub_message(field_id, T::calc_size_msg(&value), &value, &T::encode_msg);
+  this->encode_optional_sub_message(field_id, value.calculate_size(), &value, &proto_encode_msg<T>);
+}
+
+// Template decode_to_message - preserves concrete type so decode() resolves statically
+template<typename T> void ProtoLengthDelimited::decode_to_message(T &msg) const {
+  msg.decode(this->value_, this->length_);
 }

 template<typename T> const char *proto_enum_to_string(T value);
@@ -153,14 +153,13 @@ bool ES7210::configure_mic_gain_() {
  ES7210_ERROR_CHECK(this->es7210_update_reg_bit_(ES7210_MIC2_GAIN_REG44, 0x0f, regv));

  // Configure mic 3
-  // MIC3 uses the ADC3/4 and MIC3/4 clock domains (bits 2 and 4), not the MIC1/2 domains.
-  ES7210_ERROR_CHECK(this->es7210_update_reg_bit_(ES7210_CLOCK_OFF_REG01, 0x15, 0x00));
+  ES7210_ERROR_CHECK(this->es7210_update_reg_bit_(ES7210_CLOCK_OFF_REG01, 0x0b, 0x00));
  ES7210_ERROR_CHECK(this->write_byte(ES7210_MIC34_POWER_REG4C, 0x00));
  ES7210_ERROR_CHECK(this->es7210_update_reg_bit_(ES7210_MIC3_GAIN_REG45, 0x10, 0x10));
  ES7210_ERROR_CHECK(this->es7210_update_reg_bit_(ES7210_MIC3_GAIN_REG45, 0x0f, regv));

  // Configure mic 4
-  ES7210_ERROR_CHECK(this->es7210_update_reg_bit_(ES7210_CLOCK_OFF_REG01, 0x15, 0x00));
+  ES7210_ERROR_CHECK(this->es7210_update_reg_bit_(ES7210_CLOCK_OFF_REG01, 0x0b, 0x00));
  ES7210_ERROR_CHECK(this->write_byte(ES7210_MIC34_POWER_REG4C, 0x00));
  ES7210_ERROR_CHECK(this->es7210_update_reg_bit_(ES7210_MIC4_GAIN_REG46, 0x10, 0x10));
  ES7210_ERROR_CHECK(this->es7210_update_reg_bit_(ES7210_MIC4_GAIN_REG46, 0x0f, regv));
@@ -6,17 +6,12 @@ from esphome.components import esp32, network, psram, socket, wifi
 import esphome.config_validation as cv
 from esphome.const import (
    CONF_BUFFER_SIZE,
-    CONF_ESPHOME,
    CONF_FORMAT,
    CONF_HEIGHT,
    CONF_ID,
-    CONF_MODEL,
-    CONF_NAME,
-    CONF_PROJECT,
    CONF_SAMPLE_RATE,
    CONF_SOURCE,
    CONF_TASK_STACK_IN_PSRAM,
-    CONF_VERSION,
    CONF_WIDTH,
 )
 from esphome.core import CORE, ID
@@ -32,14 +27,6 @@ DOMAIN = "sendspin"
 CONF_DISPLAY_OFFSET = "display_offset"
 CONF_SENDSPIN_ID = "sendspin_id"

-CONF_FIRMWARE_VERSION = "firmware_version"
-CONF_MANUFACTURER = "manufacturer"
-
-# An empty device information string would be sent to the server as an empty value rather than
-# falling back, so reject it instead of silently substituting the fallback. The 127 byte cap keeps
-# the length prefix of a protobuf string field to a single byte, matching `esphome: project:`.
-DEVICE_INFO_STRING = cv.All(cv.string_strict, cv.Length(min=1), cv.ByteLength(max=127))
-
 CONF_INITIAL_STATIC_DELAY = "initial_static_delay"
 CONF_FIXED_DELAY = "fixed_delay"
 CONF_DECODE_MEMORY = "decode_memory"
@@ -211,9 +198,6 @@ CONFIG_SCHEMA = cv.All(
        {
            cv.GenerateID(): cv.declare_id(SendspinHub),
            cv.Optional(CONF_TASK_STACK_IN_PSRAM): psram.validate_task_stack_in_psram,
-            cv.Optional(CONF_MANUFACTURER): DEVICE_INFO_STRING,
-            cv.Optional(CONF_MODEL): DEVICE_INFO_STRING,
-            cv.Optional(CONF_FIRMWARE_VERSION): DEVICE_INFO_STRING,
        }
    ),
    cv.only_on_esp32,
@@ -264,22 +248,6 @@ async def to_code(config: ConfigType) -> None:
        cg.add(var.set_task_stack_in_psram(True))
        psram.request_external_task_stack()

-    # Device information for the server's client/hello message. Falls back to the project
-    # information, which is written as `manufacturer.model`. Anything still unset keeps the
-    # default the hub itself applies: the ESPHome name and version.
-    project = CORE.config[CONF_ESPHOME].get(CONF_PROJECT, {})
-    project_manufacturer, _, project_model = project.get(CONF_NAME, "").partition(".")
-    for value, setter in (
-        (config.get(CONF_MANUFACTURER) or project_manufacturer, var.set_manufacturer),
-        (config.get(CONF_MODEL) or project_model, var.set_model),
-        (
-            config.get(CONF_FIRMWARE_VERSION) or project.get(CONF_VERSION),
-            var.set_firmware_version,
-        ),
-    ):
-        if value:
-            cg.add(setter(value))
-
    # sendspin-cpp library
    esp32.add_idf_component(name="sendspin/sendspin-cpp", ref="0.7.2")

@@ -76,12 +76,8 @@ void SendspinHub::dump_config() {
  ESP_LOGCONFIG(TAG,
                "Sendspin Hub:\n"
                "  Client ID: %s\n"
-                "  Manufacturer: %s\n"
-                "  Model: %s\n"
-                "  Firmware version: %s\n"
                "  Task stack in PSRAM: %s",
-                get_client_id_into_buffer(mac_buf), this->manufacturer_, this->get_product_name_(),
-                this->firmware_version_, YESNO(this->task_stack_in_psram_));
+                get_client_id_into_buffer(mac_buf), YESNO(this->task_stack_in_psram_));

 #ifdef USE_SENDSPIN_ARTWORK
  // Slot indices come from the order the image platform entries were declared, so the log is the
@@ -131,19 +127,15 @@ const char *SendspinHub::get_client_id_into_buffer(std::span<char, MAC_ADDRESS_P
  return get_mac_address_pretty_into_buffer(buf);
 }

-const char *SendspinHub::get_product_name_() const {
-  return this->model_ != nullptr ? this->model_ : App.get_name().c_str();
-}
-
 sendspin::SendspinClientConfig SendspinHub::build_client_config_() {
  sendspin::SendspinClientConfig config;

  char mac_buf[MAC_ADDRESS_PRETTY_BUFFER_SIZE];
  config.client_id = SendspinHub::get_client_id_into_buffer(mac_buf);
  config.name = App.get_friendly_name();
-  config.product_name = this->get_product_name_();
-  config.manufacturer = this->manufacturer_;
-  config.software_version = this->firmware_version_;
+  config.product_name = App.get_name();
+  config.manufacturer = "ESPHome";
+  config.software_version = ESPHOME_VERSION;
  config.httpd_psram_stack = this->task_stack_in_psram_;

  return config;
@@ -8,7 +8,6 @@
 #include "esphome/core/component.h"
 #include "esphome/core/helpers.h"
 #include "esphome/core/preferences.h"
-#include "esphome/core/version.h"

 #include <sendspin/client.h>
 #include <sendspin/config.h>
@@ -126,15 +125,6 @@ class SendspinHub final : public Component,

  void set_task_stack_in_psram(bool task_stack_in_psram) { this->task_stack_in_psram_ = task_stack_in_psram; }

-  /// @brief Sets the device information reported to the server in the `client/hello` message.
-  ///
-  /// Each takes a pointer to a string literal emitted by codegen, so it must stay valid for the
-  /// lifetime of the hub. Only called for values the configuration overrides; anything left alone
-  /// keeps the default described on the member below.
-  void set_manufacturer(const char *manufacturer) { this->manufacturer_ = manufacturer; }
-  void set_model(const char *model) { this->model_ = model; }
-  void set_firmware_version(const char *firmware_version) { this->firmware_version_ = firmware_version; }
-
  // --- Sendspin role specific methods ---

 #ifdef USE_SENDSPIN_ARTWORK
@@ -197,9 +187,6 @@ class SendspinHub final : public Component,
  /// @brief Builds the SendspinClientConfig from ESPHome configuration and platform info.
  sendspin::SendspinClientConfig build_client_config_();

-  /// @brief Returns the product name reported to the server: the configured model, or the device name.
-  const char *get_product_name_() const;
-
  /// @brief Writes the active network interface's MAC into @p buf and returns its data pointer.
  /// Uses the ethernet MAC if ethernet is configured, otherwise the base MAC (used by wifi).
  static const char *get_client_id_into_buffer(std::span<char, MAC_ADDRESS_PRETTY_BUFFER_SIZE> buf);
@@ -281,12 +268,6 @@ class SendspinHub final : public Component,
  CallbackManager<void(const sendspin::GroupUpdateObject &)> group_update_callbacks_{};

  bool task_stack_in_psram_{false};
-
-  // Device information sent in the `client/hello` message. Defaults apply when neither the
-  // sendspin configuration nor the project information supplies a value.
-  const char *manufacturer_{"ESPHome"};
-  const char *model_{nullptr};  // nullptr reports the device name instead
-  const char *firmware_version_{ESPHOME_VERSION};
 };

 /// @brief Base class for all sendspin subcomponents.
@@ -30,7 +30,6 @@ MULTI_CONF = True

 serial_proxy_ns = cg.esphome_ns.namespace("serial_proxy")
 SerialProxy = serial_proxy_ns.class_("SerialProxy", cg.Component, uart.UARTDevice)
-SerialProxyTap = serial_proxy_ns.class_("SerialProxyTap")

 api_enums_ns = cg.esphome_ns.namespace("api").namespace("enums")
 SerialProxyPortType = api_enums_ns.enum("SerialProxyPortType")
@@ -29,57 +29,26 @@ void SerialProxy::setup() {
 #ifdef USE_API
  // instance_index_ is fixed at registration time; pre-set it so loop() only needs to update data
  this->outgoing_msg_.instance = this->instance_index_;
-#endif
-#ifdef USE_SERIAL_PROXY_TAP
-  // A tap sets itself up before this runs (its setup priority is higher), so it may
-  // already be waiting on the port -- a boot-time handshake with the device, say. Leaving
-  // the loop enabled is what lets that finish; without it the tap would stall until a
-  // client happened to subscribe.
-  if (this->tap_ != nullptr && this->tap_->tap_needs_port()) {
-    return;
-  }
 #endif
  // No subscriber at startup; disable loop until a client subscribes
  this->disable_loop();
 }

-#ifdef USE_SERIAL_PROXY_TAP
-void SerialProxy::reset_mode_() {
-  // The mode belongs to a session, not to the port. Carrying a departed client's choice
-  // over to the next one would inject protocol bytes into a stream that never asked for
-  // them -- a firmware upload, or any client built before this request existed and so
-  // unable to turn it off. Guessing RAW is the safe direction: a client that wanted
-  // protocol handling and did not ask for it merely sends its own acknowledgements.
-  if (this->mode_ == api::enums::SERIAL_PROXY_MODE_RAW) {
-    return;
-  }
-  ESP_LOGD(TAG, "Session ended, returning serial proxy [%" PRIu32 "] to RAW mode", this->instance_index_);
-  this->mode_ = api::enums::SERIAL_PROXY_MODE_RAW;
-}
-#endif
-
 void SerialProxy::loop() {
 #ifdef USE_API
-  // Detect subscriber disconnect
-  if (this->api_connection_ != nullptr && (this->api_connection_->is_marked_for_removal() ||
-                                           !this->api_connection_->is_connection_setup() || !api_is_connected())) {
-    ESP_LOGW(TAG, "Subscriber disconnected");
-    this->api_connection_ = nullptr;
-    this->reset_mode_();
-  }
-
-  // With no subscriber there is normally nothing to do, but a tap may still need the port
-  // read -- it does its protocol work precisely while nobody else is listening.
+  // Safety check — loop should only run when subscribed, but guard against races
  if (this->api_connection_ == nullptr) [[unlikely]] {
-#ifdef USE_SERIAL_PROXY_TAP
-    if (this->tap_ == nullptr || !this->tap_->tap_needs_port()) {
-      this->disable_loop();
-      return;
-    }
-#else
    this->disable_loop();
    return;
-#endif
+  }
+
+  // Detect subscriber disconnect
+  if (this->api_connection_->is_marked_for_removal() || !this->api_connection_->is_connection_setup() ||
+      !api_is_connected()) {
+    ESP_LOGW(TAG, "Subscriber disconnected");
+    this->api_connection_ = nullptr;
+    this->disable_loop();
+    return;
  }

  // Read available data from UART and forward to subscribed client
@@ -100,54 +69,11 @@ void __attribute__((noinline)) SerialProxy::read_and_send_(size_t available) {
  if (!this->read_array(buffer, to_read))
    return;

-#ifdef USE_SERIAL_PROXY_TAP
-  // Before forwarding, so a tap that answers the device (an acknowledgement, say) is not
-  // waiting on the network round trip to a subscriber that may not even exist.
-  if (this->tap_observing_()) {
-    this->tap_->on_device_rx(buffer, to_read);
-  }
-#endif
-
-  if (this->api_connection_ == nullptr) {
-    return;
-  }
  this->outgoing_msg_.set_data(buffer, to_read);
  this->api_connection_->send_serial_proxy_data(this->outgoing_msg_);
 }
 #endif

