[api] Encode entity names straight from flash

Extend the progmem proto option to string fields and mark the entity info
name field with it, so ListEntities copies the name once instead of through
a stack buffer.

esphome/components/api/api.proto

@@ -539,7 +539,7 @@ message ListEntitiesBinarySensorResponse {
 
   string object_id = 1 [(max_data_length) = 120, (force) = true];
   fixed32 key = 2 [(force) = true];
-  string name = 3 [(max_data_length) = 120, (force) = true];
+  string name = 3 [(max_data_length) = 120, (force) = true, (progmem) = true];
   reserved 4; // Deprecated: was string unique_id
 
   string device_class = 5 [(max_data_length) = 47];
@@ -573,7 +573,7 @@ message ListEntitiesCoverResponse {
 
   string object_id = 1 [(max_data_length) = 120, (force) = true];
   fixed32 key = 2 [(force) = true];
-  string name = 3 [(max_data_length) = 120, (force) = true];
+  string name = 3 [(max_data_length) = 120, (force) = true, (progmem) = true];
   reserved 4; // Deprecated: was string unique_id
 
   bool assumed_state = 5;
@@ -657,7 +657,7 @@ message ListEntitiesFanResponse {
 
   string object_id = 1 [(max_data_length) = 120, (force) = true];
   fixed32 key = 2 [(force) = true];
-  string name = 3 [(max_data_length) = 120, (force) = true];
+  string name = 3 [(max_data_length) = 120, (force) = true, (progmem) = true];
   reserved 4; // Deprecated: was string unique_id
 
   bool supports_oscillation = 5;
@@ -745,7 +745,7 @@ message ListEntitiesLightResponse {
 
   string object_id = 1 [(max_data_length) = 120, (force) = true];
   fixed32 key = 2 [(force) = true];
-  string name = 3 [(max_data_length) = 120, (force) = true];
+  string name = 3 [(max_data_length) = 120, (force) = true, (progmem) = true];
   reserved 4; // Deprecated: was string unique_id
 
   repeated ColorMode supported_color_modes = 12 [(container_pointer_no_template) = "light::ColorModeMask"];
@@ -850,7 +850,7 @@ message ListEntitiesSensorResponse {
 
   string object_id = 1 [(max_data_length) = 120, (force) = true];
   fixed32 key = 2 [(force) = true];
-  string name = 3 [(max_data_length) = 120, (force) = true];
+  string name = 3 [(max_data_length) = 120, (force) = true, (progmem) = true];
   reserved 4; // Deprecated: was string unique_id
 
   string icon = 5 [(field_ifdef) = "USE_ENTITY_ICON", (max_data_length) = 63];
@@ -891,7 +891,7 @@ message ListEntitiesSwitchResponse {
 
   string object_id = 1 [(max_data_length) = 120, (force) = true];
   fixed32 key = 2 [(force) = true];
-  string name = 3 [(max_data_length) = 120, (force) = true];
+  string name = 3 [(max_data_length) = 120, (force) = true, (progmem) = true];
   reserved 4; // Deprecated: was string unique_id
 
   string icon = 5 [(field_ifdef) = "USE_ENTITY_ICON", (max_data_length) = 63];
@@ -936,7 +936,7 @@ message ListEntitiesTextSensorResponse {
 
   string object_id = 1 [(max_data_length) = 120, (force) = true];
   fixed32 key = 2 [(force) = true];
-  string name = 3 [(max_data_length) = 120, (force) = true];
+  string name = 3 [(max_data_length) = 120, (force) = true, (progmem) = true];
   reserved 4; // Deprecated: was string unique_id
 
   string icon = 5 [(field_ifdef) = "USE_ENTITY_ICON", (max_data_length) = 63];
@@ -1207,7 +1207,7 @@ message ListEntitiesCameraResponse {
 
   string object_id = 1 [(max_data_length) = 120, (force) = true];
   fixed32 key = 2 [(force) = true];
-  string name = 3 [(max_data_length) = 120, (force) = true];
+  string name = 3 [(max_data_length) = 120, (force) = true, (progmem) = true];
   reserved 4; // Deprecated: was string unique_id
   bool disabled_by_default = 5;
   string icon = 6 [(field_ifdef) = "USE_ENTITY_ICON", (max_data_length) = 63];
@@ -1299,7 +1299,7 @@ message ListEntitiesClimateResponse {
 
   string object_id = 1 [(max_data_length) = 120, (force) = true];
   fixed32 key = 2 [(force) = true];
-  string name = 3 [(max_data_length) = 120, (force) = true];
+  string name = 3 [(max_data_length) = 120, (force) = true, (progmem) = true];
   reserved 4; // Deprecated: was string unique_id
 
   bool supports_current_temperature = 5; // Deprecated: use feature_flags
@@ -1414,7 +1414,7 @@ message ListEntitiesWaterHeaterResponse {
 
   string object_id = 1 [(max_data_length) = 120, (force) = true];
   fixed32 key = 2 [(force) = true];
-  string name = 3 [(max_data_length) = 120, (force) = true];
+  string name = 3 [(max_data_length) = 120, (force) = true, (progmem) = true];
   string icon = 4 [(field_ifdef) = "USE_ENTITY_ICON", (max_data_length) = 63];
   bool disabled_by_default = 5;
   EntityCategory entity_category = 6;
@@ -1494,7 +1494,7 @@ message ListEntitiesNumberResponse {
 
   string object_id = 1 [(max_data_length) = 120, (force) = true];
   fixed32 key = 2 [(force) = true];
-  string name = 3 [(max_data_length) = 120, (force) = true];
+  string name = 3 [(max_data_length) = 120, (force) = true, (progmem) = true];
   reserved 4; // Deprecated: was string unique_id
 
   string icon = 5 [(field_ifdef) = "USE_ENTITY_ICON", (max_data_length) = 63];
@@ -1543,7 +1543,7 @@ message ListEntitiesSelectResponse {
 
   string object_id = 1 [(max_data_length) = 120, (force) = true];
   fixed32 key = 2 [(force) = true];
-  string name = 3 [(max_data_length) = 120, (force) = true];
+  string name = 3 [(max_data_length) = 120, (force) = true, (progmem) = true];
   reserved 4; // Deprecated: was string unique_id
 
   string icon = 5 [(field_ifdef) = "USE_ENTITY_ICON", (max_data_length) = 63];
@@ -1587,7 +1587,7 @@ message ListEntitiesSirenResponse {
 
   string object_id = 1 [(max_data_length) = 120, (force) = true];
   fixed32 key = 2 [(force) = true];
-  string name = 3 [(max_data_length) = 120, (force) = true];
+  string name = 3 [(max_data_length) = 120, (force) = true, (progmem) = true];
   reserved 4; // Deprecated: was string unique_id
 
   string icon = 5 [(field_ifdef) = "USE_ENTITY_ICON", (max_data_length) = 63];
@@ -1652,7 +1652,7 @@ message ListEntitiesLockResponse {
 
   string object_id = 1 [(max_data_length) = 120, (force) = true];
   fixed32 key = 2 [(force) = true];
-  string name = 3 [(max_data_length) = 120, (force) = true];
+  string name = 3 [(max_data_length) = 120, (force) = true, (progmem) = true];
   reserved 4; // Deprecated: was string unique_id
 
   string icon = 5 [(field_ifdef) = "USE_ENTITY_ICON", (max_data_length) = 63];
@@ -1701,7 +1701,7 @@ message ListEntitiesButtonResponse {
 
