[mqtt] Refactor state publishing with dedicated enum-to-string helpers

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

esphome/components/mhz19/mhz19.cpp

@@ -155,6 +155,9 @@ void MHZ19Component::dump_config() {
     case MHZ19_DETECTION_RANGE_0_10000PPM:
       range_str = "0 to 10000ppm";
       break;
+    default:
+      range_str = "default";
+      break;
   }
   ESP_LOGCONFIG(TAG, "  Detection range: %s", range_str);
 }

esphome/components/mqtt/mqtt_alarm_control_panel.cpp

@@ -1,5 +1,6 @@
 #include "mqtt_alarm_control_panel.h"
 #include "esphome/core/log.h"
+#include "esphome/core/progmem.h"
 
 #include "mqtt_const.h"
 
@@ -12,6 +13,33 @@ static const char *const TAG = "mqtt.alarm_control_panel";
 
 using namespace esphome::alarm_control_panel;
 
+static ProgmemStr alarm_state_to_mqtt_str(AlarmControlPanelState state) {
+  switch (state) {
+    case ACP_STATE_DISARMED:
+      return ESPHOME_F("disarmed");
+    case ACP_STATE_ARMED_HOME:
+      return ESPHOME_F("armed_home");
+    case ACP_STATE_ARMED_AWAY:
+      return ESPHOME_F("armed_away");
+    case ACP_STATE_ARMED_NIGHT:
+      return ESPHOME_F("armed_night");
+    case ACP_STATE_ARMED_VACATION:
+      return ESPHOME_F("armed_vacation");
+    case ACP_STATE_ARMED_CUSTOM_BYPASS:
+      return ESPHOME_F("armed_custom_bypass");
+    case ACP_STATE_PENDING:
+      return ESPHOME_F("pending");
+    case ACP_STATE_ARMING:
+      return ESPHOME_F("arming");
+    case ACP_STATE_DISARMING:
+      return ESPHOME_F("disarming");
+    case ACP_STATE_TRIGGERED:
+      return ESPHOME_F("triggered");
+    default:
+      return ESPHOME_F("unknown");
+  }
+}
+
 MQTTAlarmControlPanelComponent::MQTTAlarmControlPanelComponent(AlarmControlPanel *alarm_control_panel)
     : alarm_control_panel_(alarm_control_panel) {}
 void MQTTAlarmControlPanelComponent::setup() {
@@ -84,42 +112,9 @@ const EntityBase *MQTTAlarmControlPanelComponent::get_entity() const { return th
 
 bool MQTTAlarmControlPanelComponent::send_initial_state() { return this->publish_state(); }
 bool MQTTAlarmControlPanelComponent::publish_state() {
-  const char *state_s;
-  switch (this->alarm_control_panel_->get_state()) {
-    case ACP_STATE_DISARMED:
-      state_s = "disarmed";
-      break;
-    case ACP_STATE_ARMED_HOME:
-      state_s = "armed_home";
-      break;
-    case ACP_STATE_ARMED_AWAY:
-      state_s = "armed_away";
-      break;
-    case ACP_STATE_ARMED_NIGHT:
-      state_s = "armed_night";
-      break;
-    case ACP_STATE_ARMED_VACATION:
-      state_s = "armed_vacation";
-      break;
-    case ACP_STATE_ARMED_CUSTOM_BYPASS:
-      state_s = "armed_custom_bypass";
-      break;
-    case ACP_STATE_PENDING:
-      state_s = "pending";
-      break;
-    case ACP_STATE_ARMING:
-      state_s = "arming";
-      break;
-    case ACP_STATE_DISARMING:
-      state_s = "disarming";
-      break;
-    case ACP_STATE_TRIGGERED:
-      state_s = "triggered";
-      break;
-    default:
-      state_s = "unknown";
-  }
-  return this->publish(this->get_state_topic_(), state_s);
+  char topic_buf[MQTT_DEFAULT_TOPIC_MAX_LEN];
+  return this->publish(this->get_state_topic_to_(topic_buf),
+                       alarm_state_to_mqtt_str(this->alarm_control_panel_->get_state()));
 }
 
 }  // namespace esphome::mqtt

esphome/components/mqtt/mqtt_binary_sensor.cpp

@@ -52,8 +52,9 @@ bool MQTTBinarySensorComponent::publish_state(bool state) {
   if (this->binary_sensor_->is_status_binary_sensor())
     return true;
 