-#ifdef USE_SERIAL_PROXY_TAP
-
-bool SerialProxy::tap_observing_() const {
-  if (this->tap_ == nullptr) {
-    return false;
-  }
-  // With no subscriber, a tap doing its own protocol work (the boot-time handshake with
-  // the device, say) is served regardless of mode -- nobody has chosen one yet. Once a
-  // subscriber holds the port, the mode alone decides, so RAW stays inert.
-  if (this->api_connection_ == nullptr && this->tap_->tap_needs_port()) {
-    return true;
-  }
-  // Otherwise the mode decides. RAW must be inert: a client that flips to RAW before
-  // flashing firmware is entitled to a byte pipe with nothing injecting protocol bytes
-  // into it, and "the tap turned out not to recognise the stream" is not good enough.
-  return this->mode_ == api::enums::SERIAL_PROXY_MODE_PROTOCOL;
-}
-
-void SerialProxy::tap_pump() {
-#ifdef USE_API
-  // Nothing would consume the bytes; leave them in the FIFO
-  if (!this->tap_observing_() && this->api_connection_ == nullptr) {
-    return;
-  }
-  const size_t available = this->available();
-  if (available > 0) {
-    this->read_and_send_(available);
-  }
-#endif
-}
-#endif
-
 void SerialProxy::dump_config() {
  ESP_LOGCONFIG(TAG,
                "Serial Proxy [%" PRIu32 "]:\n"
@@ -166,9 +92,8 @@ void SerialProxy::dump_config() {
 SerialProxyResult SerialProxy::configure(api::APIConnection *api_connection, uint32_t baudrate, bool flow_control,
                                         uint8_t parity, uint8_t stop_bits, uint8_t data_size) {
 #ifdef USE_API
-  if (!this->is_subscriber_(api_connection)) {
-    ESP_LOGW(TAG, "Ignoring configure request from client without port subscription [%" PRIu32 "]",
-             this->instance_index_);
+  if (this->port_claimed_by_other_(api_connection)) {
+    ESP_LOGW(TAG, "Ignoring configure request from client without port access [%" PRIu32 "]", this->instance_index_);
    return SerialProxyResult::SERIAL_PROXY_RESULT_PORT_IN_USE;
  }
 #endif
@@ -234,80 +159,24 @@ SerialProxyResult SerialProxy::configure(api::APIConnection *api_connection, uin
  return SerialProxyResult::SERIAL_PROXY_RESULT_OK;
 }

-SerialProxyResult SerialProxy::set_mode_from_client(api::APIConnection *api_connection,
-                                                    api::enums::SerialProxyMode mode) {
-#ifdef USE_API
-  // Only the live subscriber may change the mode, so the mode cannot outlive a session
-  if (!this->is_subscriber_(api_connection)) {
-    ESP_LOGW(TAG, "Ignoring mode request from client without port subscription [%" PRIu32 "]", this->instance_index_);
-    return SerialProxyResult::SERIAL_PROXY_RESULT_PORT_IN_USE;
-  }
-#endif
-  // Values come from a remote client
-  if (mode != api::enums::SERIAL_PROXY_MODE_RAW && mode != api::enums::SERIAL_PROXY_MODE_PROTOCOL) {
-    ESP_LOGW(TAG, "Invalid mode: %" PRIu32, static_cast<uint32_t>(mode));
-    return SerialProxyResult::SERIAL_PROXY_RESULT_INVALID_ARGUMENT;
-  }
-  // PROTOCOL on a port with no tap would be a silent no-op; refuse so the client knows
-#ifdef USE_SERIAL_PROXY_TAP
-  const bool has_tap = this->tap_ != nullptr;
-#else
-  const bool has_tap = false;
-#endif
-  if (mode == api::enums::SERIAL_PROXY_MODE_PROTOCOL && !has_tap) {
-    ESP_LOGW(TAG, "No tap on serial proxy [%" PRIu32 "]; PROTOCOL mode unavailable", this->instance_index_);
-    return SerialProxyResult::SERIAL_PROXY_RESULT_NOT_SUPPORTED;
-  }
-  ESP_LOGD(TAG, "Serial proxy [%" PRIu32 "] mode set to %s", this->instance_index_,
-           mode == api::enums::SERIAL_PROXY_MODE_PROTOCOL ? LOG_STR_LITERAL("PROTOCOL") : LOG_STR_LITERAL("RAW"));
-#ifdef USE_SERIAL_PROXY_TAP
-  const bool leaving_protocol_mode =
-      this->mode_ != api::enums::SERIAL_PROXY_MODE_RAW && mode == api::enums::SERIAL_PROXY_MODE_RAW;
-  this->mode_ = mode;
-
-  // Only for an explicit client request, not for reset_mode_() at the end of a session:
-  // an ordinary disconnect says nothing about the device, whereas a client deliberately
-  // asking for raw bytes usually precedes changing what the device is.
-  if (leaving_protocol_mode && this->tap_ != nullptr) {
-    this->tap_->on_protocol_disabled();
-  }
-#endif
-  return SerialProxyResult::SERIAL_PROXY_RESULT_OK;
-}
-
 void SerialProxy::write_from_client(api::APIConnection *api_connection, const uint8_t *data, size_t len) {
 #ifdef USE_API
-  // Bytes from anyone but the live subscriber would interleave with the subscriber's
-  // traffic -- or with an active tap's -- on the wire
-  if (!this->is_subscriber_(api_connection)) {
-    if (this->api_connection_ != nullptr) {
-      ESP_LOGW(TAG, "Ignoring write from client that does not hold serial proxy [%" PRIu32 "]", this->instance_index_);
-    } else {
-      // A legacy client streaming writes without subscribing would flood WARN, one per
-      // request; writes are the only high-rate, unacknowledged operation, so keep this
-      // visible without drowning the log
-      ESP_LOGV(TAG, "Ignoring write from client without port subscription [%" PRIu32 "]", this->instance_index_);
-    }
+  // Bytes from a client other than the live subscriber would interleave with the
+  // subscriber's traffic on the wire
+  if (this->port_claimed_by_other_(api_connection)) {
+    ESP_LOGW(TAG, "Ignoring write from client without port access [%" PRIu32 "]", this->instance_index_);
    return;
  }
 #endif
  if (data == nullptr || len == 0)
    return;
  this->write_array(data, len);
-
-#ifdef USE_SERIAL_PROXY_TAP
-  // After the write, so the tap observes the same ordering the device does
-  if (this->tap_observing_()) {
-    this->tap_->on_client_tx(data, len);
-  }
-#endif
 }

 SerialProxyResult SerialProxy::set_modem_pins(api::APIConnection *api_connection, uint32_t line_states) {
 #ifdef USE_API
-  if (!this->is_subscriber_(api_connection)) {
-    ESP_LOGW(TAG, "Ignoring modem pin request from client without port subscription [%" PRIu32 "]",
-             this->instance_index_);
+  if (this->port_claimed_by_other_(api_connection)) {
+    ESP_LOGW(TAG, "Ignoring modem pin request from client without port access [%" PRIu32 "]", this->instance_index_);
    return SerialProxyResult::SERIAL_PROXY_RESULT_PORT_IN_USE;
  }
 #endif
@@ -341,8 +210,8 @@ uint32_t SerialProxy::get_modem_pins() const {
 SerialProxyResult SerialProxy::flush_port(api::APIConnection *api_connection) {
 #ifdef USE_API
  // Flushing stalls the port, so it gets the same ownership check as writes
-  if (!this->is_subscriber_(api_connection)) {
-    ESP_LOGW(TAG, "Ignoring flush from client without port subscription [%" PRIu32 "]", this->instance_index_);
+  if (this->port_claimed_by_other_(api_connection)) {
+    ESP_LOGW(TAG, "Ignoring flush from client without port access [%" PRIu32 "]", this->instance_index_);
    return SerialProxyResult::SERIAL_PROXY_RESULT_PORT_IN_USE;
  }
 #endif
@@ -361,6 +230,11 @@ SerialProxyResult SerialProxy::flush_port(api::APIConnection *api_connection) {
 }

 #ifdef USE_API
+bool SerialProxy::port_claimed_by_other_(api::APIConnection *api_connection) const {
+  return this->api_connection_ != nullptr && this->api_connection_ != api_connection &&
+         this->api_connection_->is_connection_setup();
+}
+
 SerialProxyResult SerialProxy::serial_proxy_request(api::APIConnection *api_connection,
                                                    api::enums::SerialProxyRequestType type) {
  switch (type) {
@@ -378,10 +252,6 @@ SerialProxyResult SerialProxy::serial_proxy_request(api::APIConnection *api_conn
          return SerialProxyResult::SERIAL_PROXY_RESULT_PORT_IN_USE;
        }
        ESP_LOGW(TAG, "Previous subscriber disconnected; taking over subscription");
-        // End the dead client's session before starting the new one, so its mode
-        // cannot leak into a session that never asked for it
-        this->api_connection_ = nullptr;
-        this->reset_mode_();
      }
      this->api_connection_ = api_connection;
      this->enable_loop();
@@ -394,15 +264,7 @@ SerialProxyResult SerialProxy::serial_proxy_request(api::APIConnection *api_conn
        return SerialProxyResult::SERIAL_PROXY_RESULT_OK;
      }
      this->api_connection_ = nullptr;
-      this->reset_mode_();
-#ifdef USE_SERIAL_PROXY_TAP
-      // Keep the loop alive for a tap that still needs the port (mirrors loop())
-      if (this->tap_ == nullptr || !this->tap_->tap_needs_port()) {
-        this->disable_loop();
-      }
-#else
      this->disable_loop();
-#endif
      ESP_LOGV(TAG, "API connection unsubscribed from serial proxy [%" PRIu32 "]", this->instance_index_);
      return SerialProxyResult::SERIAL_PROXY_RESULT_OK;
    default:
@@ -26,7 +26,6 @@ class APIConnection;
 namespace enums {
 enum SerialProxyPortType : uint32_t;
 enum SerialProxyRequestType : uint32_t;
-enum SerialProxyMode : uint32_t;
 }  // namespace enums
 }  // namespace esphome::api

@@ -53,36 +52,6 @@ enum class SerialProxyResult : uint8_t {
 /// Maximum bytes to read from UART in a single loop iteration
 inline constexpr size_t SERIAL_PROXY_MAX_READ_SIZE = 256;

-#ifdef USE_SERIAL_PROXY_TAP
-/// Observes a port's traffic without owning it, and may inject bytes of its own.
-///
-/// This exists so protocol-aware behaviour can be layered onto a plain byte pipe without
-/// the pipe knowing anything about the protocol: the tap is compiled in only when some
-/// component asks for one, so a proxy carrying an RS485 meter pays nothing for it.
-///
-/// A tap is an observer, never a gatekeeper -- it cannot suppress or alter the bytes
-/// flowing in either direction, so a misbehaving tap cannot corrupt the stream.
-class SerialProxyTap {
- public:
-  /// Bytes read from the device, before they are forwarded to any subscriber.
-  virtual void on_device_rx(const uint8_t *data, size_t len) = 0;
-
-  /// Bytes a subscriber sent towards the device, after they have been written.
-  virtual void on_client_tx(const uint8_t *data, size_t len) = 0;
-
-  /// True when the port must keep reading even with no subscriber attached, so a tap can
-  /// do its own protocol work while nobody is listening. Honoured only while no
-  /// subscriber holds the port; with one attached, the port mode alone decides.
-  virtual bool tap_needs_port() const = 0;
-
-  /// A client explicitly turned protocol handling off for this port. Distinct from the
-  /// automatic reset when a session ends: this one means a client intends to do something
-  /// else with the device -- reflash it, most likely -- so anything the tap believes about
-  /// it should be treated as suspect.
-  virtual void on_protocol_disabled() = 0;
-};
-#endif
-
 class SerialProxy final : public uart::UARTDevice, public Component {
 public:
  void setup() override;
@@ -108,9 +77,6 @@ class SerialProxy final : public uart::UARTDevice, public Component {
  /// Get the port type
  api::enums::SerialProxyPortType get_port_type() const { return this->port_type_; }

-  /// Handle a mode change requested by an API client
-  SerialProxyResult set_mode_from_client(api::APIConnection *api_connection, api::enums::SerialProxyMode mode);
-
  /// Configure UART parameters and apply them
  /// @param api_connection The API connection requesting the change
  /// @param baudrate Baud rate in bits per second
@@ -155,67 +121,13 @@ class SerialProxy final : public uart::UARTDevice, public Component {
  /// Set the DTR GPIO pin (from YAML configuration)
  void set_dtr_pin(GPIOPin *pin) { this->dtr_pin_ = pin; }

-#ifdef USE_SERIAL_PROXY_TAP
-  /// Attach a traffic observer. At most one, set once at setup time.
-  void set_tap(SerialProxyTap *tap) { this->tap_ = tap; }
-
-  /// Write bytes originating from the tap rather than from a client. Bypasses the
-  /// subscriber ownership check, but only while the tap is being served bytes -- so a
-  /// port in RAW mode with a subscriber attached stays inert. Returns false when the
-  /// bytes were dropped for that reason.
-  bool write_from_tap(const uint8_t *data, size_t len) {
-    if (!this->tap_observing_()) {
-      return false;
-    }
-    this->write_array(data, len);
-    return true;
-  }
-
-  /// Whether the tap is currently being served bytes. Can flip false with no callback
-  /// (a subscriber attaching in RAW mode, say), so a tap should check before starting
-  /// protocol work and when a reply seems overdue.
-  bool tap_is_observed() const { return this->tap_observing_(); }
-
-  /// Resume reading after a tap's needs change. loop() disables itself when there is
-  /// neither a subscriber nor a tap that wants the port, so a tap starting fresh work
-  /// must ask for it back. Must be called from the main loop.
-  void tap_request_port() { this->enable_loop(); }
-
-  /// Whether the underlying device is present. On a USB UART this tracks enumeration, so
-  /// a tap can notice the device being unplugged and plugged back in.
-  bool is_device_connected() const { return this->parent_->is_connected(); }
-
-  /// Run one read-and-dispatch cycle immediately. Lets a tap make progress before the
-  /// main loop is running -- during setup, for instance, while a component is still
-  /// blocking on can_proceed(). Must not be called from on_device_rx() or
-  /// on_client_tx(): each nested cycle costs a 256-byte stack frame.
-  void tap_pump();
-#endif
-
 protected:
 #ifdef USE_API
-  /// Read from UART, hand the bytes to any tap, and forward them to a subscriber
-  /// (slow path with a 256-byte stack buffer)
+  /// Read from UART and send to API client (slow path with 256-byte stack buffer)
  void read_and_send_(size_t available);

-  /// True when the given connection is the live subscriber. Every port operation
-  /// (write, configure, modem pins, flush, mode) requires this, so an unsubscribed
-  /// client can never share the wire with the subscriber or an active tap.
-  bool is_subscriber_(api::APIConnection *api_connection) const { return this->api_connection_ == api_connection; }
-#endif
-
-#ifdef USE_SERIAL_PROXY_TAP
-  /// Return the port to RAW when a subscriber goes away, so the mode never outlives it
-  void reset_mode_();
-#else
-  /// Without a tap, PROTOCOL is refused, so the mode is fixed at RAW and there is
-  /// nothing to reset
-  void reset_mode_() {}
-#endif
-
-#ifdef USE_SERIAL_PROXY_TAP
-  /// True when the tap should be shown the traffic passing through this port
-  bool tap_observing_() const;
+  /// True when a live subscriber other than the given connection holds the port
+  bool port_claimed_by_other_(api::APIConnection *api_connection) const;
 #endif

