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Use PROGMEM format strings to reduce RAM usage on ESP8266

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Replace str_sprintf() with snprintf_P() and PSTR() to keep format
strings in flash instead of RAM. Also removes 'config hash 0x' prefix
to save additional bytes.
This commit is contained in:
David Woodhouse
2025-12-16 18:10:08 +00:00
parent 38167c268f
commit da67c47a76
2 changed files with 8 additions and 5 deletions
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5
esphome/components/mqtt/mqtt_component.cpp
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@@ -154,8 +154,9 @@ bool MQTTComponent::send_discovery_() {
device_info[MQTT_DEVICE_MANUFACTURER] =
model == nullptr ? ESPHOME_PROJECT_NAME : std::string(ESPHOME_PROJECT_NAME, model - ESPHOME_PROJECT_NAME);
#else
device_info[MQTT_DEVICE_SW_VERSION] =
str_sprintf(ESPHOME_VERSION " (config hash 0x%08" PRIx32 ")", App.get_config_hash());
char sw_version[64];
snprintf_P(sw_version, sizeof(sw_version), PSTR(ESPHOME_VERSION " (%08" PRIx32 ")"), App.get_config_hash());
device_info[MQTT_DEVICE_SW_VERSION] = sw_version;
device_info[MQTT_DEVICE_MODEL] = ESPHOME_BOARD;
#if defined(USE_ESP8266) || defined(USE_ESP32)
device_info[MQTT_DEVICE_MANUFACTURER] = "Espressif";

8
esphome/components/version/version_text_sensor.cpp
View File

@@ -10,14 +10,16 @@ namespace version {
static const char *const TAG = "version.text_sensor";
void VersionTextSensor::setup() {
char version_str[128];
if (this->hide_timestamp_) {
this->publish_state(str_sprintf(ESPHOME_VERSION " (config hash 0x%08" PRIx32 ")", App.get_config_hash()));
snprintf_P(version_str, sizeof(version_str), PSTR(ESPHOME_VERSION " (%08" PRIx32 ")"), App.get_config_hash());
} else {
char build_time_str[esphome::Application::BUILD_TIME_STR_SIZE];
App.get_build_time_string(build_time_str);
this->publish_state(str_sprintf(ESPHOME_VERSION " (config hash 0x%08" PRIx32 ", built: %s)", App.get_config_hash(),
build_time_str));
snprintf_P(version_str, sizeof(version_str), PSTR(ESPHOME_VERSION " (%08" PRIx32 ", built: %s)"),
App.get_config_hash(), build_time_str);
}
this->publish_state(version_str);
}
float VersionTextSensor::get_setup_priority() const { return setup_priority::DATA; }
void VersionTextSensor::set_hide_timestamp(bool hide_timestamp) { this->hide_timestamp_ = hide_timestamp; }