   string object_id = 1 [(max_data_length) = 120, (force) = true];
   fixed32 key = 2 [(force) = true];
-  string name = 3 [(max_data_length) = 120, (force) = true];
+  string name = 3 [(max_data_length) = 120, (force) = true, (progmem) = true];
   reserved 4; // Deprecated: was string unique_id
 
   string icon = 5 [(field_ifdef) = "USE_ENTITY_ICON", (max_data_length) = 63];
@@ -1768,7 +1768,7 @@ message ListEntitiesMediaPlayerResponse {
 
   string object_id = 1 [(max_data_length) = 120, (force) = true];
   fixed32 key = 2 [(force) = true];
-  string name = 3 [(max_data_length) = 120, (force) = true];
+  string name = 3 [(max_data_length) = 120, (force) = true, (progmem) = true];
   reserved 4; // Deprecated: was string unique_id
 
   string icon = 5 [(field_ifdef) = "USE_ENTITY_ICON", (max_data_length) = 63];
@@ -2360,7 +2360,7 @@ message ListEntitiesAlarmControlPanelResponse {
 
   string object_id = 1 [(max_data_length) = 120, (force) = true];
   fixed32 key = 2 [(force) = true];
-  string name = 3 [(max_data_length) = 120, (force) = true];
+  string name = 3 [(max_data_length) = 120, (force) = true, (progmem) = true];
   reserved 4; // Deprecated: was string unique_id
   string icon = 5 [(field_ifdef) = "USE_ENTITY_ICON", (max_data_length) = 63];
   bool disabled_by_default = 6;
@@ -2407,7 +2407,7 @@ message ListEntitiesTextResponse {
 
   string object_id = 1 [(max_data_length) = 120, (force) = true];
   fixed32 key = 2 [(force) = true];
-  string name = 3 [(max_data_length) = 120, (force) = true];
+  string name = 3 [(max_data_length) = 120, (force) = true, (progmem) = true];
   reserved 4; // Deprecated: was string unique_id
   string icon = 5 [(field_ifdef) = "USE_ENTITY_ICON", (max_data_length) = 63];
   bool disabled_by_default = 6;
@@ -2455,7 +2455,7 @@ message ListEntitiesDateResponse {
 
   string object_id = 1 [(max_data_length) = 120, (force) = true];
   fixed32 key = 2 [(force) = true];
-  string name = 3 [(max_data_length) = 120, (force) = true];
+  string name = 3 [(max_data_length) = 120, (force) = true, (progmem) = true];
   reserved 4; // Deprecated: was string unique_id
 
   string icon = 5 [(field_ifdef) = "USE_ENTITY_ICON", (max_data_length) = 63];
@@ -2502,7 +2502,7 @@ message ListEntitiesTimeResponse {
 
   string object_id = 1 [(max_data_length) = 120, (force) = true];
   fixed32 key = 2 [(force) = true];
-  string name = 3 [(max_data_length) = 120, (force) = true];
+  string name = 3 [(max_data_length) = 120, (force) = true, (progmem) = true];
   reserved 4; // Deprecated: was string unique_id
 
   string icon = 5 [(field_ifdef) = "USE_ENTITY_ICON", (max_data_length) = 63];
@@ -2549,7 +2549,7 @@ message ListEntitiesEventResponse {
 
   string object_id = 1 [(max_data_length) = 120, (force) = true];
   fixed32 key = 2 [(force) = true];
-  string name = 3 [(max_data_length) = 120, (force) = true];
+  string name = 3 [(max_data_length) = 120, (force) = true, (progmem) = true];
   reserved 4; // Deprecated: was string unique_id
 
   string icon = 5 [(field_ifdef) = "USE_ENTITY_ICON", (max_data_length) = 63];
@@ -2580,7 +2580,7 @@ message ListEntitiesValveResponse {
 
   string object_id = 1 [(max_data_length) = 120, (force) = true];
   fixed32 key = 2 [(force) = true];
-  string name = 3 [(max_data_length) = 120, (force) = true];
+  string name = 3 [(max_data_length) = 120, (force) = true, (progmem) = true];
   reserved 4; // Deprecated: was string unique_id
 
   string icon = 5 [(field_ifdef) = "USE_ENTITY_ICON", (max_data_length) = 63];
@@ -2635,7 +2635,7 @@ message ListEntitiesDateTimeResponse {
 
   string object_id = 1 [(max_data_length) = 120, (force) = true];
   fixed32 key = 2 [(force) = true];
-  string name = 3 [(max_data_length) = 120, (force) = true];
+  string name = 3 [(max_data_length) = 120, (force) = true, (progmem) = true];
   reserved 4; // Deprecated: was string unique_id
 
   string icon = 5 [(field_ifdef) = "USE_ENTITY_ICON", (max_data_length) = 63];
@@ -2678,7 +2678,7 @@ message ListEntitiesUpdateResponse {
 
   string object_id = 1 [(max_data_length) = 120, (force) = true];
   fixed32 key = 2 [(force) = true];
-  string name = 3 [(max_data_length) = 120, (force) = true];
+  string name = 3 [(max_data_length) = 120, (force) = true, (progmem) = true];
   reserved 4; // Deprecated: was string unique_id
 
   string icon = 5 [(field_ifdef) = "USE_ENTITY_ICON", (max_data_length) = 63];
@@ -2778,7 +2778,7 @@ message ListEntitiesInfraredResponse {
 
   string object_id = 1 [(max_data_length) = 120, (force) = true];
   fixed32 key = 2 [(force) = true];
-  string name = 3 [(max_data_length) = 120, (force) = true];
+  string name = 3 [(max_data_length) = 120, (force) = true, (progmem) = true];
   string icon = 4 [(field_ifdef) = "USE_ENTITY_ICON", (max_data_length) = 63];
   bool disabled_by_default = 5;
   EntityCategory entity_category = 6;
@@ -2847,7 +2847,7 @@ message ListEntitiesRadioFrequencyResponse {
 
   string object_id = 1 [(max_data_length) = 120, (force) = true];
   fixed32 key = 2 [(force) = true];
-  string name = 3 [(max_data_length) = 120, (force) = true];
+  string name = 3 [(max_data_length) = 120, (force) = true, (progmem) = true];
   string icon = 4 [(field_ifdef) = "USE_ENTITY_ICON", (max_data_length) = 63];
   bool disabled_by_default = 5;
   EntityCategory entity_category = 6;

esphome/components/api/api_connection.cpp

@@ -473,9 +473,10 @@ uint16_t APIConnection::fill_and_encode_entity_info(EntityBase *entity, InfoResp
   // Set common fields that are shared by all entity types
   msg.key = entity->get_object_id_hash();
 
-  char name_buf[ENTITY_NAME_BUF_SIZE];
   if (entity->has_own_name()) {
-    msg.name = entity->get_name_to(name_buf);
+    // name is a progmem field, so it is encoded straight from flash
+    const ProgmemStringRef &name = entity->get_name_progmem();
+    msg.name = StringRef(name.progmem_ptr(), name.size());
   }
 
   // Set common EntityBase properties

esphome/components/api/api_options.proto

@@ -123,7 +123,7 @@ extend google.protobuf.FieldOptions {
     // from an absent one (e.g. a UTC ParsedTimezone, which is all zeros).
     optional bool track_presence = 50020 [default=false];
 