  /// Instance index for identifying this proxy in API messages
@@ -235,11 +147,6 @@ class SerialProxy final : public uart::UARTDevice, public Component {
  /// Port type
  api::enums::SerialProxyPortType port_type_{};

-#ifdef USE_SERIAL_PROXY_TAP
-  /// How the bytes passing through are treated; zero is SERIAL_PROXY_MODE_RAW
-  api::enums::SerialProxyMode mode_{};
-#endif
-
  /// Optional GPIO pins for modem control
  GPIOPin *rts_pin_{nullptr};
  GPIOPin *dtr_pin_{nullptr};
@@ -247,10 +154,6 @@ class SerialProxy final : public uart::UARTDevice, public Component {
  /// Current modem pin states
  bool rts_state_{false};
  bool dtr_state_{false};
-
-#ifdef USE_SERIAL_PROXY_TAP
-  SerialProxyTap *tap_{nullptr};
-#endif
 };

 }  // namespace esphome::serial_proxy
@@ -181,7 +181,6 @@
 #define USE_SENSOR
 #define USE_SENSOR_FILTER
 #define USE_SERIAL_PROXY
-#define USE_SERIAL_PROXY_TAP
 #define USE_SETUP_PRIORITY_OVERRIDE
 #define USE_STATUS_LED
 #define USE_STATUS_SENSOR
@@ -22,10 +22,6 @@ namespace esphome {
 * pointer.  When it is default constructed, it has empty string.  You can freely copy or move around this struct, but
 * never free its pointer.  str() function can be used to export the content as std::string. StringRef is adopted from
 * <https://github.com/nghttp2/nghttp2/blob/29cbf8b83ff78faf405d1086b16adc09a8772eca/src/template.h#L376>
- *
- * A StringRef may carry a null pointer while its length is zero (the generated api messages start their encode only
- * string fields that way). Every member treats that as the empty string; only c_str() hands the null pointer on, so
- * callers that print or copy through c_str() must check empty() first.
 */
 class StringRef {
 public:
@@ -82,7 +78,7 @@ class StringRef {

  /// True if the view begins with the given prefix (std::string::starts_with-like)
  bool starts_with(const StringRef &prefix) const {
-    return len_ >= prefix.len_ && (prefix.len_ == 0 || std::memcmp(base_, prefix.base_, prefix.len_) == 0);
+    return len_ >= prefix.len_ && std::memcmp(base_, prefix.base_, prefix.len_) == 0;
  }
  bool starts_with(const char *prefix) const { return this->starts_with(StringRef(prefix)); }
  bool starts_with(const std::string &prefix) const { return this->starts_with(StringRef(prefix)); }
@@ -96,15 +92,14 @@ class StringRef {
    return actual;
  }

-  std::string str() const { return std::string(base_, len_); }  // fine for {nullptr, 0}: nothing is read
+  std::string str() const { return std::string(base_, len_); }
  const uint8_t *byte() const { return reinterpret_cast<const uint8_t *>(base_); }

  operator std::string() const { return str(); }

  /// Compare (compatible with std::string::compare)
  int compare(const StringRef &other) const {
-    size_type common = std::min(len_, other.len_);
-    int result = common == 0 ? 0 : std::memcmp(base_, other.base_, common);
+    int result = std::memcmp(base_, other.base_, std::min(len_, other.len_));
    if (result != 0)
      return result;
    if (len_ < other.len_)
@@ -263,14 +258,7 @@ inline double stod(const StringRef &str, size_t *pos = nullptr) {

 #ifdef USE_JSON
 // NOLINTNEXTLINE(readability-identifier-naming)
-inline void convertToJson(const StringRef &src, JsonVariant dst) {
-  // Bounded by the view length; a null, empty view becomes "" rather than JSON null
-  if (src.empty()) {
-    dst.set("");
-    return;
-  }
-  dst.set(JsonString(src.c_str(), src.size()));
-}
+inline void convertToJson(const StringRef &src, JsonVariant dst) { dst.set(src.c_str()); }
 #endif  // USE_JSON

 }  // namespace esphome
@@ -9,7 +9,7 @@ colorama==0.4.6
 tzlocal==5.4.4    # from time
 tzdata>=2026.3  # from time
 pyserial==3.5
-platformio==6.1.19
+platformio==6.2.0
 esptool==5.4.0
 click==8.3.3
 aioesphomeapi==46.4.0
@@ -28,11 +28,6 @@ class WireType(IntEnum):
    END_GROUP = 4  # groups (deprecated)
    FIXED32 = 5  # fixed32, sfixed32, float

-    @property
-    def cpp_name(self) -> str:
-        """The matching constant in proto.h."""
-        return f"WIRE_TYPE_{self.name}"
-

 # Generate with
 # protoc --python_out=script/api_protobuf -I esphome/components/api/ api_options.proto
@@ -131,10 +126,9 @@ def camel_to_snake(name: str) -> str:
    return re.sub("([a-z0-9])([A-Z])", r"\1_\2", s1).lower()


-def _encode_call(func: str, *args: str, force: bool = False) -> str:
-    """Emit one ProtoEncode call; every helper takes the cursor and returns it advanced."""
-    suffix = "_force" if force else ""
-    return f"pos = ProtoEncode::{func}{suffix}({', '.join(('pos', *args))});"
+def force_str(force: bool) -> str:
+    """Convert a boolean force value to string format for C++ code."""
+    return str(force).lower()


 class TypeInfo(ABC):
@@ -229,39 +223,55 @@ class TypeInfo(ABC):
    def class_member(self) -> str:
        return f"{self.cpp_type} {self.field_name}{{{self.default_value}}};"

-    def decode_case(self, body: str) -> str:
-        """Emit one decode_field() case, keyed on the field's wire tag."""
-        return f"case proto_tag({self.number}, {self.wire_type.cpp_name}):\n" + indent(
-            f"{body}\nbreak;"
-        )
+    @property
+    def decode_varint_content(self) -> str:
+        content = self.decode_varint
+        if content is None:
+            return None
+        return f"case {self.number}: this->{self.field_name} = {content}; break;"

-    # Expression that reads this field from `value`; None when the type is never decoded.
-    decode_expr: str | None = None
-
-    def _decode_store(self, expr: str) -> str:
-        return f"this->{self.field_name} = {expr};"
+    decode_varint = None

    @property
-    def decode_content(self) -> str | None:
-        """The decode_field() case for this field, or None when it is never decoded."""
-        expr = self.decode_expr
-        return None if expr is None else self.decode_case(self._decode_store(expr))
+    def decode_length_content(self) -> str:
+        content = self.decode_length
+        if content is None:
+            return None
+        return f"case {self.number}: this->{self.field_name} = {content}; break;"
+
+    decode_length = None
+
+    @property
+    def decode_32bit_content(self) -> str:
+        content = self.decode_32bit
+        if content is None:
+            return None
+        return f"case {self.number}: this->{self.field_name} = {content}; break;"
+
+    decode_32bit = None
+
+    @property
+    def decode_64bit_content(self) -> str:
+        content = self.decode_64bit
+        if content is None:
+            return None
+        return f"case {self.number}: this->{self.field_name} = {content}; break;"
+
+    decode_64bit = None

    # Mapping from encode_func to raw encode expression template.
    # When a forced field has a single-byte tag, the code generator emits
    # write_raw_byte(tag) + raw encode instead of the full encode_* method,
    # eliminating the zero-check branch and encode_field_raw indirection.
    # {value} is replaced with the actual field expression.
-    RAW_ENCODE_MAP: dict[str, tuple[str, str]] = {
-        "encode_uint32": ("encode_varint_raw", "{value}"),
-        "encode_uint64": ("encode_varint_raw_64", "{value}"),
-        "encode_sint32": ("encode_varint_raw_short", "encode_zigzag32({value})"),
-        "encode_sint64": ("encode_varint_raw_64", "encode_zigzag64({value})"),
-        "encode_int64": ("encode_varint_raw_64", "static_cast<uint64_t>({value})"),
-        "encode_bool": ("write_raw_byte", "{value} ? 0x01 : 0x00"),
+    RAW_ENCODE_MAP: dict[str, str] = {
+        "encode_uint32": "ProtoEncode::encode_varint_raw(pos, {value});",
+        "encode_uint64": "ProtoEncode::encode_varint_raw_64(pos, {value});",
+        "encode_sint32": "ProtoEncode::encode_varint_raw_short(pos, encode_zigzag32({value}));",
+        "encode_sint64": "ProtoEncode::encode_varint_raw_64(pos, encode_zigzag64({value}));",
+        "encode_int64": "ProtoEncode::encode_varint_raw_64(pos, static_cast<uint64_t>({value}));",
+        "encode_bool": "ProtoEncode::write_raw_byte(pos, {value} ? 0x01 : 0x00);",
    }
-    # Fixed32 value expression for the shared tag+fixed32 writer; None for other wire types
-    fixed32_value_template: str | None = None

    def _encode_with_precomputed_tag(self, value_expr: str) -> str | None:
        """Try to emit a precomputed-tag encode for a field.
@@ -278,17 +288,12 @@ class TypeInfo(ABC):
            return None
        max_val = self.max_value
        # Only use RAW_ENCODE_MAP for forced fields or fields with max_value
-        raw = None
+        raw_expr = None
        if self.force or max_val is not None:
-            raw = self.RAW_ENCODE_MAP.get(self.encode_func)
-        if raw is None:
+            raw_expr = self.RAW_ENCODE_MAP.get(self.encode_func)
+        if raw_expr is None:
            return None
-        func, arg = raw
-        body = (
-            _encode_call("write_raw_byte", str(tag))
-            + "\n"
-            + _encode_call(func, arg.format(value=value_expr))
-        )
+        body = f"ProtoEncode::write_raw_byte(pos, {tag});\n{raw_expr.format(value=value_expr)}"
        if self.force:
            return body
        # Non-forced with max_value: inline zero-check + raw encode
@@ -309,44 +314,23 @@ class TypeInfo(ABC):
            return None
        # When max_len < 128, length varint is always 1 byte
        len_encode = (
-            _encode_call("write_raw_byte", f"static_cast<uint8_t>({len_expr})")
+            f"ProtoEncode::write_raw_byte(pos, static_cast<uint8_t>({len_expr}));"
            if max_len is not None and max_len < 128
-            else _encode_call("encode_varint_raw", len_expr)
+            else f"ProtoEncode::encode_varint_raw(pos, {len_expr});"
        )
-        return "\n".join(
-            (
-                _encode_call("write_raw_byte", str(tag)),
-                len_encode,
-                _encode_call("encode_raw", data_expr, len_expr),
-            )
-        )
-
-    def _encode_fixed32_with_precomputed_tag(self, value: str) -> str | None:
-        """Single-byte tag fixed32 write, or None for other types and multi-byte tags."""
-        tag = self.calculate_tag()
-        if self.fixed32_value_template is None or tag >= 128:
-            return None
-        value_expr = self.fixed32_value_template.format(value=value)
-        if self.force:
-            return _encode_call("write_tag_and_fixed32", str(tag), value_expr)
        return (
-            f"if (uint32_t raw = {value_expr}; raw != 0) [[likely]] {{\n"
-            f"  {_encode_call('write_tag_and_fixed32', str(tag), 'raw')}\n"
-            "}"
+            f"ProtoEncode::write_raw_byte(pos, {tag});\n"
+            f"{len_encode}\n"
+            f"ProtoEncode::encode_raw(pos, {data_expr}, {len_expr});"
        )

    @property
    def encode_content(self) -> str:
-        value = f"this->{self.field_name}"
-        if result := self._encode_with_precomputed_tag(value):
+        if result := self._encode_with_precomputed_tag(f"this->{self.field_name}"):
            return result
-        if result := self._encode_fixed32_with_precomputed_tag(value):
-            return result
-        return _encode_call(self.encode_func, str(self.number), value, force=self.force)
-
-    def encode_element(self, number: int, element: str) -> str:
-        """Encode one element of a repeated field; elements are always written."""
-        return _encode_call(self.encode_func, str(number), element, force=True)
+        if self.force:
+            return f"ProtoEncode::{self.encode_func}(pos, {self.number}, this->{self.field_name}, true);"
+        return f"ProtoEncode::{self.encode_func}(pos, {self.number}, this->{self.field_name});"

    encode_func = None

@@ -566,17 +550,17 @@ def create_field_type_info(
        # For messages that decode (SOURCE_CLIENT or SOURCE_BOTH), use pointer
        # for zero-copy access to the receive buffer
        if needs_decode:
-            return PointerToBytesBufferType(field, needs_decode)
+            return PointerToBytesBufferType(field, None)

        # For SOURCE_SERVER (encode only), explicit annotation is still needed
        if get_field_opt(field, pb.pointer_to_buffer, False):
-            return PointerToBytesBufferType(field, needs_decode)
+            return PointerToBytesBufferType(field, None)

        return BytesType(field, needs_decode, needs_encode)

    # Special handling for string fields - use StringRef for zero-copy
    if field.type == 9:
-        return PointerToStringBufferType(field, needs_decode)
+        return PointerToStringBufferType(field, None)

    validate_field_type(field.type, field.name)
    if field.type == 11:
@@ -621,6 +605,7 @@ class DoubleType(FixedSizeTypeMixin, TypeInfo):
    # Unsupported but defined for completeness
    cpp_type = "double"
    default_value = "0.0"
+    decode_64bit = "value.as_double()"
    encode_func = "encode_double"
    wire_type = WireType.FIXED64  # Uses wire type 1 according to protobuf spec

@@ -646,12 +631,10 @@ class DoubleType(FixedSizeTypeMixin, TypeInfo):
 class FloatType(FixedSizeTypeMixin, TypeInfo):
    cpp_type = "float"
    default_value = "0.0f"
-    decode_expr = "value.as_float()"
+    decode_32bit = "value.as_float()"
    encode_func = "encode_float"
    wire_type = WireType.FIXED32  # Uses wire type 5

-    fixed32_value_template = "float_to_raw({value})"
-
    def dump(self, name: str) -> str:
        o = f'snprintf(buffer, sizeof(buffer), "%g", {name});\n'
        o += "out.append(buffer);"
@@ -675,7 +658,7 @@ class Int64Type(VarintTypeMixin, TypeInfo):
    cpp_type = "int64_t"
    _varint_max_bits = 64
    default_value = "0"
-    decode_expr = "static_cast<int64_t>(value.as_varint())"
+    decode_varint = "static_cast<int64_t>(value)"
    encode_func = "encode_int64"
    wire_type = WireType.VARINT  # Uses wire type 0