+  char topic_buf[MQTT_DEFAULT_TOPIC_MAX_LEN];
   const char *state_s = state ? "ON" : "OFF";
-  return this->publish(this->get_state_topic_(), state_s);
+  return this->publish(this->get_state_topic_to_(topic_buf), state_s);
 }
 
 }  // namespace esphome::mqtt

esphome/components/mqtt/mqtt_climate.cpp

@@ -1,5 +1,6 @@
 #include "mqtt_climate.h"
 #include "esphome/core/log.h"
+#include "esphome/core/progmem.h"
 
 #include "mqtt_const.h"
 
@@ -12,6 +13,111 @@ static const char *const TAG = "mqtt.climate";
 
 using namespace esphome::climate;
 
+static ProgmemStr climate_mode_to_mqtt_str(ClimateMode mode) {
+  switch (mode) {
+    case CLIMATE_MODE_OFF:
+      return ESPHOME_F("off");
+    case CLIMATE_MODE_HEAT_COOL:
+      return ESPHOME_F("heat_cool");
+    case CLIMATE_MODE_AUTO:
+      return ESPHOME_F("auto");
+    case CLIMATE_MODE_COOL:
+      return ESPHOME_F("cool");
+    case CLIMATE_MODE_HEAT:
+      return ESPHOME_F("heat");
+    case CLIMATE_MODE_FAN_ONLY:
+      return ESPHOME_F("fan_only");
+    case CLIMATE_MODE_DRY:
+      return ESPHOME_F("dry");
+    default:
+      return ESPHOME_F("unknown");
+  }
+}
+
+static ProgmemStr climate_action_to_mqtt_str(ClimateAction action) {
+  switch (action) {
+    case CLIMATE_ACTION_OFF:
+      return ESPHOME_F("off");
+    case CLIMATE_ACTION_COOLING:
+      return ESPHOME_F("cooling");
+    case CLIMATE_ACTION_HEATING:
+      return ESPHOME_F("heating");
+    case CLIMATE_ACTION_IDLE:
+      return ESPHOME_F("idle");
+    case CLIMATE_ACTION_DRYING:
+      return ESPHOME_F("drying");
+    case CLIMATE_ACTION_FAN:
+      return ESPHOME_F("fan");
+    default:
+      return ESPHOME_F("unknown");
+  }
+}
+
+static ProgmemStr climate_fan_mode_to_mqtt_str(ClimateFanMode fan_mode) {
+  switch (fan_mode) {
+    case CLIMATE_FAN_ON:
+      return ESPHOME_F("on");
+    case CLIMATE_FAN_OFF:
+      return ESPHOME_F("off");
+    case CLIMATE_FAN_AUTO:
+      return ESPHOME_F("auto");
+    case CLIMATE_FAN_LOW:
+      return ESPHOME_F("low");
+    case CLIMATE_FAN_MEDIUM:
+      return ESPHOME_F("medium");
+    case CLIMATE_FAN_HIGH:
+      return ESPHOME_F("high");
+    case CLIMATE_FAN_MIDDLE:
+      return ESPHOME_F("middle");
+    case CLIMATE_FAN_FOCUS:
+      return ESPHOME_F("focus");
+    case CLIMATE_FAN_DIFFUSE:
+      return ESPHOME_F("diffuse");
+    case CLIMATE_FAN_QUIET:
+      return ESPHOME_F("quiet");
+    default:
+      return ESPHOME_F("unknown");
+  }
+}
+
+static ProgmemStr climate_swing_mode_to_mqtt_str(ClimateSwingMode swing_mode) {
+  switch (swing_mode) {
+    case CLIMATE_SWING_OFF:
+      return ESPHOME_F("off");
+    case CLIMATE_SWING_BOTH:
+      return ESPHOME_F("both");
+    case CLIMATE_SWING_VERTICAL:
+      return ESPHOME_F("vertical");
+    case CLIMATE_SWING_HORIZONTAL:
+      return ESPHOME_F("horizontal");
+    default:
+      return ESPHOME_F("unknown");
+  }
+}
+
+static ProgmemStr climate_preset_to_mqtt_str(ClimatePreset preset) {
+  switch (preset) {
+    case CLIMATE_PRESET_NONE:
+      return ESPHOME_F("none");
+    case CLIMATE_PRESET_HOME:
+      return ESPHOME_F("home");
+    case CLIMATE_PRESET_ECO:
+      return ESPHOME_F("eco");
+    case CLIMATE_PRESET_AWAY:
+      return ESPHOME_F("away");
+    case CLIMATE_PRESET_BOOST:
+      return ESPHOME_F("boost");
+    case CLIMATE_PRESET_COMFORT:
+      return ESPHOME_F("comfort");
+    case CLIMATE_PRESET_SLEEP:
+      return ESPHOME_F("sleep");
+    case CLIMATE_PRESET_ACTIVITY:
+      return ESPHOME_F("activity");
+    default:
+      return ESPHOME_F("unknown");
+  }
+}
+
 void MQTTClimateComponent::send_discovery(JsonObject root, mqtt::SendDiscoveryConfig &config) {
   // NOLINTBEGIN(clang-analyzer-cplusplus.NewDeleteLeaks) false positive with ArduinoJson
   auto traits = this->device_->get_traits();
@@ -260,34 +366,8 @@ const EntityBase *MQTTClimateComponent::get_entity() const { return this->device
 bool MQTTClimateComponent::publish_state_() {
   auto traits = this->device_->get_traits();
   // mode
-  const char *mode_s;
-  switch (this->device_->mode) {
-    case CLIMATE_MODE_OFF:
-      mode_s = "off";
-      break;
-    case CLIMATE_MODE_AUTO:
-      mode_s = "auto";
-      break;
-    case CLIMATE_MODE_COOL:
-      mode_s = "cool";
-      break;
-    case CLIMATE_MODE_HEAT:
-      mode_s = "heat";
-      break;
-    case CLIMATE_MODE_FAN_ONLY:
-      mode_s = "fan_only";
-      break;
-    case CLIMATE_MODE_DRY:
-      mode_s = "dry";
-      break;
-    case CLIMATE_MODE_HEAT_COOL:
-      mode_s = "heat_cool";
-      break;
-    default:
-      mode_s = "unknown";
-  }
   bool success = true;
-  if (!this->publish(this->get_mode_state_topic(), mode_s))
+  if (!this->publish(this->get_mode_state_topic(), climate_mode_to_mqtt_str(this->device_->mode)))
     success = false;
   int8_t target_accuracy = traits.get_target_temperature_accuracy_decimals();
   int8_t current_accuracy = traits.get_current_temperature_accuracy_decimals();
@@ -327,134 +407,37 @@ bool MQTTClimateComponent::publish_state_() {
   }
 