-    // progmem: The pointer_to_buffer bytes field points into flash (PROGMEM).
+    // progmem: The string field, or pointer_to_buffer bytes field, points into flash (PROGMEM).
     // The generated encode and dump copy it with progmem_memcpy, as ESP8266
     // cannot read flash with ordinary loads.
     optional bool progmem = 50021 [default=false];

esphome/components/api/api_pb2.cpp

@@ -401,7 +401,7 @@ uint8_t *ListEntitiesBinarySensorResponse::encode_msg(const void *self,
   const auto &msg = *static_cast<const ListEntitiesBinarySensorResponse *>(self);
   pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 10, msg.object_id);
   pos = ProtoEncode::write_tag_and_fixed32(pos PROTO_ENCODE_DEBUG_ARG, 21, msg.key);
-  pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
+  pos = ProtoEncode::encode_short_progmem_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
   pos = ProtoEncode::encode_string(pos PROTO_ENCODE_DEBUG_ARG, 5, msg.device_class);
   pos = ProtoEncode::encode_bool(pos PROTO_ENCODE_DEBUG_ARG, 6, msg.is_status_binary_sensor);
   pos = ProtoEncode::encode_bool(pos PROTO_ENCODE_DEBUG_ARG, 7, msg.disabled_by_default);
@@ -459,7 +459,7 @@ uint8_t *ListEntitiesCoverResponse::encode_msg(const void *self, uint8_t *__rest
   const auto &msg = *static_cast<const ListEntitiesCoverResponse *>(self);
   pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 10, msg.object_id);
   pos = ProtoEncode::write_tag_and_fixed32(pos PROTO_ENCODE_DEBUG_ARG, 21, msg.key);
-  pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
+  pos = ProtoEncode::encode_short_progmem_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
   pos = ProtoEncode::encode_bool(pos PROTO_ENCODE_DEBUG_ARG, 5, msg.assumed_state);
   pos = ProtoEncode::encode_bool(pos PROTO_ENCODE_DEBUG_ARG, 6, msg.supports_position);
   pos = ProtoEncode::encode_bool(pos PROTO_ENCODE_DEBUG_ARG, 7, msg.supports_tilt);
@@ -558,7 +558,7 @@ uint8_t *ListEntitiesFanResponse::encode_msg(const void *self, uint8_t *__restri
   const auto &msg = *static_cast<const ListEntitiesFanResponse *>(self);
   pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 10, msg.object_id);
   pos = ProtoEncode::write_tag_and_fixed32(pos PROTO_ENCODE_DEBUG_ARG, 21, msg.key);
-  pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
+  pos = ProtoEncode::encode_short_progmem_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
   pos = ProtoEncode::encode_bool(pos PROTO_ENCODE_DEBUG_ARG, 5, msg.supports_oscillation);
   pos = ProtoEncode::encode_bool(pos PROTO_ENCODE_DEBUG_ARG, 6, msg.supports_speed);
   pos = ProtoEncode::encode_bool(pos PROTO_ENCODE_DEBUG_ARG, 7, msg.supports_direction);
@@ -678,7 +678,7 @@ uint8_t *ListEntitiesLightResponse::encode_msg(const void *self, uint8_t *__rest
   const auto &msg = *static_cast<const ListEntitiesLightResponse *>(self);
   pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 10, msg.object_id);
   pos = ProtoEncode::write_tag_and_fixed32(pos PROTO_ENCODE_DEBUG_ARG, 21, msg.key);
-  pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
+  pos = ProtoEncode::encode_short_progmem_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
   for (const auto &it : *msg.supported_color_modes) {
     pos = ProtoEncode::encode_uint32_force(pos PROTO_ENCODE_DEBUG_ARG, 12, static_cast<uint32_t>(it));
   }
@@ -884,7 +884,7 @@ uint8_t *ListEntitiesSensorResponse::encode_msg(const void *self, uint8_t *__res
   const auto &msg = *static_cast<const ListEntitiesSensorResponse *>(self);
   pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 10, msg.object_id);
   pos = ProtoEncode::write_tag_and_fixed32(pos PROTO_ENCODE_DEBUG_ARG, 21, msg.key);
-  pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
+  pos = ProtoEncode::encode_short_progmem_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
 #ifdef USE_ENTITY_ICON
   pos = ProtoEncode::encode_string(pos PROTO_ENCODE_DEBUG_ARG, 5, msg.icon);
 #endif
@@ -954,7 +954,7 @@ uint8_t *ListEntitiesSwitchResponse::encode_msg(const void *self, uint8_t *__res
   const auto &msg = *static_cast<const ListEntitiesSwitchResponse *>(self);
   pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 10, msg.object_id);
   pos = ProtoEncode::write_tag_and_fixed32(pos PROTO_ENCODE_DEBUG_ARG, 21, msg.key);
-  pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
+  pos = ProtoEncode::encode_short_progmem_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
 #ifdef USE_ENTITY_ICON
   pos = ProtoEncode::encode_string(pos PROTO_ENCODE_DEBUG_ARG, 5, msg.icon);
 #endif
@@ -1030,7 +1030,7 @@ uint8_t *ListEntitiesTextSensorResponse::encode_msg(const void *self,
   const auto &msg = *static_cast<const ListEntitiesTextSensorResponse *>(self);
   pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 10, msg.object_id);
   pos = ProtoEncode::write_tag_and_fixed32(pos PROTO_ENCODE_DEBUG_ARG, 21, msg.key);
-  pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
+  pos = ProtoEncode::encode_short_progmem_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
 #ifdef USE_ENTITY_ICON
   pos = ProtoEncode::encode_string(pos PROTO_ENCODE_DEBUG_ARG, 5, msg.icon);
 #endif
@@ -1478,7 +1478,7 @@ uint8_t *ListEntitiesCameraResponse::encode_msg(const void *self, uint8_t *__res
   const auto &msg = *static_cast<const ListEntitiesCameraResponse *>(self);
   pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 10, msg.object_id);
   pos = ProtoEncode::write_tag_and_fixed32(pos PROTO_ENCODE_DEBUG_ARG, 21, msg.key);
-  pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
+  pos = ProtoEncode::encode_short_progmem_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
   pos = ProtoEncode::encode_bool(pos PROTO_ENCODE_DEBUG_ARG, 5, msg.disabled_by_default);
 #ifdef USE_ENTITY_ICON
   pos = ProtoEncode::encode_string(pos PROTO_ENCODE_DEBUG_ARG, 6, msg.icon);
@@ -1544,7 +1544,7 @@ uint8_t *ListEntitiesClimateResponse::encode_msg(const void *self, uint8_t *__re
   const auto &msg = *static_cast<const ListEntitiesClimateResponse *>(self);
   pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 10, msg.object_id);
   pos = ProtoEncode::write_tag_and_fixed32(pos PROTO_ENCODE_DEBUG_ARG, 21, msg.key);
-  pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
+  pos = ProtoEncode::encode_short_progmem_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
   pos = ProtoEncode::encode_bool(pos PROTO_ENCODE_DEBUG_ARG, 5, msg.supports_current_temperature);
   pos = ProtoEncode::encode_bool(pos PROTO_ENCODE_DEBUG_ARG, 6, msg.supports_two_point_target_temperature);
   for (const auto &it : *msg.supported_modes) {
@@ -1781,7 +1781,7 @@ uint8_t *ListEntitiesWaterHeaterResponse::encode_msg(const void *self,
   const auto &msg = *static_cast<const ListEntitiesWaterHeaterResponse *>(self);
   pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 10, msg.object_id);
   pos = ProtoEncode::write_tag_and_fixed32(pos PROTO_ENCODE_DEBUG_ARG, 21, msg.key);
-  pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
+  pos = ProtoEncode::encode_short_progmem_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
 #ifdef USE_ENTITY_ICON
   pos = ProtoEncode::encode_string(pos PROTO_ENCODE_DEBUG_ARG, 4, msg.icon);
 #endif
@@ -1908,7 +1908,7 @@ uint8_t *ListEntitiesNumberResponse::encode_msg(const void *self, uint8_t *__res
   const auto &msg = *static_cast<const ListEntitiesNumberResponse *>(self);
   pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 10, msg.object_id);
   pos = ProtoEncode::write_tag_and_fixed32(pos PROTO_ENCODE_DEBUG_ARG, 21, msg.key);
-  pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
+  pos = ProtoEncode::encode_short_progmem_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
 #ifdef USE_ENTITY_ICON
   pos = ProtoEncode::encode_string(pos PROTO_ENCODE_DEBUG_ARG, 5, msg.icon);
 #endif
@@ -1999,7 +1999,7 @@ uint8_t *ListEntitiesSelectResponse::encode_msg(const void *self, uint8_t *__res
   const auto &msg = *static_cast<const ListEntitiesSelectResponse *>(self);
   pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 10, msg.object_id);
   pos = ProtoEncode::write_tag_and_fixed32(pos PROTO_ENCODE_DEBUG_ARG, 21, msg.key);
-  pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
+  pos = ProtoEncode::encode_short_progmem_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
 #ifdef USE_ENTITY_ICON
   pos = ProtoEncode::encode_string(pos PROTO_ENCODE_DEBUG_ARG, 5, msg.icon);
 #endif
@@ -2078,7 +2078,7 @@ uint8_t *ListEntitiesSirenResponse::encode_msg(const void *self, uint8_t *__rest