@@ -696,7 +679,7 @@ class UInt64Type(VarintTypeMixin, TypeInfo):
    cpp_type = "uint64_t"
    _varint_max_bits = 64
    default_value = "0"
-    decode_expr = "value.as_varint()"
+    decode_varint = "value"
    encode_func = "encode_uint64"
    wire_type = WireType.VARINT  # Uses wire type 0

@@ -714,11 +697,11 @@ class UInt64Type(VarintTypeMixin, TypeInfo):
        return self._get_simple_size_calculation(name, force, "uint64")

    @property
-    def RAW_ENCODE_MAP(self) -> dict[str, tuple[str, str]]:  # noqa: N802
+    def RAW_ENCODE_MAP(self) -> dict[str, str]:  # noqa: N802
        if self.mac_address:
            return {
                **TypeInfo.RAW_ENCODE_MAP,
-                "encode_uint64": ("encode_varint_raw_48bit", "{value}"),
+                "encode_uint64": "ProtoEncode::encode_varint_raw_48bit(pos, {value});",
            }
        return TypeInfo.RAW_ENCODE_MAP

@@ -731,7 +714,7 @@ class Int32Type(VarintTypeMixin, TypeInfo):
    cpp_type = "int32_t"
    _varint_max_bits = 64  # int32 is sign-extended to 64 bits in protobuf
    default_value = "0"
-    decode_expr = "static_cast<int32_t>(value.as_varint())"
+    decode_varint = "static_cast<int32_t>(value)"
    encode_func = "encode_int32"
    wire_type = WireType.VARINT  # Uses wire type 0

@@ -751,6 +734,7 @@ class Int32Type(VarintTypeMixin, TypeInfo):
 class Fixed64Type(FixedSizeTypeMixin, TypeInfo):
    cpp_type = "uint64_t"
    default_value = "0"
+    decode_64bit = "value.as_fixed64()"
    encode_func = "encode_fixed64"
    wire_type = WireType.FIXED64  # Uses wire type 1

@@ -776,7 +760,7 @@ class Fixed64Type(FixedSizeTypeMixin, TypeInfo):
 class Fixed32Type(FixedSizeTypeMixin, TypeInfo):
    cpp_type = "uint32_t"
    default_value = "0"
-    decode_expr = "value.as_fixed32()"
+    decode_32bit = "value.as_fixed32()"
    encode_func = "encode_fixed32"
    wire_type = WireType.FIXED32  # Uses wire type 5

@@ -785,7 +769,15 @@ class Fixed32Type(FixedSizeTypeMixin, TypeInfo):
        o += "out.append(buffer);"
        return o

-    fixed32_value_template = "{value}"
+    @property
+    def encode_content(self) -> str:
+        tag = self.calculate_tag()
+        if self.force and tag < 128:
+            # Emit combined tag+value write: precomputed tag + direct memcpy
+            return f"ProtoEncode::write_tag_and_fixed32(pos, {tag}, this->{self.field_name});"
+        if self.force:
+            return f"ProtoEncode::{self.encode_func}(pos, {self.number}, this->{self.field_name}, true);"
+        return f"ProtoEncode::{self.encode_func}(pos, {self.number}, this->{self.field_name});"

    def get_size_calculation(self, name: str, force: bool = False) -> str:
        field_id_size = self.calculate_field_id_size()
@@ -805,7 +797,7 @@ class BoolType(VarintTypeMixin, TypeInfo):
    _varint_max_bits = 1
    cpp_type = "bool"
    default_value = "false"
-    decode_expr = "value.as_bool()"
+    decode_varint = "value != 0"
    encode_func = "encode_bool"
    wire_type = WireType.VARINT  # Uses wire type 0

@@ -825,7 +817,7 @@ class StringType(TypeInfo):
    default_value = ""
    reference_type = "std::string &"
    const_reference_type = "const std::string &"
-    decode_expr = "value.as_string()"
+    decode_length = "value.as_string()"
    encode_func = "encode_string"
    wire_type = WireType.LENGTH_DELIMITED  # Uses wire type 2

@@ -859,12 +851,9 @@ class StringType(TypeInfo):
            f"this->{self.field_name}_ref_.size()",
        ):
            return result
-        return _encode_call(
-            "encode_string",
-            str(self.number),
-            f"this->{self.field_name}_ref_",
-            force=self.force,
-        )
+        if self.force:
+            return f"ProtoEncode::encode_string(pos, {self.number}, this->{self.field_name}_ref_, true);"
+        return f"ProtoEncode::encode_string(pos, {self.number}, this->{self.field_name}_ref_);"

    def dump(self, name):
        # If name is 'it', this is a repeated field element - always use string
@@ -940,9 +929,6 @@ class MessageType(TypeInfo):
    def can_use_dump_field(cls) -> bool:
        return False

-    def encode_element(self, number: int, element: str) -> str:
-        return _encode_call("encode_sub_message", "buffer", str(number), element)
-
    @property
    def cpp_type(self) -> str:
        return self._field.type_name[1:]
@@ -965,9 +951,15 @@ class MessageType(TypeInfo):
    @property
    def encode_content(self) -> str:
        # Sub-message encoding needs buffer for backpatch/sync
-        return _encode_call(
-            self.encode_func, "buffer", str(self.number), f"this->{self.field_name}"
-        )
+        return f"ProtoEncode::{self.encode_func}(pos, buffer, {self.number}, this->{self.field_name});"
+
+    @property
+    def decode_length(self) -> str:
+        # Override to return None for message types because we can't use template-based
+        # decoding when the specific message type isn't known at compile time.
+        # Instead, we use the non-template decode_to_message() method which allows
+        # runtime polymorphism through virtual function calls.
+        return None

    @property
    def public_content(self) -> list[str]:
@@ -984,14 +976,19 @@ class MessageType(TypeInfo):
        )

    @property
-    def decode_content(self) -> str:
-        body = f"value.decode_to_message(this->{self.field_name});"
+    def decode_length_content(self) -> str:
+        # Custom decode that doesn't use templates
        if self._track_presence:
            # decode_to_message() cannot report failure, so setting the flag
            # afterwards only documents intent; a status-returning decode could
            # gate it for real without touching callers.
-            body += f"\nthis->has_{self.name} = true;"
-        return self.decode_case(body)
+            return (
+                f"case {self.number}:\n"
+                f"      value.decode_to_message(this->{self.field_name});\n"
+                f"      this->has_{self.name} = true;\n"
+                f"      break;"
+            )
+        return f"case {self.number}: value.decode_to_message(this->{self.field_name}); break;"

    def dump(self, name: str) -> str:
        return f"{name}.dump_to(out);"
@@ -1030,7 +1027,7 @@ class BytesType(TypeInfo):
    reference_type = "std::string &"
    const_reference_type = "const std::string &"
    encode_func = "encode_bytes"
-    decode_expr = "value.as_string()"
+    decode_length = "value.as_string()"
    wire_type = WireType.LENGTH_DELIMITED  # Uses wire type 2

    @property
@@ -1061,13 +1058,9 @@ class BytesType(TypeInfo):
            f"this->{self.field_name}_ptr_", f"this->{self.field_name}_len_"
        ):
            return result
-        return _encode_call(
-            "encode_bytes",
-            str(self.number),
-            f"this->{self.field_name}_ptr_",
-            f"this->{self.field_name}_len_",
-            force=self.force,
-        )
+        if self.force:
+            return f"ProtoEncode::encode_bytes(pos, {self.number}, this->{self.field_name}_ptr_, this->{self.field_name}_len_, true);"
+        return f"ProtoEncode::encode_bytes(pos, {self.number}, this->{self.field_name}_ptr_, this->{self.field_name}_len_);"

    def dump(self, name: str) -> str:
        ptr_dump = f"format_hex_pretty(this->{self.field_name}_ptr_, this->{self.field_name}_len_)"
@@ -1134,12 +1127,16 @@ class PointerToBufferTypeBase(TypeInfo):
    def can_use_dump_field(cls) -> bool:
        return False

-    # Only here to make needs_decode required: the null string default keys off it, so a call
-    # site must not fall back on the base class default
    def __init__(
-        self, field: descriptor.FieldDescriptorProto, needs_decode: bool
+        self, field: descriptor.FieldDescriptorProto, size: int | None = None
    ) -> None:
-        super().__init__(field, needs_decode)
+        super().__init__(field)
+        self.array_size = 0
+
+    @property
+    def decode_length(self) -> str | None:
+        # This is handled in decode_length_content
+        return None

    @property
    def wire_type(self) -> WireType:
@@ -1173,20 +1170,17 @@ class PointerToBytesBufferType(PointerToBufferTypeBase):
            f"this->{self.field_name}", f"this->{self.field_name}_len"
        ):
            return result
-        return _encode_call(
-            "encode_bytes",
-            str(self.number),
-            f"this->{self.field_name}",
-            f"this->{self.field_name}_len",
-            force=self.force,
-        )
+        if self.force:
+            return f"ProtoEncode::encode_bytes(pos, {self.number}, this->{self.field_name}, this->{self.field_name}_len, true);"
+        return f"ProtoEncode::encode_bytes(pos, {self.number}, this->{self.field_name}, this->{self.field_name}_len);"

    @property
-    def decode_content(self) -> str:
-        return self.decode_case(
-            f"this->{self.field_name} = value.data();\n"
-            f"this->{self.field_name}_len = value.size();",
-        )
+    def decode_length_content(self) -> str | None:
+        return f"""case {self.number}: {{
+      this->{self.field_name} = value.data();
+      this->{self.field_name}_len = value.size();
+      break;
+    }}"""

    def dump(self, name: str) -> str:
        return (
@@ -1220,53 +1214,34 @@ class PointerToStringBufferType(PointerToBufferTypeBase):
    def can_use_dump_field(cls) -> bool:
        return True

-    @property
-    def _starts_null(self) -> bool:
-        """A field that is only encoded, and skipped when empty, never has its pointer read
-        before it is set, so it can default to a null StringRef and the message constructs as
-        one zero fill. Any encode path that copies unconditionally must check this."""
-        return not self._needs_decode and not self.force
-
    @property
    def public_content(self) -> list[str]:
-        if self._starts_null:
-            return [
-                f"StringRef {self.field_name}{{nullptr, 0}};  // null until set, encode only"
-            ]
        return [f"StringRef {self.field_name}{{}};"]

    @property
    def encode_content(self) -> str:
        max_len = self.max_data_length
        if max_len is not None and max_len < 128 and self.force:
-            assert not self._starts_null, (
-                "unconditional copy of a field that may start null"
-            )
            tag = self.calculate_tag()
            if tag < 128:
-                return _encode_call(
-                    "encode_short_string_force", str(tag), f"this->{self.field_name}"
-                )
+                return f"ProtoEncode::encode_short_string_force(pos, {tag}, this->{self.field_name});"
        if result := self._encode_bytes_with_precomputed_tag(
            f"this->{self.field_name}.c_str()",
            f"this->{self.field_name}.size()",
        ):
-            assert not self._starts_null, (
-                "unconditional copy of a field that may start null"
-            )
            return result
-        return _encode_call(
-            "encode_string",
-            str(self.number),
-            f"this->{self.field_name}",
-            force=self.force,
+        if self.force:
+            return f"ProtoEncode::encode_string(pos, {self.number}, this->{self.field_name}, true);"
+        return (
+            f"ProtoEncode::encode_string(pos, {self.number}, this->{self.field_name});"
        )

    @property
-    def decode_content(self) -> str:
-        return self.decode_case(
-            f"this->{self.field_name} = StringRef(value.data(), value.size());",
-        )
+    def decode_length_content(self) -> str | None:
+        return f"""case {self.number}: {{
+      this->{self.field_name} = StringRef(reinterpret_cast<const char *>(value.data()), value.size());
+      break;
+    }}"""

    def dump(self, name: str) -> str:
        # Not used since we use dump_field, but required by abstract base class
@@ -1335,13 +1310,14 @@ class PackedBufferTypeInfo(TypeInfo):
        ]

    @property
-    def decode_content(self) -> str:
+    def decode_length_content(self) -> str:
        """Store pointer to buffer and calculate count of packed varints."""
-        return self.decode_case(
-            f"this->{self.field_name}_data_ = value.data();\n"
-            f"this->{self.field_name}_length_ = value.size();\n"
-            f"this->{self.field_name}_count_ = count_packed_varints(value.data(), value.size());",
-        )
+        return f"""case {self.number}: {{
+      this->{self.field_name}_data_ = value.data();
+      this->{self.field_name}_length_ = value.size();
+      this->{self.field_name}_count_ = count_packed_varints(value.data(), value.size());
+      break;
+    }}"""

    @property
    def encode_content(self) -> str:
@@ -1426,11 +1402,17 @@ class FixedArrayBytesType(TypeInfo):
        ]

    @property
-    def decode_content(self) -> str:
-        return self.decode_case(
-            f"this->{self.field_name}_len = std::min<size_t>(value.size(), {self.array_size});\n"
-            f"memcpy(this->{self.field_name}, value.data(), this->{self.field_name}_len);",
-        )
+    def decode_length_content(self) -> str:
+        o = f"case {self.number}: {{\n"
+        o += "  const std::string &data_str = value.as_string();\n"
+        o += f"  this->{self.field_name}_len = data_str.size();\n"
+        o += f"  if (this->{self.field_name}_len > {self.array_size}) {{\n"
+        o += f"    this->{self.field_name}_len = {self.array_size};\n"
+        o += "  }\n"
+        o += f"  memcpy(this->{self.field_name}, data_str.data(), this->{self.field_name}_len);\n"
+        o += "  break;\n"
+        o += "}"
+        return o

    @property
    def encode_content(self) -> str:
@@ -1439,13 +1421,9 @@ class FixedArrayBytesType(TypeInfo):
            f"this->{self.field_name}", f"this->{self.field_name}_len", max_len=max_len
        ):
            return result
-        return _encode_call(
-            "encode_bytes",
-            str(self.number),
-            f"this->{self.field_name}",
-            f"this->{self.field_name}_len",
-            force=self.force,
-        )
+        if self.force:
+            return f"ProtoEncode::encode_bytes(pos, {self.number}, this->{self.field_name}, this->{self.field_name}_len, true);"
+        return f"ProtoEncode::encode_bytes(pos, {self.number}, this->{self.field_name}, this->{self.field_name}_len);"

    def dump(self, name: str) -> str:
        return f"out.append(format_hex_pretty({name}, {name}_len));"
@@ -1493,7 +1471,7 @@ class UInt32Type(VarintTypeMixin, TypeInfo):
    cpp_type = "uint32_t"
    _varint_max_bits = 32
    default_value = "0"
-    decode_expr = "value.as_varint()"
+    decode_varint = "value"
    encode_func = "encode_uint32"
    wire_type = WireType.VARINT  # Uses wire type 0