   if (traits.get_supports_presets() || !traits.get_supported_custom_presets().empty()) {
-    std::string payload;
-    if (this->device_->preset.has_value()) {
-      switch (this->device_->preset.value()) {
-        case CLIMATE_PRESET_NONE:
-          payload = "none";
-          break;
-        case CLIMATE_PRESET_HOME:
-          payload = "home";
-          break;
-        case CLIMATE_PRESET_AWAY:
-          payload = "away";
-          break;
-        case CLIMATE_PRESET_BOOST:
-          payload = "boost";
-          break;
-        case CLIMATE_PRESET_COMFORT:
-          payload = "comfort";
-          break;
-        case CLIMATE_PRESET_ECO:
-          payload = "eco";
-          break;
-        case CLIMATE_PRESET_SLEEP:
-          payload = "sleep";
-          break;
-        case CLIMATE_PRESET_ACTIVITY:
-          payload = "activity";
-          break;
-        default:
-          payload = "unknown";
-      }
-    }
-    if (this->device_->has_custom_preset())
-      payload = this->device_->get_custom_preset().c_str();
-    if (!this->publish(this->get_preset_state_topic(), payload))
+    if (this->device_->has_custom_preset()) {
+      if (!this->publish(this->get_preset_state_topic(), this->device_->get_custom_preset()))
+        success = false;
+    } else if (this->device_->preset.has_value()) {
+      if (!this->publish(this->get_preset_state_topic(), climate_preset_to_mqtt_str(this->device_->preset.value())))
+        success = false;
+    } else if (!this->publish(this->get_preset_state_topic(), "")) {
       success = false;
+    }
   }
 