   const auto &msg = *static_cast<const ListEntitiesSirenResponse *>(self);
   pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 10, msg.object_id);
   pos = ProtoEncode::write_tag_and_fixed32(pos PROTO_ENCODE_DEBUG_ARG, 21, msg.key);
-  pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
+  pos = ProtoEncode::encode_short_progmem_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
 #ifdef USE_ENTITY_ICON
   pos = ProtoEncode::encode_string(pos PROTO_ENCODE_DEBUG_ARG, 5, msg.icon);
 #endif
@@ -2180,7 +2180,7 @@ uint8_t *ListEntitiesLockResponse::encode_msg(const void *self, uint8_t *__restr
   const auto &msg = *static_cast<const ListEntitiesLockResponse *>(self);
   pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 10, msg.object_id);
   pos = ProtoEncode::write_tag_and_fixed32(pos PROTO_ENCODE_DEBUG_ARG, 21, msg.key);
-  pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
+  pos = ProtoEncode::encode_short_progmem_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
 #ifdef USE_ENTITY_ICON
   pos = ProtoEncode::encode_string(pos PROTO_ENCODE_DEBUG_ARG, 5, msg.icon);
 #endif
@@ -2263,7 +2263,7 @@ uint8_t *ListEntitiesButtonResponse::encode_msg(const void *self, uint8_t *__res
   const auto &msg = *static_cast<const ListEntitiesButtonResponse *>(self);
   pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 10, msg.object_id);
   pos = ProtoEncode::write_tag_and_fixed32(pos PROTO_ENCODE_DEBUG_ARG, 21, msg.key);
-  pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
+  pos = ProtoEncode::encode_short_progmem_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
 #ifdef USE_ENTITY_ICON
   pos = ProtoEncode::encode_string(pos PROTO_ENCODE_DEBUG_ARG, 5, msg.icon);
 #endif
@@ -2332,7 +2332,7 @@ uint8_t *ListEntitiesMediaPlayerResponse::encode_msg(const void *self,
   const auto &msg = *static_cast<const ListEntitiesMediaPlayerResponse *>(self);
   pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 10, msg.object_id);
   pos = ProtoEncode::write_tag_and_fixed32(pos PROTO_ENCODE_DEBUG_ARG, 21, msg.key);
-  pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
+  pos = ProtoEncode::encode_short_progmem_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
 #ifdef USE_ENTITY_ICON
   pos = ProtoEncode::encode_string(pos PROTO_ENCODE_DEBUG_ARG, 5, msg.icon);
 #endif
@@ -3178,7 +3178,7 @@ uint8_t *ListEntitiesAlarmControlPanelResponse::encode_msg(const void *self,
   const auto &msg = *static_cast<const ListEntitiesAlarmControlPanelResponse *>(self);
   pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 10, msg.object_id);
   pos = ProtoEncode::write_tag_and_fixed32(pos PROTO_ENCODE_DEBUG_ARG, 21, msg.key);
-  pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
+  pos = ProtoEncode::encode_short_progmem_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
 #ifdef USE_ENTITY_ICON
   pos = ProtoEncode::encode_string(pos PROTO_ENCODE_DEBUG_ARG, 5, msg.icon);
 #endif
@@ -3258,7 +3258,7 @@ uint8_t *ListEntitiesTextResponse::encode_msg(const void *self, uint8_t *__restr
   const auto &msg = *static_cast<const ListEntitiesTextResponse *>(self);
   pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 10, msg.object_id);
   pos = ProtoEncode::write_tag_and_fixed32(pos PROTO_ENCODE_DEBUG_ARG, 21, msg.key);
-  pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
+  pos = ProtoEncode::encode_short_progmem_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
 #ifdef USE_ENTITY_ICON
   pos = ProtoEncode::encode_string(pos PROTO_ENCODE_DEBUG_ARG, 5, msg.icon);
 #endif
@@ -3337,7 +3337,7 @@ uint8_t *ListEntitiesDateResponse::encode_msg(const void *self, uint8_t *__restr
   const auto &msg = *static_cast<const ListEntitiesDateResponse *>(self);
   pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 10, msg.object_id);
   pos = ProtoEncode::write_tag_and_fixed32(pos PROTO_ENCODE_DEBUG_ARG, 21, msg.key);
-  pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
+  pos = ProtoEncode::encode_short_progmem_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
 #ifdef USE_ENTITY_ICON
   pos = ProtoEncode::encode_string(pos PROTO_ENCODE_DEBUG_ARG, 5, msg.icon);
 #endif
@@ -3418,7 +3418,7 @@ uint8_t *ListEntitiesTimeResponse::encode_msg(const void *self, uint8_t *__restr
   const auto &msg = *static_cast<const ListEntitiesTimeResponse *>(self);
   pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 10, msg.object_id);
   pos = ProtoEncode::write_tag_and_fixed32(pos PROTO_ENCODE_DEBUG_ARG, 21, msg.key);
-  pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
+  pos = ProtoEncode::encode_short_progmem_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
 #ifdef USE_ENTITY_ICON
   pos = ProtoEncode::encode_string(pos PROTO_ENCODE_DEBUG_ARG, 5, msg.icon);
 #endif
@@ -3499,7 +3499,7 @@ uint8_t *ListEntitiesEventResponse::encode_msg(const void *self, uint8_t *__rest
   const auto &msg = *static_cast<const ListEntitiesEventResponse *>(self);
   pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 10, msg.object_id);
   pos = ProtoEncode::write_tag_and_fixed32(pos PROTO_ENCODE_DEBUG_ARG, 21, msg.key);
-  pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
+  pos = ProtoEncode::encode_short_progmem_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
 #ifdef USE_ENTITY_ICON
   pos = ProtoEncode::encode_string(pos PROTO_ENCODE_DEBUG_ARG, 5, msg.icon);
 #endif
@@ -3561,7 +3561,7 @@ uint8_t *ListEntitiesValveResponse::encode_msg(const void *self, uint8_t *__rest
   const auto &msg = *static_cast<const ListEntitiesValveResponse *>(self);
   pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 10, msg.object_id);
   pos = ProtoEncode::write_tag_and_fixed32(pos PROTO_ENCODE_DEBUG_ARG, 21, msg.key);
-  pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
+  pos = ProtoEncode::encode_short_progmem_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
 #ifdef USE_ENTITY_ICON
   pos = ProtoEncode::encode_string(pos PROTO_ENCODE_DEBUG_ARG, 5, msg.icon);
 #endif
@@ -3649,7 +3649,7 @@ uint8_t *ListEntitiesDateTimeResponse::encode_msg(const void *self,
   const auto &msg = *static_cast<const ListEntitiesDateTimeResponse *>(self);
   pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 10, msg.object_id);
   pos = ProtoEncode::write_tag_and_fixed32(pos PROTO_ENCODE_DEBUG_ARG, 21, msg.key);
-  pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
+  pos = ProtoEncode::encode_short_progmem_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
 #ifdef USE_ENTITY_ICON
   pos = ProtoEncode::encode_string(pos PROTO_ENCODE_DEBUG_ARG, 5, msg.icon);
 #endif
@@ -3722,7 +3722,7 @@ uint8_t *ListEntitiesUpdateResponse::encode_msg(const void *self, uint8_t *__res
   const auto &msg = *static_cast<const ListEntitiesUpdateResponse *>(self);
   pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 10, msg.object_id);
   pos = ProtoEncode::write_tag_and_fixed32(pos PROTO_ENCODE_DEBUG_ARG, 21, msg.key);
-  pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
+  pos = ProtoEncode::encode_short_progmem_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
 #ifdef USE_ENTITY_ICON
   pos = ProtoEncode::encode_string(pos PROTO_ENCODE_DEBUG_ARG, 5, msg.icon);
 #endif
@@ -3878,7 +3878,7 @@ uint8_t *ListEntitiesInfraredResponse::encode_msg(const void *self,
   const auto &msg = *static_cast<const ListEntitiesInfraredResponse *>(self);
   pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 10, msg.object_id);
   pos = ProtoEncode::write_tag_and_fixed32(pos PROTO_ENCODE_DEBUG_ARG, 21, msg.key);
-  pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
+  pos = ProtoEncode::encode_short_progmem_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
 #ifdef USE_ENTITY_ICON
   pos = ProtoEncode::encode_string(pos PROTO_ENCODE_DEBUG_ARG, 4, msg.icon);
 #endif
@@ -3996,7 +3996,7 @@ uint8_t *ListEntitiesRadioFrequencyResponse::encode_msg(const void *self,
   const auto &msg = *static_cast<const ListEntitiesRadioFrequencyResponse *>(self);
   pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 10, msg.object_id);
   pos = ProtoEncode::write_tag_and_fixed32(pos PROTO_ENCODE_DEBUG_ARG, 21, msg.key);
-  pos = ProtoEncode::encode_short_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
+  pos = ProtoEncode::encode_short_progmem_string_force(pos PROTO_ENCODE_DEBUG_ARG, 26, msg.name);
 #ifdef USE_ENTITY_ICON
   pos = ProtoEncode::encode_string(pos PROTO_ENCODE_DEBUG_ARG, 4, msg.icon);
 #endif