@@ -1516,21 +1494,13 @@ class UInt32Type(VarintTypeMixin, TypeInfo):
 class EnumType(VarintTypeMixin, TypeInfo):
    _varint_max_bits = 32

-    def encode_element(self, number: int, element: str) -> str:
-        return _encode_call(
-            self.encode_func,
-            str(number),
-            f"static_cast<uint32_t>({element})",
-            force=True,
-        )
-
    @property
    def cpp_type(self) -> str:
        return f"enums::{self._field.type_name[1:]}"

    @property
-    def decode_expr(self) -> str:
-        return f"static_cast<{self.cpp_type}>(value.as_varint())"
+    def decode_varint(self) -> str:
+        return f"static_cast<{self.cpp_type}>(value)"

    default_value = ""
    wire_type = WireType.VARINT  # Uses wire type 0
@@ -1550,9 +1520,9 @@ class EnumType(VarintTypeMixin, TypeInfo):
    @property
    def encode_content(self) -> str:
        value_expr = f"static_cast<uint32_t>(this->{self.field_name})"
-        return _encode_call(
-            self.encode_func, str(self.number), value_expr, force=self.force
-        )
+        if self.force:
+            return f"ProtoEncode::{self.encode_func}(pos, {self.number}, {value_expr}, true);"
+        return f"ProtoEncode::{self.encode_func}(pos, {self.number}, {value_expr});"

    def dump(self, name: str) -> str:
        return f"out.append_p(proto_enum_to_string<{self.cpp_type}>({name}));"
@@ -1577,7 +1547,7 @@ class EnumType(VarintTypeMixin, TypeInfo):
 class SFixed32Type(FixedSizeTypeMixin, TypeInfo):
    cpp_type = "int32_t"
    default_value = "0"
-    decode_expr = "value.as_sfixed32()"
+    decode_32bit = "value.as_sfixed32()"
    encode_func = "encode_sfixed32"
    wire_type = WireType.FIXED32  # Uses wire type 5

@@ -1603,6 +1573,7 @@ class SFixed32Type(FixedSizeTypeMixin, TypeInfo):
 class SFixed64Type(FixedSizeTypeMixin, TypeInfo):
    cpp_type = "int64_t"
    default_value = "0"
+    decode_64bit = "value.as_sfixed64()"
    encode_func = "encode_sfixed64"
    wire_type = WireType.FIXED64  # Uses wire type 1

@@ -1629,7 +1600,7 @@ class SInt32Type(VarintTypeMixin, TypeInfo):
    cpp_type = "int32_t"
    _varint_max_bits = 32  # zigzag encoding keeps it 32-bit
    default_value = "0"
-    decode_expr = "decode_zigzag32(static_cast<uint32_t>(value.as_varint()))"
+    decode_varint = "decode_zigzag32(static_cast<uint32_t>(value))"
    encode_func = "encode_sint32"
    wire_type = WireType.VARINT  # Uses wire type 0

@@ -1650,7 +1621,7 @@ class SInt64Type(VarintTypeMixin, TypeInfo):
    cpp_type = "int64_t"
    _varint_max_bits = 64
    default_value = "0"
-    decode_expr = "decode_zigzag64(value.as_varint())"
+    decode_varint = "decode_zigzag64(value)"
    encode_func = "encode_sint64"
    wire_type = WireType.VARINT  # Uses wire type 0

@@ -1730,9 +1701,9 @@ def _generate_inline_encode_block(

    lines = []
    lines.append(f"auto &sub_msg = {element};")
-    lines.append(_encode_call("write_raw_byte", str(tag)))
+    lines.append(f"ProtoEncode::write_raw_byte(pos, {tag});")
    lines.append("uint8_t *len_pos = pos;")
-    lines.append(_encode_call("reserve_byte"))
+    lines.append("ProtoEncode::reserve_byte(pos);")

    # Generate inline field encoding for each sub-message field
    for field in sub_desc.field:
@@ -1803,11 +1774,18 @@ class FixedArrayRepeatedType(TypeInfo):

    def _encode_element(self, element: str) -> str:
        """Helper to generate encode statement for a single element."""
-        if isinstance(self._ti, MessageType) and _is_inline_encode(self._ti.cpp_type):
-            return _generate_inline_encode_block(
-                self.number, self._ti.cpp_type, element
-            )
-        return self._ti.encode_element(self.number, element)
+        if isinstance(self._ti, EnumType):
+            return f"ProtoEncode::{self._ti.encode_func}(pos, {self.number}, static_cast<uint32_t>({element}), true);"
+        # Repeated message elements use encode_sub_message (force=true is default)
+        if isinstance(self._ti, MessageType):
+            if _is_inline_encode(self._ti.cpp_type):
+                return _generate_inline_encode_block(
+                    self.number, self._ti.cpp_type, element
+                )
+            return f"ProtoEncode::encode_sub_message(pos, buffer, {self.number}, {element});"
+        return (
+            f"ProtoEncode::{self._ti.encode_func}(pos, {self.number}, {element}, true);"
+        )

    @property
    def cpp_type(self) -> str:
@@ -2101,23 +2079,55 @@ class RepeatedTypeInfo(TypeInfo):
        return self._ti.wire_type

    @property
-    def decode_expr(self) -> str | None:
-        return self._ti.decode_expr
-
-    def _decode_store(self, expr: str) -> str:
-        return f"this->{self.field_name}.push_back({expr});"
-
-    @property
-    def decode_content(self) -> str | None:
+    def decode_varint_content(self) -> str:
        # Pointer fields don't support decoding
        if self._use_pointer:
            return None
-        if isinstance(self._ti, MessageType):
-            return self.decode_case(
-                f"this->{self.field_name}.emplace_back();\n"
-                f"value.decode_to_message(this->{self.field_name}.back());"
-            )
-        return super().decode_content
+        content = self._ti.decode_varint
+        if content is None:
+            return None
+        return (
+            f"case {self.number}: this->{self.field_name}.push_back({content}); break;"
+        )
+
+    @property
+    def decode_length_content(self) -> str:
+        # Pointer fields don't support decoding
+        if self._use_pointer:
+            return None
+        content = self._ti.decode_length
+        if content is None and isinstance(self._ti, MessageType):
+            # Special handling for non-template message decoding
+            return f"case {self.number}: this->{self.field_name}.emplace_back(); value.decode_to_message(this->{self.field_name}.back()); break;"
+        if content is None:
+            return None
+        return (
+            f"case {self.number}: this->{self.field_name}.push_back({content}); break;"
+        )
+
+    @property
+    def decode_32bit_content(self) -> str:
+        # Pointer fields don't support decoding
+        if self._use_pointer:
+            return None
+        content = self._ti.decode_32bit
+        if content is None:
+            return None
+        return (
+            f"case {self.number}: this->{self.field_name}.push_back({content}); break;"
+        )
+
+    @property
+    def decode_64bit_content(self) -> str:
+        # Pointer fields don't support decoding
+        if self._use_pointer:
+            return None
+        content = self._ti.decode_64bit
+        if content is None:
+            return None
+        return (
+            f"case {self.number}: this->{self.field_name}.push_back({content}); break;"
+        )

    @property
    def _ti_is_bool(self) -> bool:
@@ -2125,7 +2135,15 @@ class RepeatedTypeInfo(TypeInfo):
        return isinstance(self._ti, BoolType)

    def _encode_element_call(self, element: str) -> str:
-        return self._ti.encode_element(self.number, element)
+        """Helper to generate encode call for a single element."""
+        if isinstance(self._ti, EnumType):
+            return f"ProtoEncode::{self._ti.encode_func}(pos, {self.number}, static_cast<uint32_t>({element}), true);"
+        # Repeated message elements use encode_sub_message (force=true is default)
+        if isinstance(self._ti, MessageType):
+            return f"ProtoEncode::encode_sub_message(pos, buffer, {self.number}, {element});"
+        return (
+            f"ProtoEncode::{self._ti.encode_func}(pos, {self.number}, {element}, true);"
+        )

    @property
    def encode_content(self) -> str:
@@ -2134,7 +2152,7 @@ class RepeatedTypeInfo(TypeInfo):
            # Special handling for const char* elements (when container_no_template contains "const char")
            if "const char" in self._container_no_template:
                o = f"for (const char *it : *this->{self.field_name}) {{\n"
-                o += f"  {_encode_call(self._ti.encode_func, str(self.number), 'it', 'strlen(it)', force=True)}\n"
+                o += f"  ProtoEncode::{self._ti.encode_func}(pos, {self.number}, it, strlen(it), true);\n"
            else:
                o = f"for (const auto &it : *this->{self.field_name}) {{\n"
                o += f"  {self._encode_element_call('it')}\n"
@@ -2520,7 +2538,10 @@ def build_message_type(
 ) -> tuple[str, str, str]:
    public_content: list[str] = []
    protected_content: list[str] = []
-    decode: list[str] = []
+    decode_varint: list[str] = []
+    decode_length: list[str] = []
+    decode_32bit: list[str] = []
+    decode_64bit: list[str] = []
    encode: list[str] = []
    dump: list[str] = []
    size_calc: list[str] = []
@@ -2536,8 +2557,8 @@ def build_message_type(

    # Get source direction to determine if we need decode/encode methods
    source = message_source_map[desc.name]
-    needs_decode = message_needs_decode(source)
-    needs_encode = message_needs_encode(source)
+    needs_decode = source in (SOURCE_BOTH, SOURCE_CLIENT)
+    needs_encode = source in (SOURCE_BOTH, SOURCE_SERVER)

    # Add MESSAGE_TYPE method if this is a service message
    if message_id is not None:
@@ -2649,8 +2670,22 @@ def build_message_type(
            if field.options.HasExtension(pb.field_ifdef):
                field_ifdef = field.options.Extensions[pb.field_ifdef]

-            if case := ti.decode_content:
-                decode.extend(wrap_with_ifdef(case, field_ifdef))
+            if ti.decode_varint_content:
+                decode_varint.extend(
+                    wrap_with_ifdef(ti.decode_varint_content, field_ifdef)
+                )
+            if ti.decode_length_content:
+                decode_length.extend(
+                    wrap_with_ifdef(ti.decode_length_content, field_ifdef)
+                )
+            if ti.decode_32bit_content:
+                decode_32bit.extend(
+                    wrap_with_ifdef(ti.decode_32bit_content, field_ifdef)
+                )
+            if ti.decode_64bit_content:
+                decode_64bit.extend(
+                    wrap_with_ifdef(ti.decode_64bit_content, field_ifdef)
+                )
        if ti.dump_content:
            # Check for field_ifdef option for dump as well
            field_ifdef = None
@@ -2660,23 +2695,50 @@ def build_message_type(
            dump.extend(wrap_with_ifdef(ti.dump_content, field_ifdef))

    cpp = ""
-    if decode:
-        o = f"void {desc.name}::decode_field(void *self, uint32_t tag, const uint8_t *data, proto_varint_value_t scalar) {{\n"
-        o += f"  auto &msg = *static_cast<{desc.name} *>(self);\n"
-        o += "  const ProtoFieldValue value(data, scalar);\n"
-        o += "  switch (tag) {\n"
-        o += indent("\n".join(decode), "    ").replace("this->", "msg.") + "\n"
+    if decode_varint:
+        o = f"bool {desc.name}::decode_varint(uint32_t field_id, proto_varint_value_t value) {{\n"
+        o += "  switch (field_id) {\n"
+        o += indent("\n".join(decode_varint), "    ") + "\n"
+        o += "    default: return false;\n"
        o += "  }\n"
+        o += "  return true;\n"
        o += "}\n"
        cpp += o
-        prot = "static void decode_field(void *self, uint32_t tag, const uint8_t *data, proto_varint_value_t scalar);"
+        prot = "bool decode_varint(uint32_t field_id, proto_varint_value_t value) override;"
+        protected_content.insert(0, prot)
+    if decode_length:
+        o = f"bool {desc.name}::decode_length(uint32_t field_id, ProtoLengthDelimited value) {{\n"
+        o += "  switch (field_id) {\n"
+        o += indent("\n".join(decode_length), "    ") + "\n"
+        o += "    default: return false;\n"
+        o += "  }\n"
+        o += "  return true;\n"
+        o += "}\n"
+        cpp += o
+        prot = "bool decode_length(uint32_t field_id, ProtoLengthDelimited value) override;"
+        protected_content.insert(0, prot)
+    if decode_32bit:
+        o = f"bool {desc.name}::decode_32bit(uint32_t field_id, Proto32Bit value) {{\n"
+        o += "  switch (field_id) {\n"
+        o += indent("\n".join(decode_32bit), "    ") + "\n"
+        o += "    default: return false;\n"
+        o += "  }\n"
+        o += "  return true;\n"
+        o += "}\n"
+        cpp += o
+        prot = "bool decode_32bit(uint32_t field_id, Proto32Bit value) override;"
+        protected_content.insert(0, prot)
+    if decode_64bit:
+        o = f"bool {desc.name}::decode_64bit(uint32_t field_id, Proto64Bit value) {{\n"
+        o += "  switch (field_id) {\n"
+        o += indent("\n".join(decode_64bit), "    ") + "\n"
+        o += "    default: return false;\n"
+        o += "  }\n"
+        o += "  return true;\n"
+        o += "}\n"
+        cpp += o
+        prot = "bool decode_64bit(uint32_t field_id, Proto64Bit value) override;"
        protected_content.insert(0, prot)
-        if not fixed_vector_fields:
-            public_content.append(
-                "void decode(const uint8_t *buffer, size_t length) {\n"
-                "  ProtoDecodableMessage::decode_fields(this, buffer, length, &decode_field);\n"
-                "}"
-            )