   if (traits.has_feature_flags(climate::CLIMATE_SUPPORTS_ACTION)) {
-    const char *payload;
-    switch (this->device_->action) {
-      case CLIMATE_ACTION_OFF:
-        payload = "off";
-        break;
-      case CLIMATE_ACTION_COOLING:
-        payload = "cooling";
-        break;
-      case CLIMATE_ACTION_HEATING:
-        payload = "heating";
-        break;
-      case CLIMATE_ACTION_IDLE:
-        payload = "idle";
-        break;
-      case CLIMATE_ACTION_DRYING:
-        payload = "drying";
-        break;
-      case CLIMATE_ACTION_FAN:
-        payload = "fan";
-        break;
-      default:
-        payload = "unknown";
-    }
-    if (!this->publish(this->get_action_state_topic(), payload))
+    if (!this->publish(this->get_action_state_topic(), climate_action_to_mqtt_str(this->device_->action)))
       success = false;
   }
 
   if (traits.get_supports_fan_modes()) {
-    std::string payload;
-    if (this->device_->fan_mode.has_value()) {
-      switch (this->device_->fan_mode.value()) {
-        case CLIMATE_FAN_ON:
-          payload = "on";
-          break;
-        case CLIMATE_FAN_OFF:
-          payload = "off";
-          break;
-        case CLIMATE_FAN_AUTO:
-          payload = "auto";
-          break;
-        case CLIMATE_FAN_LOW:
-          payload = "low";
-          break;
-        case CLIMATE_FAN_MEDIUM:
-          payload = "medium";
-          break;
-        case CLIMATE_FAN_HIGH:
-          payload = "high";
-          break;
-        case CLIMATE_FAN_MIDDLE:
-          payload = "middle";
-          break;
-        case CLIMATE_FAN_FOCUS:
-          payload = "focus";
-          break;
-        case CLIMATE_FAN_DIFFUSE:
-          payload = "diffuse";
-          break;
-        case CLIMATE_FAN_QUIET:
-          payload = "quiet";
-          break;
-        default:
-          payload = "unknown";
-      }
-    }
-    if (this->device_->has_custom_fan_mode())
-      payload = this->device_->get_custom_fan_mode().c_str();
-    if (!this->publish(this->get_fan_mode_state_topic(), payload))
+    if (this->device_->has_custom_fan_mode()) {
+      if (!this->publish(this->get_fan_mode_state_topic(), this->device_->get_custom_fan_mode()))
+        success = false;
+    } else if (this->device_->fan_mode.has_value()) {
+      if (!this->publish(this->get_fan_mode_state_topic(),
+                         climate_fan_mode_to_mqtt_str(this->device_->fan_mode.value())))
+        success = false;
+    } else if (!this->publish(this->get_fan_mode_state_topic(), "")) {
       success = false;
+    }
   }
 
   if (traits.get_supports_swing_modes()) {
-    const char *payload;
-    switch (this->device_->swing_mode) {
-      case CLIMATE_SWING_OFF:
-        payload = "off";
-        break;
-      case CLIMATE_SWING_BOTH:
-        payload = "both";
-        break;
-      case CLIMATE_SWING_VERTICAL:
-        payload = "vertical";
-        break;
-      case CLIMATE_SWING_HORIZONTAL:
-        payload = "horizontal";
-        break;
-      default:
-        payload = "unknown";
-    }
-    if (!this->publish(this->get_swing_mode_state_topic(), payload))
+    if (!this->publish(this->get_swing_mode_state_topic(), climate_swing_mode_to_mqtt_str(this->device_->swing_mode)))
       success = false;
   }
 

esphome/components/mqtt/mqtt_component.cpp

@@ -5,6 +5,7 @@
 #include "esphome/core/application.h"
 #include "esphome/core/helpers.h"
 #include "esphome/core/log.h"
+#include "esphome/core/progmem.h"
 #include "esphome/core/version.h"
 
 #include "mqtt_const.h"
@@ -132,17 +133,45 @@ std::string MQTTComponent::get_command_topic_() const {
 }
 
 bool MQTTComponent::publish(const std::string &topic, const std::string &payload) {
-  return this->publish(topic, payload.data(), payload.size());
+  return this->publish(topic.c_str(), payload.data(), payload.size());
 }
 
 bool MQTTComponent::publish(const std::string &topic, const char *payload, size_t payload_length) {
-  if (topic.empty())
+  return this->publish(topic.c_str(), payload, payload_length);
+}
+
+bool MQTTComponent::publish(const char *topic, const char *payload, size_t payload_length) {
+  if (topic[0] == '\0')
     return false;
   return global_mqtt_client->publish(topic, payload, payload_length, this->qos_, this->retain_);
 }
 
