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tweaks to reduce RAM

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This commit is contained in:
J. Nick Koston
2026-01-17 07:28:44 -10:00
parent c1e1325af2
commit 438bb96687
5 changed files with 16 additions and 15 deletions
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esphome/components/mqtt/custom_mqtt_device.cpp
+1 -1
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@@ -18,7 +18,7 @@ bool CustomMQTTDevice::publish(const std::string &topic, float value, int8_t num
}
bool CustomMQTTDevice::publish(const std::string &topic, int value) {
char buffer[24];
int len = snprintf(buffer, sizeof(buffer), "%d", value);
size_t len = buf_append_printf(buffer, sizeof(buffer), 0, "%d", value);
return global_mqtt_client->publish(topic, buffer, len);
}
bool CustomMQTTDevice::publish_json(const std::string &topic, const json::json_build_t &f, uint8_t qos, bool retain) {
esphome/components/mqtt/mqtt_client.cpp
+4 -2
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@@ -94,9 +94,11 @@ void MQTTClientComponent::send_device_info_() {
char key[8]; // "ip" + up to 3 digits + null
char ip_buf[network::IP_ADDRESS_BUFFER_SIZE];
if (index == 0) {
strcpy(key, "ip");
key[0] = 'i';
key[1] = 'p';
key[2] = '\0';
} else {
snprintf(key, sizeof(key), "ip%u", index);
buf_append_printf(key, sizeof(key), 0, "ip%u", index);
}
ip.str_to(ip_buf);
root[key] = ip_buf;
esphome/components/mqtt/mqtt_component.cpp
+9 -10
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@@ -189,13 +189,15 @@ bool MQTTComponent::send_discovery_() {
StringRef object_id = this->get_default_object_id_to_(object_id_buf);
if (discovery_info.unique_id_generator == MQTT_MAC_ADDRESS_UNIQUE_ID_GENERATOR) {
char friendly_name_hash[9];
snprintf(friendly_name_hash, sizeof(friendly_name_hash), "%08" PRIx32, fnv1_hash(this->friendly_name_()));
buf_append_printf(friendly_name_hash, sizeof(friendly_name_hash), 0, "%08" PRIx32,
fnv1_hash(this->friendly_name_()));
// Format: mac-component_type-hash (e.g. "aabbccddeeff-sensor-12345678")
// MAC (12) + "-" (1) + domain (max 20) + "-" (1) + hash (8) + null (1) = 43
char unique_id[MAC_ADDRESS_BUFFER_SIZE + ESPHOME_DOMAIN_MAX_LEN + 11];
char mac_buf[MAC_ADDRESS_BUFFER_SIZE];
get_mac_address_into_buffer(mac_buf);
snprintf(unique_id, sizeof(unique_id), "%s-%s-%s", mac_buf, this->component_type(), friendly_name_hash);
buf_append_printf(unique_id, sizeof(unique_id), 0, "%s-%s-%s", mac_buf, this->component_type(),
friendly_name_hash);
root[MQTT_UNIQUE_ID] = unique_id;
} else {
// default to almost-unique ID. It's a hack but the only way to get that
@@ -224,17 +226,14 @@ bool MQTTComponent::send_discovery_() {
model == nullptr ? ESPHOME_PROJECT_NAME : std::string(ESPHOME_PROJECT_NAME, model - ESPHOME_PROJECT_NAME);
#else
static const char ver_fmt[] PROGMEM = ESPHOME_VERSION " (config hash 0x%08" PRIx32 ")";
#ifdef USE_ESP8266
char fmt_buf[sizeof(ver_fmt)];
strcpy_P(fmt_buf, ver_fmt);
const char *fmt = fmt_buf;
#else
const char *fmt = ver_fmt;
#endif
// Buffer sized for format string expansion: ~4 bytes net growth from format specifier to 8 hex digits, plus
// safety margin
char version_buf[sizeof(ver_fmt) + 8];
snprintf(version_buf, sizeof(version_buf), fmt, App.get_config_hash());
#ifdef USE_ESP8266
snprintf_P(version_buf, sizeof(version_buf), ver_fmt, App.get_config_hash());
#else
snprintf(version_buf, sizeof(version_buf), ver_fmt, App.get_config_hash());
#endif
device_info[MQTT_DEVICE_SW_VERSION] = version_buf;
device_info[MQTT_DEVICE_MODEL] = ESPHOME_BOARD;
#if defined(USE_ESP8266) || defined(USE_ESP32)
esphome/components/mqtt/mqtt_fan.cpp
+1 -1
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@@ -175,7 +175,7 @@ bool MQTTFanComponent::publish_state() {
auto traits = this->state_->get_traits();
if (traits.supports_speed()) {
char buf[12];
int len = snprintf(buf, sizeof(buf), "%d", this->state_->speed);
size_t len = buf_append_printf(buf, sizeof(buf), 0, "%d", this->state_->speed);
bool success = this->publish(this->get_speed_level_state_topic(), buf, len);
failed = failed || !success;
}
esphome/components/mqtt/mqtt_number.cpp
+1 -1
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@@ -75,7 +75,7 @@ bool MQTTNumberComponent::send_initial_state() {
}
bool MQTTNumberComponent::publish_state(float value) {
char buffer[64];
snprintf(buffer, sizeof(buffer), "%f", value);
buf_append_printf(buffer, sizeof(buffer), 0, "%f", value);
return this->publish(this->get_state_topic_(), buffer);
}