    # Generate custom decode() override for messages with FixedVector fields
    if fixed_vector_fields:
@@ -2686,8 +2748,8 @@ def build_message_type(
        for field_name, field_number in fixed_vector_fields:
            o += f"  uint32_t count_{field_name} = ProtoDecodableMessage::count_repeated_field(buffer, length, {field_number});\n"
            o += f"  this->{field_name}.init(count_{field_name});\n"
-        # Then the shared loop fills them
-        o += "  ProtoDecodableMessage::decode_fields(this, buffer, length, &decode_field);\n"
+        # Call parent decode to populate the fields
+        o += "  ProtoDecodableMessage::decode(buffer, length);\n"
        o += "}\n"
        cpp += o
        # Generate the decode() declaration in header (public method)
@@ -2722,36 +2784,28 @@ def build_message_type(
            )
            for line in encode
        ]
-        o = f"{speed_attr}uint8_t *{desc.name}::encode_msg(const void *self, ProtoWriteBuffer &buffer PROTO_ENCODE_DEBUG_PARAM) {{\n"
-        o += f"  const auto &msg = *static_cast<const {desc.name} *>(self);\n"
+        o = f"{speed_attr}uint8_t *{desc.name}::encode(ProtoWriteBuffer &buffer PROTO_ENCODE_DEBUG_PARAM) const {{\n"
        o += "  uint8_t *__restrict__ pos = buffer.get_pos();\n"
-        o += indent("\n".join(encode_debug)).replace("this->", "msg.") + "\n"
+        o += indent("\n".join(encode_debug)) + "\n"
        o += "  return pos;\n"
        o += "}\n"
        cpp += o
-        public_content.append(
-            "static uint8_t *encode_msg(const void *self, ProtoWriteBuffer &buffer PROTO_ENCODE_DEBUG_PARAM);"
-        )
-        public_content.append(
-            "uint8_t *encode(ProtoWriteBuffer &buffer PROTO_ENCODE_DEBUG_PARAM) const {\n"
-            "  return encode_msg(this, buffer PROTO_ENCODE_DEBUG_ARG);\n"
-            "}"
+        prot = (
+            "uint8_t *encode(ProtoWriteBuffer &buffer PROTO_ENCODE_DEBUG_PARAM) const;"
        )
+        public_content.append(prot)
    # If no fields to encode or message doesn't need encoding, the default implementation in ProtoMessage will be used

    # Add calculate_size method only if this message needs encoding and has fields
    if needs_encode and size_calc and not is_inline_only:
-        o = f"{speed_attr}uint32_t {desc.name}::calc_size_msg(const void *self) {{\n"
-        o += f"  const auto &msg = *static_cast<const {desc.name} *>(self);\n"
+        o = f"{speed_attr}uint32_t {desc.name}::calculate_size() const {{\n"
        o += "  uint32_t size = 0;\n"
-        o += indent("\n".join(size_calc)).replace("this->", "msg.") + "\n"
+        o += indent("\n".join(size_calc)) + "\n"
        o += "  return size;\n"
        o += "}\n"
        cpp += o
-        public_content.append("static uint32_t calc_size_msg(const void *self);")
-        public_content.append(
-            "uint32_t calculate_size() const { return calc_size_msg(this); }"
-        )
+        prot = "uint32_t calculate_size() const;"
+        public_content.append(prot)
    # If no fields to calculate size for or message doesn't need encoding, the default implementation in ProtoMessage will be used

    # dump_to method declaration in header
@@ -2846,23 +2900,6 @@ def get_field_opt(
    return field.options.Extensions[opt]


-def message_needs_decode(source: int) -> bool:
-    return source in (SOURCE_BOTH, SOURCE_CLIENT)
-
-
-def message_needs_encode(source: int) -> bool:
-    return source in (SOURCE_BOTH, SOURCE_SERVER)
-
-
-def is_decodable_class(desc: descriptor.DescriptorProto, source: int) -> bool:
-    """Whether the generated class derives from ProtoDecodableMessage: decoded, and either on a
-    decodable base class or with at least one live field."""
-    return message_needs_decode(source) and (
-        get_base_class(desc) is not None
-        or any(not field.options.deprecated for field in desc.field)
-    )
-
-
 def get_base_class(desc: descriptor.DescriptorProto) -> str | None:
    """Get the base_class option from a message descriptor."""
    if not desc.options.HasExtension(pb.base_class):
@@ -2964,11 +3001,11 @@ def build_base_class(

    # Determine if any message using this base class needs decoding/encoding
    needs_decode = any(
-        message_needs_decode(message_source_map.get(msg.name, SOURCE_BOTH))
+        message_source_map.get(msg.name, SOURCE_BOTH) in (SOURCE_BOTH, SOURCE_CLIENT)
        for msg in messages
    )
    needs_encode = any(
-        message_needs_encode(message_source_map.get(msg.name, SOURCE_BOTH))
+        message_source_map.get(msg.name, SOURCE_BOTH) in (SOURCE_BOTH, SOURCE_SERVER)
        for msg in messages
    )

@@ -3402,7 +3439,6 @@ static void dump_bytes_field(DumpBuffer &out, const char *field_name, const uint

    # Generate message types with base class information
    # Simple grouping by ifdef
-    decodable_messages: list[tuple[str, str | None]] = []
    current_ifdef = None

    for m in mt:
@@ -3419,8 +3455,6 @@ static void dump_bytes_field(DumpBuffer &out, const char *field_name, const uint
            continue

        s, c, dc = build_message_type(m, base_class_fields, message_source_map)
-        if is_decodable_class(m, message_source_map[m.name]):
-            decodable_messages.append((m.name, message_ifdef_map.get(m.name)))
        msg_ifdef = message_ifdef_map.get(m.name)

        # Handle ifdef changes
@@ -3447,22 +3481,6 @@ static void dump_bytes_field(DumpBuffer &out, const char *field_name, const uint
        cpp += "#endif\n"
        dump_cpp += "#endif\n"

-    # decode() passes decode_field explicitly, so without the dump virtuals no decodable message
-    # may carry a vtable; a build at any level below VERY_VERBOSE proves it
-    cpp += "#ifndef HAS_PROTO_MESSAGE_DUMP\n"
-    assert_ifdef = None
-    for name, msg_ifdef in decodable_messages:
-        if msg_ifdef != assert_ifdef:
-            if assert_ifdef is not None:
-                cpp += "#endif\n"
-            if msg_ifdef is not None:
-                cpp += _make_ifdef_line(msg_ifdef) + "\n"
-            assert_ifdef = msg_ifdef
-        cpp += f'static_assert(!std::is_polymorphic_v<{name}>, "decodable messages carry no vtable");\n'
-    if assert_ifdef is not None:
-        cpp += "#endif\n"
-    cpp += "#endif\n"
-
    content += """\

 }  // namespace esphome::api
@@ -249,7 +249,7 @@ static APIBuffer build_infrared_rf_transmit_wire() {
  std::memcpy(bytes + len, packed, packed_len);
  len += packed_len;
  // field 6: modulation = 1 (non-zero so it's actually emitted and exercises
-  // decode_field for this field, matching the documented layout above).
+  // decode_varint for this field, matching the documented layout above).
  put_byte(0x30);
  put_varint(1);

@@ -40,9 +40,6 @@ class SerialProxy {
    return SerialProxyResult::SERIAL_PROXY_RESULT_OK;
  }
  void write_from_client(api::APIConnection *api_connection, const uint8_t *data, size_t len) {}
-  SerialProxyResult set_mode_from_client(api::APIConnection *api_connection, api::enums::SerialProxyMode mode) {
-    return SerialProxyResult::SERIAL_PROXY_RESULT_OK;
-  }
  SerialProxyResult set_modem_pins(api::APIConnection *api_connection, uint32_t line_states) {
    return SerialProxyResult::SERIAL_PROXY_RESULT_OK;
  }
@@ -1,12 +0,0 @@
-esphome:
-  name: test
-
-esp32:
-  board: esp32dev
-  framework:
-    type: esp-idf
-
-wifi:
-  ap:
-
-sendspin:
@@ -1,18 +0,0 @@
-esphome:
-  name: test
-  project:
-    name: project_manufacturer.project_model
-    version: 9.9.9
-
-esp32:
-  board: esp32dev
-  framework:
-    type: esp-idf
-
-wifi:
-  ap:
-
-sendspin:
-  manufacturer: Explicit Manufacturer
-  model: Explicit Model
-  firmware_version: 1.2.3
@@ -1,15 +0,0 @@
-esphome:
-  name: test
-  project:
-    name: project_manufacturer.project_model
-    version: 9.9.9
-
-esp32:
-  board: esp32dev
-  framework:
-    type: esp-idf
-
-wifi:
-  ap:
-
-sendspin:
@@ -1,83 +0,0 @@
-"""Tests for the device information the sendspin hub reports to the server."""
-
-from __future__ import annotations
-
-from collections.abc import Callable
-from pathlib import Path
-
-import pytest
-
-from esphome import config_validation as cv
-from esphome.components.sendspin import (
-    CONF_FIRMWARE_VERSION,
-    CONF_MANUFACTURER,
-    CONFIG_SCHEMA,
-)
-from esphome.const import CONF_MODEL, PlatformFramework
-from tests.component_tests.types import SetCoreConfigCallable
-
-
-def test_explicit_device_info_wins_over_project(
-    generate_main: Callable[[str | Path], str],
-    component_config_path: Callable[[str], Path],
-) -> None:
-    """Configured values take precedence over the project information."""
-    main_cpp = generate_main(component_config_path("device_info_explicit.yaml"))
-
-    assert 'set_manufacturer("Explicit Manufacturer")' in main_cpp
-    assert 'set_model("Explicit Model")' in main_cpp
-    assert 'set_firmware_version("1.2.3")' in main_cpp
-
-
-def test_project_supplies_device_info(
-    generate_main: Callable[[str | Path], str],
-    component_config_path: Callable[[str], Path],
-) -> None:
-    """Without configured values, the project name splits into manufacturer and model."""
-    main_cpp = generate_main(component_config_path("device_info_project.yaml"))
-
-    assert 'set_manufacturer("project_manufacturer")' in main_cpp
-    assert 'set_model("project_model")' in main_cpp
-    assert 'set_firmware_version("9.9.9")' in main_cpp
-
-
-def test_no_device_info_leaves_hub_defaults(
-    generate_main: Callable[[str | Path], str],
-    component_config_path: Callable[[str], Path],
-) -> None:
-    """With neither source, nothing is emitted and the hub keeps its own defaults."""
-    main_cpp = generate_main(component_config_path("device_info_default.yaml"))
-
-    assert "set_manufacturer(" not in main_cpp
-    assert "set_model(" not in main_cpp
-    assert "set_firmware_version(" not in main_cpp
-
-
-@pytest.mark.parametrize(
-    "conf_key", [CONF_MANUFACTURER, CONF_MODEL, CONF_FIRMWARE_VERSION]
-)
-def test_empty_device_info_rejected(
-    set_core_config: SetCoreConfigCallable, conf_key: str
-) -> None:
-    """An empty string would be sent to the server as an empty value, so it is not accepted."""
-    set_core_config(PlatformFramework.ESP32_IDF)
-
-    with pytest.raises(cv.Invalid):
-        CONFIG_SCHEMA({conf_key: ""})
-
-
-@pytest.mark.parametrize(
-    "conf_key", [CONF_MANUFACTURER, CONF_MODEL, CONF_FIRMWARE_VERSION]
-)
-def test_device_info_capped_at_127_bytes(
-    set_core_config: SetCoreConfigCallable, conf_key: str
-) -> None:
-    """The cap is in bytes so the protobuf length prefix stays a single byte."""
-    set_core_config(PlatformFramework.ESP32_IDF)
-
-    CONFIG_SCHEMA({conf_key: "a" * 127})
-    with pytest.raises(cv.Invalid):
-        CONFIG_SCHEMA({conf_key: "a" * 128})
-    # 64 two-byte characters is 128 bytes.
-    with pytest.raises(cv.Invalid):
-        CONFIG_SCHEMA({conf_key: "é" * 64})
@@ -59,7 +59,7 @@ static void verify_mac(uint64_t mac, size_t expected_bytes) {
 #ifdef ESPHOME_DEBUG_API
  uint8_t *proto_debug_end_ = api_buf.data() + api_buf.size();
 #endif
-  pos = ProtoEncode::encode_varint_raw_48bit(pos PROTO_ENCODE_DEBUG_ARG, mac);
+  ProtoEncode::encode_varint_raw_48bit(pos PROTO_ENCODE_DEBUG_ARG, mac);
  size_t new_len = pos - api_buf.data();

  EXPECT_EQ(new_len, expected_bytes) << "mac=0x" << std::hex << mac << std::dec;
@@ -59,47 +59,4 @@ TEST(StringRefStartsWith, RefOverloadComparesOnlyTheViewedLength) {
  EXPECT_TRUE(ref.starts_with(prefix));
 }