esphome/components/api/api_pb2_dump.cpp

@@ -134,6 +134,14 @@ static void dump_progmem_bytes_field(DumpBuffer &out, const char *field_name, co
   progmem_memcpy(data_buf, data, len);
   dump_bytes_field(out, field_name, data_buf, len, indent);
 }
+
+// Helper for string fields in flash: copies the shown characters out with progmem_memcpy first
+static void dump_progmem_string_field(DumpBuffer &out, const char *field_name, const StringRef &value, int indent = 2) {
+  char buf[DUMP_BYTES_MAX];
+  size_t len = std::min(value.size(), sizeof(buf));
+  progmem_memcpy(buf, value.c_str(), len);
+  dump_field(out, field_name, StringRef(buf, len), indent);
+}
 #pragma GCC diagnostic pop
 
 template<> const char *proto_enum_to_string<enums::DisconnectReason>(enums::DisconnectReason value) {
@@ -1182,7 +1190,7 @@ const char *ListEntitiesBinarySensorResponse::dump_to(DumpBuffer &out) const {
   MessageDumpHelper helper(out, ESPHOME_PSTR("ListEntitiesBinarySensorResponse"));
   dump_field(out, ESPHOME_PSTR("object_id"), this->object_id);
   dump_field(out, ESPHOME_PSTR("key"), this->key);
-  dump_field(out, ESPHOME_PSTR("name"), this->name);
+  dump_progmem_string_field(out, ESPHOME_PSTR("name"), this->name);
   dump_field(out, ESPHOME_PSTR("device_class"), this->device_class);
   dump_field(out, ESPHOME_PSTR("is_status_binary_sensor"), this->is_status_binary_sensor);
   dump_field(out, ESPHOME_PSTR("disabled_by_default"), this->disabled_by_default);
@@ -1211,7 +1219,7 @@ const char *ListEntitiesCoverResponse::dump_to(DumpBuffer &out) const {
   MessageDumpHelper helper(out, ESPHOME_PSTR("ListEntitiesCoverResponse"));
   dump_field(out, ESPHOME_PSTR("object_id"), this->object_id);
   dump_field(out, ESPHOME_PSTR("key"), this->key);
-  dump_field(out, ESPHOME_PSTR("name"), this->name);
+  dump_progmem_string_field(out, ESPHOME_PSTR("name"), this->name);
   dump_field(out, ESPHOME_PSTR("assumed_state"), this->assumed_state);
   dump_field(out, ESPHOME_PSTR("supports_position"), this->supports_position);
   dump_field(out, ESPHOME_PSTR("supports_tilt"), this->supports_tilt);
@@ -1257,7 +1265,7 @@ const char *ListEntitiesFanResponse::dump_to(DumpBuffer &out) const {
   MessageDumpHelper helper(out, ESPHOME_PSTR("ListEntitiesFanResponse"));
   dump_field(out, ESPHOME_PSTR("object_id"), this->object_id);
   dump_field(out, ESPHOME_PSTR("key"), this->key);
-  dump_field(out, ESPHOME_PSTR("name"), this->name);
+  dump_progmem_string_field(out, ESPHOME_PSTR("name"), this->name);
   dump_field(out, ESPHOME_PSTR("supports_oscillation"), this->supports_oscillation);
   dump_field(out, ESPHOME_PSTR("supports_speed"), this->supports_speed);
   dump_field(out, ESPHOME_PSTR("supports_direction"), this->supports_direction);
@@ -1312,7 +1320,7 @@ const char *ListEntitiesLightResponse::dump_to(DumpBuffer &out) const {
   MessageDumpHelper helper(out, ESPHOME_PSTR("ListEntitiesLightResponse"));
   dump_field(out, ESPHOME_PSTR("object_id"), this->object_id);
   dump_field(out, ESPHOME_PSTR("key"), this->key);
-  dump_field(out, ESPHOME_PSTR("name"), this->name);
+  dump_progmem_string_field(out, ESPHOME_PSTR("name"), this->name);
   for (const auto &it : *this->supported_color_modes) {
     dump_field(out, ESPHOME_PSTR("supported_color_modes"), static_cast<enums::ColorMode>(it), 4);
   }
@@ -1391,7 +1399,7 @@ const char *ListEntitiesSensorResponse::dump_to(DumpBuffer &out) const {
   MessageDumpHelper helper(out, ESPHOME_PSTR("ListEntitiesSensorResponse"));
   dump_field(out, ESPHOME_PSTR("object_id"), this->object_id);
   dump_field(out, ESPHOME_PSTR("key"), this->key);
-  dump_field(out, ESPHOME_PSTR("name"), this->name);
+  dump_progmem_string_field(out, ESPHOME_PSTR("name"), this->name);
 #ifdef USE_ENTITY_ICON
   dump_field(out, ESPHOME_PSTR("icon"), this->icon);
 #endif
@@ -1423,7 +1431,7 @@ const char *ListEntitiesSwitchResponse::dump_to(DumpBuffer &out) const {
   MessageDumpHelper helper(out, ESPHOME_PSTR("ListEntitiesSwitchResponse"));
   dump_field(out, ESPHOME_PSTR("object_id"), this->object_id);
   dump_field(out, ESPHOME_PSTR("key"), this->key);
-  dump_field(out, ESPHOME_PSTR("name"), this->name);
+  dump_progmem_string_field(out, ESPHOME_PSTR("name"), this->name);
 #ifdef USE_ENTITY_ICON
   dump_field(out, ESPHOME_PSTR("icon"), this->icon);
 #endif
@@ -1461,7 +1469,7 @@ const char *ListEntitiesTextSensorResponse::dump_to(DumpBuffer &out) const {
   MessageDumpHelper helper(out, ESPHOME_PSTR("ListEntitiesTextSensorResponse"));
   dump_field(out, ESPHOME_PSTR("object_id"), this->object_id);
   dump_field(out, ESPHOME_PSTR("key"), this->key);
-  dump_field(out, ESPHOME_PSTR("name"), this->name);
+  dump_progmem_string_field(out, ESPHOME_PSTR("name"), this->name);
 #ifdef USE_ENTITY_ICON
   dump_field(out, ESPHOME_PSTR("icon"), this->icon);
 #endif