+bool MQTTComponent::publish(const char *topic, const char *payload) {
+  return this->publish(topic, payload, strlen(payload));
+}
+
+#ifdef USE_ESP8266
+bool MQTTComponent::publish(const std::string &topic, ProgmemStr payload) {
+  return this->publish(topic.c_str(), payload);
+}
+
+bool MQTTComponent::publish(const char *topic, ProgmemStr payload) {
+  if (topic[0] == '\0')
+    return false;
+  // On ESP8266, ProgmemStr is __FlashStringHelper* - need to copy from flash
+  char buf[64];
+  strncpy_P(buf, reinterpret_cast<const char *>(payload), sizeof(buf) - 1);
+  buf[sizeof(buf) - 1] = '\0';
+  return global_mqtt_client->publish(topic, buf, strlen(buf), this->qos_, this->retain_);
+}
+#endif
+
 bool MQTTComponent::publish_json(const std::string &topic, const json::json_build_t &f) {
-  if (topic.empty())
+  return this->publish_json(topic.c_str(), f);
+}
+
+bool MQTTComponent::publish_json(const char *topic, const json::json_build_t &f) {
+  if (topic[0] == '\0')
     return false;
   return global_mqtt_client->publish_json(topic, f, this->qos_, this->retain_);
 }

esphome/components/mqtt/mqtt_component.h

@@ -9,6 +9,7 @@
 #include "esphome/core/automation.h"
 #include "esphome/core/component.h"
 #include "esphome/core/entity_base.h"
+#include "esphome/core/progmem.h"
 #include "esphome/core/string_ref.h"
 #include "mqtt_client.h"
 
@@ -157,6 +158,70 @@ class MQTTComponent : public Component {
    */
   bool publish(const std::string &topic, const char *payload, size_t payload_length);
 
+  /** Send a MQTT message.
+   *
+   * @param topic The topic.
+   * @param payload The null-terminated payload.
+   */
+  bool publish(const std::string &topic, const char *payload) {
+    return this->publish(topic.c_str(), payload, strlen(payload));
+  }
+
+  /** Send a MQTT message (no heap allocation for topic).
+   *
+   * @param topic The topic as C string.
+   * @param payload The payload buffer.
+   * @param payload_length The length of the payload.
+   */
+  bool publish(const char *topic, const char *payload, size_t payload_length);
+
+  /** Send a MQTT message (no heap allocation for topic).
+   *
+   * @param topic The topic as StringRef (for use with get_state_topic_to_()).
+   * @param payload The payload buffer.
+   * @param payload_length The length of the payload.
+   */
+  bool publish(StringRef topic, const char *payload, size_t payload_length) {
+    return this->publish(topic.c_str(), payload, payload_length);
+  }
+
+  /** Send a MQTT message (no heap allocation for topic).
+   *
+   * @param topic The topic as C string.
+   * @param payload The null-terminated payload.
+   */
+  bool publish(const char *topic, const char *payload);
+
+  /** Send a MQTT message (no heap allocation for topic).
+   *
+   * @param topic The topic as StringRef (for use with get_state_topic_to_()).
+   * @param payload The null-terminated payload.
+   */
+  bool publish(StringRef topic, const char *payload) { return this->publish(topic.c_str(), payload); }
+
+#ifdef USE_ESP8266
+  /** Send a MQTT message with a PROGMEM string payload.
+   *
+   * @param topic The topic.
+   * @param payload The payload (ProgmemStr - stored in flash on ESP8266).
+   */
+  bool publish(const std::string &topic, ProgmemStr payload);
+
+  /** Send a MQTT message with a PROGMEM string payload (no heap allocation for topic).
+   *
+   * @param topic The topic as C string.
+   * @param payload The payload (ProgmemStr - stored in flash on ESP8266).
+   */
+  bool publish(const char *topic, ProgmemStr payload);
+
+  /** Send a MQTT message with a PROGMEM string payload (no heap allocation for topic).
+   *
+   * @param topic The topic as StringRef (for use with get_state_topic_to_()).
+   * @param payload The payload (ProgmemStr - stored in flash on ESP8266).
+   */
+  bool publish(StringRef topic, ProgmemStr payload) { return this->publish(topic.c_str(), payload); }
+#endif
+
   /** Construct and send a JSON MQTT message.
    *
    * @param topic The topic.
@@ -164,6 +229,20 @@ class MQTTComponent : public Component {
    */
   bool publish_json(const std::string &topic, const json::json_build_t &f);
 