-// The generated api messages start their encode only string fields as a null pointer with zero
-// length; every member must treat that exactly like the default constructed empty string.
-TEST(StringRefNullEmpty, BehavesAsEmptyString) {
-  const StringRef null_empty{nullptr, 0};
-  const StringRef empty;
-  EXPECT_TRUE(null_empty.empty());
-  EXPECT_EQ(null_empty.size(), 0u);
-  EXPECT_EQ(null_empty.c_str(), nullptr);
-  EXPECT_TRUE(null_empty == empty);
-  EXPECT_TRUE(null_empty == "");
-  EXPECT_TRUE(null_empty == std::string());
-  EXPECT_EQ(null_empty.compare(empty), 0);
-  EXPECT_EQ(null_empty.compare(""), 0);
-  EXPECT_LT(null_empty.compare("a"), 0);
-  EXPECT_TRUE(null_empty.starts_with(""));
-  EXPECT_FALSE(null_empty.starts_with("a"));
-  EXPECT_EQ(null_empty.str(), std::string());
-  EXPECT_EQ(null_empty.substr(0), std::string());
-  EXPECT_EQ(null_empty.find('a'), std::string::npos);
-  EXPECT_EQ(null_empty.find("a"), std::string::npos);
-  char buf[4] = "xyz";
-  EXPECT_EQ(null_empty.copy(buf, sizeof(buf)), 0u);
-  EXPECT_EQ(null_empty.begin(), null_empty.end());
-}
-
-TEST(StringRefNullEmpty, ComparesAgainstText) {
-  const StringRef null_empty{nullptr, 0};
-  const StringRef text("abc", 3);
-  EXPECT_FALSE(null_empty == text);
-  EXPECT_FALSE(text == null_empty);
-  EXPECT_LT(null_empty.compare(text), 0);
-  EXPECT_GT(text.compare(null_empty), 0);
-  EXPECT_TRUE(text.starts_with(null_empty));
-}
-
-TEST(StringRefNullEmpty, TwoNullViewsAreEqual) {
-  const StringRef a{nullptr, 0};
-  const StringRef b{nullptr, 0};
-  EXPECT_TRUE(a == b);
-  EXPECT_EQ(a.compare(b), 0);
-  EXPECT_TRUE(a.starts_with(b));
-}
-
 }  // namespace esphome::core::testing
@@ -4,6 +4,3 @@ psram:
 sendspin:
  id: sendspin_hub_id
  task_stack_in_psram: true
-  manufacturer: Test Manufacturer
-  model: Test Model
-  firmware_version: 1.2.3
@@ -1,14 +0,0 @@
-substitutions:
-  tx_pin: GPIO4
-  rx_pin: GPIO5
-
-# Compile the tap code paths; no tap is attached, so this exercises the
-# null-tap branches that a normal build never defines.
-esphome:
-  platformio_options:
-    build_flags:
-      - "-DUSE_SERIAL_PROXY_TAP"
-
-packages:
-  uart: !include ../../test_build_components/common/uart/esp32-idf.yaml
-  serial_proxy: !include common.yaml
@@ -1,43 +0,0 @@
-esphome:
-  name: api-decode-wire-types-test
-host:
-api:
-logger:
-  level: DEBUG
-
-switch:
-  - platform: template
-    name: "Wire Switch"
-    optimistic: true
-
-output:
-  - platform: template
-    id: wire_dim
-    type: float
-    write_action:
-      - lambda: ""
-
-light:
-  - platform: monochromatic
-    name: "Wire Light"
-    output: wire_dim
-    default_transition_length: 0s
-    effects:
-      - pulse:
-          name: Pulse
-
-text:
-  - platform: template
-    name: "Wire Text"
-    optimistic: true
-    mode: text
-    min_length: 0
-    max_length: 255
-
-number:
-  - platform: template
-    name: "Wire Number"
-    optimistic: true
-    min_value: -1000
-    max_value: 1000
-    step: 0.5
@@ -1,11 +0,0 @@
-esphome:
-  name: api-empty-message-test
-host:
-api:
-logger:
-  level: DEBUG
-
-switch:
-  - platform: template
-    name: "Empty Message Switch"
-    optimistic: true
@@ -1,58 +0,0 @@
-esphome:
-  name: api-encode-boundaries-test
-  # Top-level area fills DeviceInfoResponse.suggested_area (field 16, a two-byte tag)
-  area:
-    id: kitchen_area
-    name: Kitchen
-  on_boot:
-    - sensor.template.publish:
-        id: zero_then_value
-        state: 0.0
-
-host:
-api:
-logger:
-  level: DEBUG
-
-sensor:
-  - platform: template
-    name: "Zero Then Value"
-    id: zero_then_value
-    # Negative int32 takes the ten byte varint path
-    accuracy_decimals: -2
-    update_interval: never
-
-text_sensor:
-  - platform: template
-    name: "Long Text"
-    id: long_text
-    update_interval: never
-
-number:
-  - platform: template
-    name: "Negative Number"
-    optimistic: true
-    min_value: -1000
-    max_value: 1000
-    step: 0.5
-    initial_value: -123.5
-
-select:
-  - platform: template
-    name: "Long Option Select"
-    optimistic: true
-    options:
-      - short
-      - "option-with-a-name-long-enough-that-its-length-prefix-needs-two-varint-bytes-when-the-list-entities-response-is-encoded-xxxxxxxxxx"
-    initial_option: short
-
-button:
-  - platform: template
-    name: "Publish Values"
-    on_press:
-      - sensor.template.publish:
-          id: zero_then_value
-          state: 12.5
-      - text_sensor.template.publish:
-          id: long_text
-          state: !lambda return std::string(200, 'y');
@@ -125,12 +125,11 @@ class RawApiClient:
        await self.read_until_frame(MESSAGE_TYPE_OF[api_pb2.HelloResponse])

    async def send_message(self, msg: message.Message) -> None:
-        await self.send_raw(MESSAGE_TYPE_OF[type(msg)], msg.SerializeToString())
-
-    async def send_raw(self, msg_type: int, payload: bytes) -> None:
-        """Send a frame with a hand built payload, for shapes protobuf will not serialize."""
        loop = asyncio.get_running_loop()
-        await loop.sock_sendall(self._sock, encode_frame(msg_type, payload))
+        await loop.sock_sendall(
+            self._sock,
+            encode_frame(MESSAGE_TYPE_OF[type(msg)], msg.SerializeToString()),
+        )

    async def read_until_frame(self, msg_type: int, timeout: float = 10.0) -> None:
        """Read until at least one frame of msg_type has been received."""
@@ -57,46 +57,6 @@ async def wait_for_state(
    return await asyncio.wait_for(future, timeout=timeout)


-class StateWaiter:
-    """Route one state subscription to any number of predicate waits."""
-
-    def __init__(self) -> None:
-        self._waiters: list[
-            tuple[Callable[[EntityState], bool], asyncio.Future[EntityState]]
-        ] = []
-
-    def on_state(self, state: EntityState) -> None:
-        for predicate, future in self._waiters:
-            if future.done():
-                continue
-            try:
-                matched = predicate(state)
-            except Exception as exc:  # noqa: BLE001  the wait re-raises it, the callback must not die
-                future.set_exception(exc)
-                continue
-            if matched:
-                future.set_result(state)
-
-    async def expect(
-        self,
-        predicate: Callable[[EntityState], bool],
-        timeout: float = 5.0,
-        label: str | None = None,
-    ) -> EntityState:
-        """Wait for the next state matching ``predicate``; states seen before this call do not count."""
-        entry = (predicate, asyncio.get_running_loop().create_future())
-        self._waiters.append(entry)
-        try:
-            async with asyncio.timeout(timeout):
-                return await entry[1]
-        except TimeoutError:
-            raise TimeoutError(
-                f"no state matched {label or predicate} within {timeout}s"
-            ) from None
-        finally:
-            self._waiters.remove(entry)
-
-
 def find_entity[T: EntityInfo](
    entities: list[EntityInfo],
    object_id_substring: str,
@@ -1,142 +0,0 @@
-"""decode_field() must take fields that match their declared wire type, drop the ones that do
-not, skip unknown fields, and handle two byte tags, varints and length prefixes."""
-
-from __future__ import annotations
-
-from collections.abc import Callable
-import struct
-
-from aioesphomeapi import (
-    EntityState,
-    LightState,
-    NumberState,
-    SwitchState,
-    TextState,
-    api_pb2,
-)
-import pytest
-
-from .raw_api_client import MESSAGE_TYPE_OF, RawApiClient, encode_varint
-from .state_utils import InitialStateHelper, StateWaiter, require_entity
-from .types import APIClientConnectedFactory, RunCompiledFunction
-
-SWITCH_COMMAND = MESSAGE_TYPE_OF[api_pb2.SwitchCommandRequest]
-WIRE_VARINT, WIRE_LENGTH, WIRE_FIXED32 = 0, 2, 5
-
-
-def tag(field: int, wire_type: int) -> bytes:
-    return encode_varint((field << 3) | wire_type)
-
-
-@pytest.mark.asyncio
-async def test_api_decode_wire_types(
-    yaml_config: str,
-    run_compiled: RunCompiledFunction,
-    api_client_connected: APIClientConnectedFactory,
-    unused_tcp_port: int,
-) -> None:
-    async with (
-        run_compiled(yaml_config),
-        api_client_connected() as client,
-        RawApiClient(unused_tcp_port) as raw,
-    ):
-        entities, _ = await client.list_entities_services()
-        switch = require_entity(entities, "wire_switch")
-        light = require_entity(entities, "wire_light")
-        text = require_entity(entities, "wire_text")
-        number = require_entity(entities, "wire_number")
-        key = tag(1, WIRE_FIXED32) + struct.pack("<I", switch.key)
-        on, off = tag(2, WIRE_VARINT) + b"\x01", tag(2, WIRE_VARINT) + b"\x00"
-
-        switch_states: list[bool] = []
-        waiter = StateWaiter()
-
-        def on_state(state: EntityState) -> None:
-            if isinstance(state, SwitchState) and state.key == switch.key:
-                switch_states.append(state.state)
-            waiter.on_state(state)
-
-        def switch_is(value: bool) -> Callable[[EntityState], bool]:
-            return lambda s: (
-                isinstance(s, SwitchState) and s.key == switch.key and s.state is value
-            )
-
-        def number_is(value: float) -> Callable[[EntityState], bool]:
-            return lambda s: (
-                isinstance(s, NumberState) and s.key == number.key and s.state == value
-            )
-
-        initial = InitialStateHelper(entities)
-        client.subscribe_states(initial.on_state_wrapper(on_state))
-        await initial.wait_for_initial_states()
-        await raw.connect()
-
-        # A well formed command: fixed32 key, varint state
-        await raw.send_raw(SWITCH_COMMAND, key + on)
-        await waiter.expect(switch_is(True))
-        await raw.send_raw(SWITCH_COMMAND, key + off)
-        await waiter.expect(switch_is(False))
-
-        # The same field with the wrong wire type is dropped, and a varint key never matches an
-        # entity; each of these would turn the switch on if the payload were read as a varint
-        seen = len(switch_states)
-        await raw.send_raw(SWITCH_COMMAND, key + tag(2, WIRE_LENGTH) + b"\x01\x01")
-        await raw.send_raw(
-            SWITCH_COMMAND, key + tag(2, WIRE_FIXED32) + b"\x01\x00\x00\x00"
-        )
-        await raw.send_raw(
-            SWITCH_COMMAND, tag(1, WIRE_VARINT) + encode_varint(switch.key) + on
-        )
-        # Ordered on the raw socket itself: this frame cannot be parsed before the bad ones, so
-        # the only switch state since the marker must be the one it produces
-        await raw.send_raw(SWITCH_COMMAND, key + on)
-        await waiter.expect(switch_is(True), label="switch on after wrong wire types")
-        assert switch_states[seen:] == [True]
-        await raw.send_raw(SWITCH_COMMAND, key + off)
-        await waiter.expect(switch_is(False))
-
-        # Truncated bodies stop the decode loop without taking the connection down: a tag with its
-        # continuation bit set and nothing after it, a length prefix past the end of the payload,
-        # and a fixed32 with two of its four bytes
-        seen = len(switch_states)
-        await raw.send_raw(SWITCH_COMMAND, key + b"\x80")
-        await raw.send_raw(SWITCH_COMMAND, key + tag(2, WIRE_LENGTH) + b"\x7f" + b"ab")
-        await raw.send_raw(SWITCH_COMMAND, tag(1, WIRE_FIXED32) + b"\x01\x02")
-        await raw.send_raw(SWITCH_COMMAND, key + on)
-        await waiter.expect(switch_is(True), label="switch on after truncated frames")
-        assert switch_states[seen:] == [True]
-        await raw.send_raw(SWITCH_COMMAND, key + off)
-        await waiter.expect(switch_is(False))
-
-        # A negative number goes through the fixed32 float path of a normal client
-        client.number_command(number.key, -77.5)
-        await waiter.expect(number_is(-77.5))
-
-        # An unknown field ahead of the known ones is skipped; field 200 needs a two byte tag
-        await raw.send_raw(
-            SWITCH_COMMAND, tag(200, WIRE_VARINT) + encode_varint(300) + key + on
-        )
-        await waiter.expect(switch_is(True))
-
-        # Two byte tags (effect fields 18 and 19) and a two byte varint (300 ms transition)
-        client.light_command(
-            light.key, state=True, brightness=0.5, transition_length=0.3, effect="Pulse"
-        )
-        await waiter.expect(
-            lambda s: (
-                isinstance(s, LightState) and s.key == light.key and s.effect == "Pulse"
-            )
-        )
-        client.light_command(light.key, effect="None", state=False)
-        await waiter.expect(
-            lambda s: isinstance(s, LightState) and s.key == light.key and not s.state
-        )
-
-        # A string whose length prefix needs two varint bytes
-        long_text = "w" * 200
-        client.text_command(text.key, long_text)
-        await waiter.expect(
-            lambda s: (
-                isinstance(s, TextState) and s.key == text.key and s.state == long_text
-            )
-        )
@@ -1,37 +0,0 @@
-"""Messages without fields go through the shared ProtoMessage entry points on both directions."""
-
-from __future__ import annotations
-
-from aioesphomeapi import api_pb2
-import pytest
-
-from .raw_api_client import MESSAGE_TYPE_OF, RawApiClient
-from .types import RunCompiledFunction
-
-
-@pytest.mark.asyncio
-async def test_api_empty_message_roundtrip(
-    yaml_config: str,
-    run_compiled: RunCompiledFunction,
-    unused_tcp_port: int,
-) -> None:
-    async with run_compiled(yaml_config), RawApiClient(unused_tcp_port) as client:
-        await client.connect()
-
-        # Field free request and reply on the plain send path
-        await client.send_message(api_pb2.PingRequest())
-        await client.read_until_frame(MESSAGE_TYPE_OF[api_pb2.PingResponse])
-
-        # Field free request answered by a message with fields, and a list that ends with
-        # the field free ListEntitiesDoneResponse through the batching path
-        await client.send_message(api_pb2.DeviceInfoRequest())
-        await client.read_until_frame(MESSAGE_TYPE_OF[api_pb2.DeviceInfoResponse])
-        await client.send_message(api_pb2.ListEntitiesRequest())
-        await client.read_until_frame(MESSAGE_TYPE_OF[api_pb2.ListEntitiesDoneResponse])
-        assert (
-            client.frame_counts[MESSAGE_TYPE_OF[api_pb2.ListEntitiesSwitchResponse]]
-            == 1
-        )
-
-        await client.send_message(api_pb2.DisconnectRequest())
-        await client.read_until_frame(MESSAGE_TYPE_OF[api_pb2.DisconnectResponse])
@@ -1,78 +0,0 @@
-"""Encode paths at their branch boundaries: zero skipped float, fixed32 state, negative int32,
-length prefixes of two varint bytes and two byte field tags."""
-
-from __future__ import annotations
-
-import asyncio
-
-from aioesphomeapi import (
-    NumberState,
-    SelectInfo,
-    SensorInfo,
-    SensorState,
-    TextSensorState,
-)
-import pytest
-
-from .state_utils import InitialStateHelper, StateWaiter, require_entity
-from .types import APIClientConnectedFactory, RunCompiledFunction
-
-LONG_OPTION = (
-    "option-with-a-name-long-enough-that-its-length-prefix-needs-two-varint-bytes-"
-    "when-the-list-entities-response-is-encoded-xxxxxxxxxx"
-)
-
-
-@pytest.mark.asyncio
-async def test_api_encode_boundaries(
-    yaml_config: str,
-    run_compiled: RunCompiledFunction,
-    api_client_connected: APIClientConnectedFactory,
-) -> None:
-    async with run_compiled(yaml_config), api_client_connected() as client:
-        device_info, (entities, _) = await asyncio.gather(
-            client.device_info(), client.list_entities_services()
-        )
-        assert device_info.suggested_area == "Kitchen"
-
-        sensor = require_entity(entities, "zero_then_value", SensorInfo)
-        assert sensor.accuracy_decimals == -2
-        select = require_entity(entities, "long_option_select", SelectInfo)
-        assert len(LONG_OPTION) >= 128
-        assert select.options == ["short", LONG_OPTION]
-        text = require_entity(entities, "long_text")
-        number = require_entity(entities, "negative_number")
-        button = require_entity(entities, "publish_values")
-
-        initial = InitialStateHelper(entities)
-        waiter = StateWaiter()
-        client.subscribe_states(initial.on_state_wrapper(waiter.on_state))
-        await initial.wait_for_initial_states()
-
-        # A float of exactly zero is skipped on the wire and must still read as 0.0, not missing
-        first = initial.initial_states[sensor.key]
-        assert isinstance(first, SensorState)
-        assert first.state == 0.0 and not first.missing_state
-        first_number = initial.initial_states[number.key]
-        assert isinstance(first_number, NumberState)
-        assert first_number.state == -123.5
-
-        client.button_command(button.key)
-        await asyncio.gather(
-            waiter.expect(
-                lambda s: (
-                    isinstance(s, SensorState)
-                    and s.key == sensor.key
-                    and s.state == 12.5
-                ),
-                label="sensor 12.5",
-            ),
-            waiter.expect(
-                lambda s: (
-                    isinstance(s, TextSensorState)
-                    and s.key == text.key
-                    and s.state == "y" * 200
-                ),
-                label="text 200 x y",
-            ),
-        )
@@ -194,17 +194,17 @@ def test_superseded_device_info_fields_still_declared_in_header() -> None:

 def test_superseded_device_info_fields_still_encoded_and_sized() -> None:
    """Each superseded field must still be touched by DeviceInfoResponse's
-    generated encode_msg() and calc_size_msg(), i.e. it is still put on the wire.
+    generated encode() and calculate_size(), i.e. it is still put on the wire.
    """
-    encode_body = _extract_function_body(CPP_TEXT, "DeviceInfoResponse::encode_msg")
-    size_body = _extract_function_body(CPP_TEXT, "DeviceInfoResponse::calc_size_msg")
+    encode_body = _extract_function_body(CPP_TEXT, "DeviceInfoResponse::encode")
+    size_body = _extract_function_body(CPP_TEXT, "DeviceInfoResponse::calculate_size")
    for field_name in SUPERSEDED_FIELDS:
-        assert f"msg.{field_name}" in encode_body, (
-            f"DeviceInfoResponse::encode_msg() no longer references {field_name}. "
+        assert f"this->{field_name}" in encode_body, (
+            f"DeviceInfoResponse::encode() no longer references {field_name}. "
            f"{DEPRECATED_FIELD_TRAP}"
        )
-        assert f"msg.{field_name}" in size_body, (
-            f"DeviceInfoResponse::calc_size_msg() no longer references "
+        assert f"this->{field_name}" in size_body, (
+            f"DeviceInfoResponse::calculate_size() no longer references "
            f"{field_name}. {DEPRECATED_FIELD_TRAP}"
        )

@@ -380,13 +380,3 @@ def test_api_version_minor_is_at_least_15() -> None:
        "clients to see api_version >= 1.15 in HelloResponse before they will "
        "ever request it."
    )
-
-
-def test_generated_encode_calls_keep_the_cursor() -> None:
-    """No generated ProtoEncode call may drop the returned cursor."""
-    dropped = [
-        line
-        for line in CPP_TEXT.splitlines()
-        if "ProtoEncode::" in line and "pos = ProtoEncode::" not in line
-    ]
-    assert not dropped, dropped[:5]
@@ -15,13 +15,9 @@ import pytest

 sys.path.insert(0, str(Path(__file__).parents[4] / "script" / "api_protobuf"))

-import aioesphomeapi.api_options_pb2 as pb  # noqa: E402
 from api_protobuf import (  # noqa: E402
    MAX_MESSAGE_ID,
-    SOURCE_CLIENT,
    _make_ifdef_line,
-    build_message_type,
-    create_field_type_info,
    get_varint64_ifdef,
    validate_message_id,
 )
@@ -38,26 +34,16 @@ def _file_with_messages(
    file_desc = descriptor_pb2.FileDescriptorProto(name="test.proto")
    for name, field_type, deprecated in messages:
        msg = file_desc.message_type.add(name=name)
-        field = msg.field.add()
-        field.CopyFrom(_field(field_type))
+        field = msg.field.add(name="value", number=1, type=field_type)
        field.options.deprecated = deprecated
    return file_desc


 UINT64 = descriptor_pb2.FieldDescriptorProto.TYPE_UINT64
-MESSAGE = descriptor_pb2.FieldDescriptorProto.TYPE_MESSAGE
-DOUBLE = descriptor_pb2.FieldDescriptorProto.TYPE_DOUBLE
 INT64 = descriptor_pb2.FieldDescriptorProto.TYPE_INT64
 SINT64 = descriptor_pb2.FieldDescriptorProto.TYPE_SINT64
 UINT32 = descriptor_pb2.FieldDescriptorProto.TYPE_UINT32
-INT32 = descriptor_pb2.FieldDescriptorProto.TYPE_INT32
-SINT32 = descriptor_pb2.FieldDescriptorProto.TYPE_SINT32
 FIXED64 = descriptor_pb2.FieldDescriptorProto.TYPE_FIXED64
-FIXED32 = descriptor_pb2.FieldDescriptorProto.TYPE_FIXED32
-FLOAT = descriptor_pb2.FieldDescriptorProto.TYPE_FLOAT
-BOOL = descriptor_pb2.FieldDescriptorProto.TYPE_BOOL
-STRING = descriptor_pb2.FieldDescriptorProto.TYPE_STRING
-BYTES = descriptor_pb2.FieldDescriptorProto.TYPE_BYTES


 def test_no_varint64_fields() -> None:
@@ -121,222 +107,3 @@ def test_message_id_at_maximum_is_accepted() -> None:
 def test_message_id_above_maximum_is_rejected() -> None:
    with pytest.raises(ValueError, match="exceeds the plaintext"):
        validate_message_id(MAX_MESSAGE_ID + 1, "TooBigMessage")
-
-
-def _field(
-    field_type: int, number: int = 1, *, force: bool = False, repeated: bool = False
-) -> descriptor_pb2.FieldDescriptorProto:
-    field = descriptor_pb2.FieldDescriptorProto(
-        name="value", number=number, type=field_type
-    )
-    if repeated:
-        field.label = descriptor_pb2.FieldDescriptorProto.LABEL_REPEATED
-    if force:
-        field.options.Extensions[pb.force] = True
-    return field
-
-
-def _encode_field(
-    field_type: int, number: int = 1, force: bool = False, repeated: bool = False
-) -> str:
-    """Return the encode statement the generator emits for one encode-only field."""
-    field = _field(field_type, number, force=force, repeated=repeated)
-    return create_field_type_info(
-        field, needs_decode=False, needs_encode=True
-    ).encode_content
-
-
-SCALAR_TYPES = [
-    BOOL,
-    UINT32,
-    INT32,
-    UINT64,
-    INT64,
-    SINT32,
-    FLOAT,
-    FIXED32,
-    STRING,
-    BYTES,
-]
-
-
-@pytest.mark.parametrize("field_type", SCALAR_TYPES)
-def test_forced_fields_use_the_force_overload_or_raw_writes(field_type: int) -> None:
-    content = _encode_field(field_type, force=True)
-    assert (
-        "_force(" in content
-        or "write_raw_byte(" in content
-        or "write_tag_and_fixed32(" in content
-    ), content
-
-
-@pytest.mark.parametrize("field_type", [FLOAT, FIXED32])
-def test_single_byte_tag_fixed32_shares_the_outlined_writer(field_type: int) -> None:
-    unconditional = _encode_field(field_type, force=True)
-    assert unconditional.count("write_tag_and_fixed32(pos, 13,") == 1, unconditional
-    guarded = _encode_field(field_type, force=False)
-    assert guarded.startswith("if ("), guarded
-    assert "[[likely]]" in guarded
-    assert "write_tag_and_fixed32(pos, 13," in guarded
-
-
-@pytest.mark.parametrize("field_type", [FLOAT, FIXED32])
-def test_multi_byte_tag_fixed32_falls_back_to_the_generic_helper(
-    field_type: int,
-) -> None:
-    content = _encode_field(field_type, number=16)
-    assert "write_tag_and_fixed32" not in content, content
-    assert content.startswith("pos = ProtoEncode::encode_"), content
-
-
-def _decode_case(field_type: int, number: int, *, repeated: bool = False) -> str:
-    """Return the decode_field() case the generator emits for one decoded field."""
-    field = _field(field_type, number, repeated=repeated)
-    if field_type == MESSAGE:
-        field.type_name = ".Sub"
-    return create_field_type_info(
-        field, needs_decode=True, needs_encode=False
-    ).decode_content
-
-
-@pytest.mark.parametrize(
-    ("needs_decode", "force", "member"),
-    [
-        (False, False, "StringRef value{nullptr, 0};  // null until set, encode only"),
-        (True, False, "StringRef value{};"),
-        (False, True, "StringRef value{};"),
-    ],
-)
-def test_string_fields_default_to_null_only_when_never_read(
-    needs_decode: bool, force: bool, member: str
-) -> None:
-    """Only a string that is neither decoded nor force encoded may start as a null StringRef."""
-    ti = create_field_type_info(
-        _field(STRING, force=force), needs_decode=needs_decode, needs_encode=True
-    )
-    assert ti.public_content == [member]
-
-
-@pytest.mark.parametrize(
-    ("field_type", "number", "wire_type", "accessor"),
-    [
-        (UINT32, 2, "WIRE_TYPE_VARINT", "value.as_varint()"),
-        (BOOL, 3, "WIRE_TYPE_VARINT", "value.as_bool()"),
-        (STRING, 1, "WIRE_TYPE_LENGTH_DELIMITED", "value.data()"),
-        (FLOAT, 4, "WIRE_TYPE_FIXED32", "value.as_float()"),
-        (FIXED32, 5, "WIRE_TYPE_FIXED32", "value.as_fixed32()"),
-    ],
-)
-def test_decode_cases_carry_field_number_and_wire_type(
-    field_type: int, number: int, wire_type: str, accessor: str
-) -> None:
-    """Each decoded field yields one case keyed on its number and declared wire type."""
-    case = _decode_case(field_type, number)
-    lines = case.splitlines()
-    assert lines[0] == f"case proto_tag({number}, {wire_type}):", case
-    assert accessor in lines[1], case
-    assert lines[-1].strip() == "break;", case
-
-
-@pytest.mark.parametrize(
-    ("field_type", "repeated", "wire_type", "store"),
-    [
-        (UINT32, True, "WIRE_TYPE_VARINT", "this->value.push_back(value.as_varint());"),
-        (
-            STRING,
-            True,
-            "WIRE_TYPE_LENGTH_DELIMITED",
-            "this->value.push_back(value.as_string());",
-        ),
-        (
-            MESSAGE,
-            False,
-            "WIRE_TYPE_LENGTH_DELIMITED",
-            "value.decode_to_message(this->value);",
-        ),
-        (
-            MESSAGE,
-            True,
-            "WIRE_TYPE_LENGTH_DELIMITED",
-            "value.decode_to_message(this->value.back());",
-        ),
-    ],
-)
-def test_repeated_and_message_fields_decode_through_the_same_case_shape(
-    field_type: int, repeated: bool, wire_type: str, store: str
-) -> None:
-    """Repeated and sub message fields land in the one switch with their own store."""
-    case = _decode_case(field_type, 7, repeated=repeated)
-    lines = case.splitlines()
-    assert lines[0] == f"case proto_tag(7, {wire_type}):", case
-    assert store in case, case
-    if field_type == MESSAGE and repeated:
-        assert "this->value.emplace_back();" in case, case
-    assert lines[-1].strip() == "break;", case
-
-
-def test_a_fixed64_field_fails_at_generation_time() -> None:
-    """The decode loop has no 64 bit wire type path, so such a field must never reach it silently."""
-    desc = descriptor_pb2.DescriptorProto(name="Wide")
-    desc.field.add(name="ratio", number=1, type=DOUBLE)
-    with pytest.raises(
-        ValueError, match="64-bit type 'double' .*ratio.* not supported"
-    ):
-        build_message_type(desc, {}, {"Wide": SOURCE_CLIENT})
-
-
-def test_message_decodes_through_one_static_decode_field() -> None:
-    """All wire types of a decoded message land in one static decode_field() switch that the
-    inline decode() hands to the shared loop."""
-    desc = descriptor_pb2.DescriptorProto(name="Mixed")
-    desc.field.add(name="name", number=1, type=STRING)
-    desc.field.add(name="count", number=2, type=UINT32)
-    desc.field.add(name="level", number=3, type=FLOAT)
-    header, cpp, _ = build_message_type(desc, {}, {"Mixed": SOURCE_CLIENT})
-    decl = "static void decode_field(void *self, uint32_t tag, const uint8_t *data, proto_varint_value_t scalar);"
-    assert header.count(decl) == 1
-    assert (
-        cpp.count(
-            "void Mixed::decode_field(void *self, uint32_t tag, const uint8_t *data, proto_varint_value_t scalar) {"
-        )
-        == 1
-    )
-    assert "switch (tag) {" in cpp
-    assert "const ProtoFieldValue value(data, scalar);" in cpp
-    for number, wire_type in (
-        (1, "WIRE_TYPE_LENGTH_DELIMITED"),
-        (2, "WIRE_TYPE_VARINT"),
-        (3, "WIRE_TYPE_FIXED32"),
-    ):
-        assert f"case proto_tag({number}, {wire_type}):" in cpp, cpp
-    # The static body works on the cast message, never on this
-    assert "auto &msg = *static_cast<Mixed *>(self);" in cpp
-    assert "this->" not in cpp
-    assert (
-        header.count(
-            "ProtoDecodableMessage::decode_fields(this, buffer, length, &decode_field);"
-        )
-        == 1
-    )
-
-
-def test_fixed_vector_message_keeps_its_own_decode() -> None:
-    """A message that sizes a FixedVector first decodes through its own decode(), not the inline one."""
-    desc = descriptor_pb2.DescriptorProto(name="Sized")
-    field = desc.field.add(name="values", number=1, type=UINT32)
-    field.label = descriptor_pb2.FieldDescriptorProto.LABEL_REPEATED
-    field.options.Extensions[pb.fixed_vector] = True
-    header, cpp, _ = build_message_type(desc, {}, {"Sized": SOURCE_CLIENT})
-    assert (
-        "ProtoDecodableMessage::decode_fields(this, buffer, length, &decode_field);"
-        not in header
-    )
-    assert header.count("void decode(const uint8_t *buffer, size_t length);") == 1
-    assert "void Sized::decode(const uint8_t *buffer, size_t length) {" in cpp
-    assert "ProtoDecodableMessage::count_repeated_field(buffer, length, 1)" in cpp
-    assert (
-        cpp.count(
-            "ProtoDecodableMessage::decode_fields(this, buffer, length, &decode_field);"
-        )
-        == 1
-    )