@@ -1692,7 +1700,7 @@ const char *ListEntitiesCameraResponse::dump_to(DumpBuffer &out) const {
   MessageDumpHelper helper(out, ESPHOME_PSTR("ListEntitiesCameraResponse"));
   dump_field(out, ESPHOME_PSTR("object_id"), this->object_id);
   dump_field(out, ESPHOME_PSTR("key"), this->key);
-  dump_field(out, ESPHOME_PSTR("name"), this->name);
+  dump_progmem_string_field(out, ESPHOME_PSTR("name"), this->name);
   dump_field(out, ESPHOME_PSTR("disabled_by_default"), this->disabled_by_default);
 #ifdef USE_ENTITY_ICON
   dump_field(out, ESPHOME_PSTR("icon"), this->icon);
@@ -1725,7 +1733,7 @@ const char *ListEntitiesClimateResponse::dump_to(DumpBuffer &out) const {
   MessageDumpHelper helper(out, ESPHOME_PSTR("ListEntitiesClimateResponse"));
   dump_field(out, ESPHOME_PSTR("object_id"), this->object_id);
   dump_field(out, ESPHOME_PSTR("key"), this->key);
-  dump_field(out, ESPHOME_PSTR("name"), this->name);
+  dump_progmem_string_field(out, ESPHOME_PSTR("name"), this->name);
   dump_field(out, ESPHOME_PSTR("supports_current_temperature"), this->supports_current_temperature);
   dump_field(out, ESPHOME_PSTR("supports_two_point_target_temperature"), this->supports_two_point_target_temperature);
   for (const auto &it : *this->supported_modes) {
@@ -1823,7 +1831,7 @@ const char *ListEntitiesWaterHeaterResponse::dump_to(DumpBuffer &out) const {
   MessageDumpHelper helper(out, ESPHOME_PSTR("ListEntitiesWaterHeaterResponse"));
   dump_field(out, ESPHOME_PSTR("object_id"), this->object_id);
   dump_field(out, ESPHOME_PSTR("key"), this->key);
-  dump_field(out, ESPHOME_PSTR("name"), this->name);
+  dump_progmem_string_field(out, ESPHOME_PSTR("name"), this->name);
 #ifdef USE_ENTITY_ICON
   dump_field(out, ESPHOME_PSTR("icon"), this->icon);
 #endif
@@ -1877,7 +1885,7 @@ const char *ListEntitiesNumberResponse::dump_to(DumpBuffer &out) const {
   MessageDumpHelper helper(out, ESPHOME_PSTR("ListEntitiesNumberResponse"));
   dump_field(out, ESPHOME_PSTR("object_id"), this->object_id);
   dump_field(out, ESPHOME_PSTR("key"), this->key);
-  dump_field(out, ESPHOME_PSTR("name"), this->name);
+  dump_progmem_string_field(out, ESPHOME_PSTR("name"), this->name);
 #ifdef USE_ENTITY_ICON
   dump_field(out, ESPHOME_PSTR("icon"), this->icon);
 #endif
@@ -1919,7 +1927,7 @@ const char *ListEntitiesSelectResponse::dump_to(DumpBuffer &out) const {
   MessageDumpHelper helper(out, ESPHOME_PSTR("ListEntitiesSelectResponse"));
   dump_field(out, ESPHOME_PSTR("object_id"), this->object_id);
   dump_field(out, ESPHOME_PSTR("key"), this->key);
-  dump_field(out, ESPHOME_PSTR("name"), this->name);
+  dump_progmem_string_field(out, ESPHOME_PSTR("name"), this->name);
 #ifdef USE_ENTITY_ICON
   dump_field(out, ESPHOME_PSTR("icon"), this->icon);
 #endif
@@ -1958,7 +1966,7 @@ const char *ListEntitiesSirenResponse::dump_to(DumpBuffer &out) const {
   MessageDumpHelper helper(out, ESPHOME_PSTR("ListEntitiesSirenResponse"));
   dump_field(out, ESPHOME_PSTR("object_id"), this->object_id);
   dump_field(out, ESPHOME_PSTR("key"), this->key);
-  dump_field(out, ESPHOME_PSTR("name"), this->name);
+  dump_progmem_string_field(out, ESPHOME_PSTR("name"), this->name);
 #ifdef USE_ENTITY_ICON
   dump_field(out, ESPHOME_PSTR("icon"), this->icon);
 #endif
@@ -2005,7 +2013,7 @@ const char *ListEntitiesLockResponse::dump_to(DumpBuffer &out) const {
   MessageDumpHelper helper(out, ESPHOME_PSTR("ListEntitiesLockResponse"));
   dump_field(out, ESPHOME_PSTR("object_id"), this->object_id);
   dump_field(out, ESPHOME_PSTR("key"), this->key);
-  dump_field(out, ESPHOME_PSTR("name"), this->name);
+  dump_progmem_string_field(out, ESPHOME_PSTR("name"), this->name);
 #ifdef USE_ENTITY_ICON
   dump_field(out, ESPHOME_PSTR("icon"), this->icon);
 #endif
@@ -2046,7 +2054,7 @@ const char *ListEntitiesButtonResponse::dump_to(DumpBuffer &out) const {
   MessageDumpHelper helper(out, ESPHOME_PSTR("ListEntitiesButtonResponse"));
   dump_field(out, ESPHOME_PSTR("object_id"), this->object_id);
   dump_field(out, ESPHOME_PSTR("key"), this->key);
-  dump_field(out, ESPHOME_PSTR("name"), this->name);
+  dump_progmem_string_field(out, ESPHOME_PSTR("name"), this->name);
 #ifdef USE_ENTITY_ICON
   dump_field(out, ESPHOME_PSTR("icon"), this->icon);
 #endif
@@ -2081,7 +2089,7 @@ const char *ListEntitiesMediaPlayerResponse::dump_to(DumpBuffer &out) const {
   MessageDumpHelper helper(out, ESPHOME_PSTR("ListEntitiesMediaPlayerResponse"));
   dump_field(out, ESPHOME_PSTR("object_id"), this->object_id);
   dump_field(out, ESPHOME_PSTR("key"), this->key);
-  dump_field(out, ESPHOME_PSTR("name"), this->name);
+  dump_progmem_string_field(out, ESPHOME_PSTR("name"), this->name);
 #ifdef USE_ENTITY_ICON
   dump_field(out, ESPHOME_PSTR("icon"), this->icon);
 #endif
@@ -2471,7 +2479,7 @@ const char *ListEntitiesAlarmControlPanelResponse::dump_to(DumpBuffer &out) cons