+  /** Construct and send a JSON MQTT message (no heap allocation for topic).
+   *
+   * @param topic The topic as C string.
+   * @param f The Json Message builder.
+   */
+  bool publish_json(const char *topic, const json::json_build_t &f);
+
+  /** Construct and send a JSON MQTT message (no heap allocation for topic).
+   *
+   * @param topic The topic as StringRef (for use with get_state_topic_to_()).
+   * @param f The Json Message builder.
+   */
+  bool publish_json(StringRef topic, const json::json_build_t &f) { return this->publish_json(topic.c_str(), f); }
+
   /** Subscribe to a MQTT topic.
    *
    * @param topic The topic. Wildcards are currently not supported.

esphome/components/mqtt/mqtt_cover.cpp

@@ -1,5 +1,6 @@
 #include "mqtt_cover.h"
 #include "esphome/core/log.h"
+#include "esphome/core/progmem.h"
 
 #include "mqtt_const.h"
 
@@ -12,6 +13,20 @@ static const char *const TAG = "mqtt.cover";
 
 using namespace esphome::cover;
 
+static ProgmemStr cover_state_to_mqtt_str(CoverOperation operation, float position, bool supports_position) {
+  if (operation == COVER_OPERATION_OPENING)
+    return ESPHOME_F("opening");
+  if (operation == COVER_OPERATION_CLOSING)
+    return ESPHOME_F("closing");
+  if (position == COVER_CLOSED)
+    return ESPHOME_F("closed");
+  if (position == COVER_OPEN)
+    return ESPHOME_F("open");
+  if (supports_position)
+    return ESPHOME_F("open");
+  return ESPHOME_F("unknown");
+}
+
 MQTTCoverComponent::MQTTCoverComponent(Cover *cover) : cover_(cover) {}
 void MQTTCoverComponent::setup() {
   auto traits = this->cover_->get_traits();
@@ -109,13 +124,10 @@ bool MQTTCoverComponent::publish_state() {
     if (!this->publish(this->get_tilt_state_topic(), pos, len))
       success = false;
   }
-  const char *state_s = this->cover_->current_operation == COVER_OPERATION_OPENING   ? "opening"
-                        : this->cover_->current_operation == COVER_OPERATION_CLOSING ? "closing"
-                        : this->cover_->position == COVER_CLOSED                     ? "closed"
-                        : this->cover_->position == COVER_OPEN                       ? "open"
-                        : traits.get_supports_position()                             ? "open"
-                                                                                     : "unknown";
-  if (!this->publish(this->get_state_topic_(), state_s))
+  char topic_buf[MQTT_DEFAULT_TOPIC_MAX_LEN];
+  if (!this->publish(this->get_state_topic_to_(topic_buf),
+                     cover_state_to_mqtt_str(this->cover_->current_operation, this->cover_->position,
+                                             traits.get_supports_position())))
     success = false;
   return success;
 }

esphome/components/mqtt/mqtt_date.cpp

@@ -53,7 +53,8 @@ bool MQTTDateComponent::send_initial_state() {
   }
 }
 bool MQTTDateComponent::publish_state(uint16_t year, uint8_t month, uint8_t day) {
-  return this->publish_json(this->get_state_topic_(), [year, month, day](JsonObject root) {
+  char topic_buf[MQTT_DEFAULT_TOPIC_MAX_LEN];
+  return this->publish_json(this->get_state_topic_to_(topic_buf), [year, month, day](JsonObject root) {
     // NOLINTNEXTLINE(clang-analyzer-cplusplus.NewDeleteLeaks) false positive with ArduinoJson
     root[ESPHOME_F("year")] = year;
     root[ESPHOME_F("month")] = month;

esphome/components/mqtt/mqtt_datetime.cpp

@@ -66,15 +66,17 @@ bool MQTTDateTimeComponent::send_initial_state() {
 }
 bool MQTTDateTimeComponent::publish_state(uint16_t year, uint8_t month, uint8_t day, uint8_t hour, uint8_t minute,
                                           uint8_t second) {
-  return this->publish_json(this->get_state_topic_(), [year, month, day, hour, minute, second](JsonObject root) {
-    // NOLINTNEXTLINE(clang-analyzer-cplusplus.NewDeleteLeaks) false positive with ArduinoJson
-    root[ESPHOME_F("year")] = year;
-    root[ESPHOME_F("month")] = month;
-    root[ESPHOME_F("day")] = day;
-    root[ESPHOME_F("hour")] = hour;
-    root[ESPHOME_F("minute")] = minute;
-    root[ESPHOME_F("second")] = second;
-  });
+  char topic_buf[MQTT_DEFAULT_TOPIC_MAX_LEN];
+  return this->publish_json(this->get_state_topic_to_(topic_buf),
+                            [year, month, day, hour, minute, second](JsonObject root) {
+                              // NOLINTNEXTLINE(clang-analyzer-cplusplus.NewDeleteLeaks) false positive with ArduinoJson
+                              root[ESPHOME_F("year")] = year;
+                              root[ESPHOME_F("month")] = month;
+                              root[ESPHOME_F("day")] = day;
+                              root[ESPHOME_F("hour")] = hour;
+                              root[ESPHOME_F("minute")] = minute;
+                              root[ESPHOME_F("second")] = second;
+                            });
 }
 
 }  // namespace esphome::mqtt

esphome/components/mqtt/mqtt_event.cpp

@@ -44,7 +44,8 @@ void MQTTEventComponent::dump_config() {
 }
 
 bool MQTTEventComponent::publish_event_(const std::string &event_type) {
-  return this->publish_json(this->get_state_topic_(), [event_type](JsonObject root) {
+  char topic_buf[MQTT_DEFAULT_TOPIC_MAX_LEN];
+  return this->publish_json(this->get_state_topic_to_(topic_buf), [event_type](JsonObject root) {
     // NOLINTNEXTLINE(clang-analyzer-cplusplus.NewDeleteLeaks) false positive with ArduinoJson
     root[MQTT_EVENT_TYPE] = event_type;
   });

esphome/components/mqtt/mqtt_fan.cpp

@@ -1,5 +1,6 @@
 #include "mqtt_fan.h"
 #include "esphome/core/log.h"
+#include "esphome/core/progmem.h"
 
 #include "mqtt_const.h"
 
@@ -12,6 +13,14 @@ static const char *const TAG = "mqtt.fan";
 
 using namespace esphome::fan;
 
+static ProgmemStr fan_direction_to_mqtt_str(FanDirection direction) {
+  return direction == FanDirection::FORWARD ? ESPHOME_F("forward") : ESPHOME_F("reverse");
+}
+
+static ProgmemStr fan_oscillation_to_mqtt_str(bool oscillating) {
+  return oscillating ? ESPHOME_F("oscillate_on") : ESPHOME_F("oscillate_off");
+}
+
 MQTTFanComponent::MQTTFanComponent(Fan *state) : state_(state) {}
 
 Fan *MQTTFanComponent::get_state() const { return this->state_; }
@@ -158,18 +167,18 @@ void MQTTFanComponent::send_discovery(JsonObject root, mqtt::SendDiscoveryConfig
   }
 }
 bool MQTTFanComponent::publish_state() {
+  char topic_buf[MQTT_DEFAULT_TOPIC_MAX_LEN];
   const char *state_s = this->state_->state ? "ON" : "OFF";
   ESP_LOGD(TAG, "'%s' Sending state %s.", this->state_->get_name().c_str(), state_s);
-  this->publish(this->get_state_topic_(), state_s);
+  this->publish(this->get_state_topic_to_(topic_buf), state_s);
   bool failed = false;
   if (this->state_->get_traits().supports_direction()) {
-    bool success = this->publish(this->get_direction_state_topic(),
-                                 this->state_->direction == fan::FanDirection::FORWARD ? "forward" : "reverse");
+    bool success = this->publish(this->get_direction_state_topic(), fan_direction_to_mqtt_str(this->state_->direction));
     failed = failed || !success;
   }
   if (this->state_->get_traits().supports_oscillation()) {
-    bool success = this->publish(this->get_oscillation_state_topic(),
-                                 this->state_->oscillating ? "oscillate_on" : "oscillate_off");
+    bool success =
+        this->publish(this->get_oscillation_state_topic(), fan_oscillation_to_mqtt_str(this->state_->oscillating));
     failed = failed || !success;
   }
   auto traits = this->state_->get_traits();