   MessageDumpHelper helper(out, ESPHOME_PSTR("ListEntitiesAlarmControlPanelResponse"));
   dump_field(out, ESPHOME_PSTR("object_id"), this->object_id);
   dump_field(out, ESPHOME_PSTR("key"), this->key);
-  dump_field(out, ESPHOME_PSTR("name"), this->name);
+  dump_progmem_string_field(out, ESPHOME_PSTR("name"), this->name);
 #ifdef USE_ENTITY_ICON
   dump_field(out, ESPHOME_PSTR("icon"), this->icon);
 #endif
@@ -2510,7 +2518,7 @@ const char *ListEntitiesTextResponse::dump_to(DumpBuffer &out) const {
   MessageDumpHelper helper(out, ESPHOME_PSTR("ListEntitiesTextResponse"));
   dump_field(out, ESPHOME_PSTR("object_id"), this->object_id);
   dump_field(out, ESPHOME_PSTR("key"), this->key);
-  dump_field(out, ESPHOME_PSTR("name"), this->name);
+  dump_progmem_string_field(out, ESPHOME_PSTR("name"), this->name);
 #ifdef USE_ENTITY_ICON
   dump_field(out, ESPHOME_PSTR("icon"), this->icon);
 #endif
@@ -2550,7 +2558,7 @@ const char *ListEntitiesDateResponse::dump_to(DumpBuffer &out) const {
   MessageDumpHelper helper(out, ESPHOME_PSTR("ListEntitiesDateResponse"));
   dump_field(out, ESPHOME_PSTR("object_id"), this->object_id);
   dump_field(out, ESPHOME_PSTR("key"), this->key);
-  dump_field(out, ESPHOME_PSTR("name"), this->name);
+  dump_progmem_string_field(out, ESPHOME_PSTR("name"), this->name);
 #ifdef USE_ENTITY_ICON
   dump_field(out, ESPHOME_PSTR("icon"), this->icon);
 #endif
@@ -2590,7 +2598,7 @@ const char *ListEntitiesTimeResponse::dump_to(DumpBuffer &out) const {
   MessageDumpHelper helper(out, ESPHOME_PSTR("ListEntitiesTimeResponse"));
   dump_field(out, ESPHOME_PSTR("object_id"), this->object_id);
   dump_field(out, ESPHOME_PSTR("key"), this->key);
-  dump_field(out, ESPHOME_PSTR("name"), this->name);
+  dump_progmem_string_field(out, ESPHOME_PSTR("name"), this->name);
 #ifdef USE_ENTITY_ICON
   dump_field(out, ESPHOME_PSTR("icon"), this->icon);
 #endif
@@ -2630,7 +2638,7 @@ const char *ListEntitiesEventResponse::dump_to(DumpBuffer &out) const {
   MessageDumpHelper helper(out, ESPHOME_PSTR("ListEntitiesEventResponse"));
   dump_field(out, ESPHOME_PSTR("object_id"), this->object_id);
   dump_field(out, ESPHOME_PSTR("key"), this->key);
-  dump_field(out, ESPHOME_PSTR("name"), this->name);
+  dump_progmem_string_field(out, ESPHOME_PSTR("name"), this->name);
 #ifdef USE_ENTITY_ICON
   dump_field(out, ESPHOME_PSTR("icon"), this->icon);
 #endif
@@ -2660,7 +2668,7 @@ const char *ListEntitiesValveResponse::dump_to(DumpBuffer &out) const {
   MessageDumpHelper helper(out, ESPHOME_PSTR("ListEntitiesValveResponse"));
   dump_field(out, ESPHOME_PSTR("object_id"), this->object_id);
   dump_field(out, ESPHOME_PSTR("key"), this->key);
-  dump_field(out, ESPHOME_PSTR("name"), this->name);
+  dump_progmem_string_field(out, ESPHOME_PSTR("name"), this->name);
 #ifdef USE_ENTITY_ICON
   dump_field(out, ESPHOME_PSTR("icon"), this->icon);
 #endif
@@ -2702,7 +2710,7 @@ const char *ListEntitiesDateTimeResponse::dump_to(DumpBuffer &out) const {
   MessageDumpHelper helper(out, ESPHOME_PSTR("ListEntitiesDateTimeResponse"));
   dump_field(out, ESPHOME_PSTR("object_id"), this->object_id);
   dump_field(out, ESPHOME_PSTR("key"), this->key);
-  dump_field(out, ESPHOME_PSTR("name"), this->name);
+  dump_progmem_string_field(out, ESPHOME_PSTR("name"), this->name);
 #ifdef USE_ENTITY_ICON
   dump_field(out, ESPHOME_PSTR("icon"), this->icon);
 #endif
@@ -2738,7 +2746,7 @@ const char *ListEntitiesUpdateResponse::dump_to(DumpBuffer &out) const {
   MessageDumpHelper helper(out, ESPHOME_PSTR("ListEntitiesUpdateResponse"));
   dump_field(out, ESPHOME_PSTR("object_id"), this->object_id);
   dump_field(out, ESPHOME_PSTR("key"), this->key);
-  dump_field(out, ESPHOME_PSTR("name"), this->name);
+  dump_progmem_string_field(out, ESPHOME_PSTR("name"), this->name);
 #ifdef USE_ENTITY_ICON
   dump_field(out, ESPHOME_PSTR("icon"), this->icon);
 #endif
@@ -2801,7 +2809,7 @@ const char *ListEntitiesInfraredResponse::dump_to(DumpBuffer &out) const {
   MessageDumpHelper helper(out, ESPHOME_PSTR("ListEntitiesInfraredResponse"));
   dump_field(out, ESPHOME_PSTR("object_id"), this->object_id);
   dump_field(out, ESPHOME_PSTR("key"), this->key);
-  dump_field(out, ESPHOME_PSTR("name"), this->name);
+  dump_progmem_string_field(out, ESPHOME_PSTR("name"), this->name);
 #ifdef USE_ENTITY_ICON
   dump_field(out, ESPHOME_PSTR("icon"), this->icon);
 #endif
@@ -2859,7 +2867,7 @@ const char *ListEntitiesRadioFrequencyResponse::dump_to(DumpBuffer &out) const {
   MessageDumpHelper helper(out, ESPHOME_PSTR("ListEntitiesRadioFrequencyResponse"));
   dump_field(out, ESPHOME_PSTR("object_id"), this->object_id);
   dump_field(out, ESPHOME_PSTR("key"), this->key);
-  dump_field(out, ESPHOME_PSTR("name"), this->name);
+  dump_progmem_string_field(out, ESPHOME_PSTR("name"), this->name);
 #ifdef USE_ENTITY_ICON
   dump_field(out, ESPHOME_PSTR("icon"), this->icon);
 #endif

esphome/components/api/proto.h

@@ -418,6 +418,18 @@ class ProtoEncode {
     std::memcpy(pos + 2, ref.c_str(), ref.size());
     return pos + 2 + ref.size();
   }
+  /// encode_short_string_force for a string in flash (PROGMEM), read with progmem_memcpy.
+  [[nodiscard]] static inline uint8_t *encode_short_progmem_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_progmem_string_force: string exceeds max_data_length < 128");
+#endif
+    PROTO_ENCODE_CHECK_BOUNDS(pos, 2 + ref.size());
+    pos[0] = tag;
+    pos[1] = static_cast<uint8_t>(ref.size());
+    progmem_memcpy(pos + 2, ref.c_str(), ref.size());
+    return 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) {

esphome/core/entity_base.h

@@ -92,6 +92,9 @@ class EntityBase {
 
   bool name_equals(const StringRef &other) const { return this->name_.equals(other); }
 
+  /// The name as stored, for consumers that read flash themselves (e.g. API progmem fields).
+  const ProgmemStringRef &get_name_progmem() const { return this->name_; }
+
   /// Copy the name into buf (null terminated), returns its length.
   size_t write_name_to(char *buf, size_t buf_size) const { return this->name_.write_to(buf, buf_size); }
 

script/api_protobuf/api_protobuf.py

@@ -538,13 +538,18 @@ def create_field_type_info(
         )
     if get_field_opt(field, pb.progmem, False) and (
         field.label == FieldDescriptorProto.LABEL_REPEATED
-        or field.type != 12
-        or not get_field_opt(field, pb.pointer_to_buffer, False)
-        or get_field_opt(field, pb.fixed_array_size) is not None
+        or (
+            field.type != 9
+            and (
+                field.type != 12
+                or not get_field_opt(field, pb.pointer_to_buffer, False)
+                or get_field_opt(field, pb.fixed_array_size) is not None
+            )
+        )
     ):
         raise ValueError(
-            f"progmem on field '{field.name}' requires a non-repeated bytes field "
-            "with pointer_to_buffer"
+            f"progmem on field '{field.name}' requires a non-repeated string field, "
+            "or a bytes field with pointer_to_buffer"
         )
     if field.label == FieldDescriptorProto.LABEL_REPEATED:
         # Check if this is a packed_buffer field (zero-copy packed repeated)
@@ -1250,6 +1255,11 @@ class PointerToStringBufferType(PointerToBufferTypeBase):
         one zero fill. Any encode path that copies unconditionally must check this."""
         return not self._needs_decode and not self.force
 
+    @property
+    def progmem(self) -> bool:
+        """Whether the string is in flash, so encode and dump copy it with progmem_memcpy."""
+        return get_field_opt(self._field, pb.progmem, False)
+
     @property
     def public_content(self) -> list[str]:
         if self._starts_null:
@@ -1267,9 +1277,20 @@ class PointerToStringBufferType(PointerToBufferTypeBase):
             )
             tag = self.calculate_tag()
             if tag < 128:
-                return _encode_call(
-                    "encode_short_string_force", str(tag), f"this->{self.field_name}"
+                encode_fn = (
+                    "encode_short_progmem_string_force"
+                    if self.progmem
+                    else "encode_short_string_force"
                 )
+                return _encode_call(encode_fn, str(tag), f"this->{self.field_name}")
+        if self.progmem:
+            return _encode_call(
+                "encode_progmem_bytes",
+                str(self.number),
+                f"reinterpret_cast<const uint8_t *>(this->{self.field_name}.c_str())",
+                f"this->{self.field_name}.size()",
+                force=self.force,
+            )
         if result := self._encode_bytes_with_precomputed_tag(
             f"this->{self.field_name}.c_str()",
             f"this->{self.field_name}.size()",
@@ -1297,6 +1318,8 @@ class PointerToStringBufferType(PointerToBufferTypeBase):
 
     @property
     def dump_content(self) -> str:
+        if self.progmem:
+            return f'dump_progmem_string_field(out, ESPHOME_PSTR("{self.name}"), this->{self.field_name});'
         return f'dump_field(out, ESPHOME_PSTR("{self.name}"), this->{self.field_name});'
 
     def get_size_calculation(self, name: str, force: bool = False) -> str:
@@ -3368,6 +3391,15 @@ static void dump_progmem_bytes_field(DumpBuffer &out, const char *field_name, co
   progmem_memcpy(data_buf, data, len);
   dump_bytes_field(out, field_name, data_buf, len, indent);
 }
+
+// Helper for string fields in flash: copies the shown characters out with progmem_memcpy first
+static void dump_progmem_string_field(DumpBuffer &out, const char *field_name, const StringRef &value,
+                                      int indent = 2) {
+  char buf[DUMP_BYTES_MAX];
+  size_t len = std::min(value.size(), sizeof(buf));
+  progmem_memcpy(buf, value.c_str(), len);
+  dump_field(out, field_name, StringRef(buf, len), indent);
+}
 #pragma GCC diagnostic pop
 
 """

tests/unit_tests/components/api/test_api_protobuf_generator.py

@@ -408,8 +408,30 @@ def test_progmem_rejected_in_a_decoded_message() -> None:
 
 
 def test_progmem_rejected_on_non_bytes_field() -> None:
-    """(progmem) only applies to bytes fields."""
-    field = _field(9)
+    """(progmem) only applies to string and bytes fields."""
+    field = _field(13)
     field.options.Extensions[pb.progmem] = True
     with pytest.raises(ValueError, match="progmem on field 'value'"):
         create_field_type_info(field, needs_decode=False)
+
+
+@pytest.mark.parametrize(
+    ("force", "max_len", "encode_fn"),
+    [
+        (True, 120, "encode_short_progmem_string_force("),
+        (False, None, "encode_progmem_bytes("),
+        (True, None, "encode_progmem_bytes_force("),
+    ],
+)
+def test_progmem_string_field_copies_from_flash(
+    force: bool, max_len: int | None, encode_fn: str
+) -> None:
+    """A (progmem) string field encodes and dumps through the progmem_memcpy helpers."""
+    field = _field(9, force=force)
+    field.options.Extensions[pb.progmem] = True
+    if max_len is not None:
+        field.options.Extensions[pb.max_data_length] = max_len
+    ti = create_field_type_info(field, needs_decode=False)
+    assert encode_fn in ti.encode_content
+    assert "encode_string" not in ti.encode_content
+    assert "dump_progmem_string_field(" in ti.dump_content