esphome/components/mqtt/mqtt_light.cpp

@@ -34,7 +34,8 @@ void MQTTJSONLightComponent::on_light_remote_values_update() {
 MQTTJSONLightComponent::MQTTJSONLightComponent(LightState *state) : state_(state) {}
 
 bool MQTTJSONLightComponent::publish_state_() {
-  return this->publish_json(this->get_state_topic_(), [this](JsonObject root) {
+  char topic_buf[MQTT_DEFAULT_TOPIC_MAX_LEN];
+  return this->publish_json(this->get_state_topic_to_(topic_buf), [this](JsonObject root) {
     // NOLINTNEXTLINE(clang-analyzer-cplusplus.NewDeleteLeaks) false positive with ArduinoJson
     LightJSONSchema::dump_json(*this->state_, root);
   });

esphome/components/mqtt/mqtt_lock.cpp

@@ -47,13 +47,14 @@ void MQTTLockComponent::send_discovery(JsonObject root, mqtt::SendDiscoveryConfi
 bool MQTTLockComponent::send_initial_state() { return this->publish_state(); }
 
 bool MQTTLockComponent::publish_state() {
+  char topic_buf[MQTT_DEFAULT_TOPIC_MAX_LEN];
 #ifdef USE_STORE_LOG_STR_IN_FLASH
   char buf[LOCK_STATE_STR_SIZE];
   strncpy_P(buf, (PGM_P) lock_state_to_string(this->lock_->state), sizeof(buf) - 1);
   buf[sizeof(buf) - 1] = '\0';
-  return this->publish(this->get_state_topic_(), buf);
+  return this->publish(this->get_state_topic_to_(topic_buf), buf);
 #else
-  return this->publish(this->get_state_topic_(), LOG_STR_ARG(lock_state_to_string(this->lock_->state)));
+  return this->publish(this->get_state_topic_to_(topic_buf), LOG_STR_ARG(lock_state_to_string(this->lock_->state)));
 #endif
 }
 

esphome/components/mqtt/mqtt_number.cpp

@@ -74,9 +74,10 @@ bool MQTTNumberComponent::send_initial_state() {
   }
 }
 bool MQTTNumberComponent::publish_state(float value) {
+  char topic_buf[MQTT_DEFAULT_TOPIC_MAX_LEN];
   char buffer[64];
-  buf_append_printf(buffer, sizeof(buffer), 0, "%f", value);
-  return this->publish(this->get_state_topic_(), buffer);
+  size_t len = buf_append_printf(buffer, sizeof(buffer), 0, "%f", value);
+  return this->publish(this->get_state_topic_to_(topic_buf), buffer, len);
 }
 
 }  // namespace esphome::mqtt

esphome/components/mqtt/mqtt_select.cpp

@@ -50,7 +50,8 @@ bool MQTTSelectComponent::send_initial_state() {
   }
 }
 bool MQTTSelectComponent::publish_state(const std::string &value) {
-  return this->publish(this->get_state_topic_(), value);
+  char topic_buf[MQTT_DEFAULT_TOPIC_MAX_LEN];
+  return this->publish(this->get_state_topic_to_(topic_buf), value.data(), value.size());
 }
 
 }  // namespace esphome::mqtt

esphome/components/mqtt/mqtt_sensor.cpp

@@ -79,12 +79,13 @@ bool MQTTSensorComponent::send_initial_state() {
   }
 }
 bool MQTTSensorComponent::publish_state(float value) {
+  char topic_buf[MQTT_DEFAULT_TOPIC_MAX_LEN];
   if (mqtt::global_mqtt_client->is_publish_nan_as_none() && std::isnan(value))
-    return this->publish(this->get_state_topic_(), "None", 4);
+    return this->publish(this->get_state_topic_to_(topic_buf), "None", 4);
   int8_t accuracy = this->sensor_->get_accuracy_decimals();
   char buf[VALUE_ACCURACY_MAX_LEN];
   size_t len = value_accuracy_to_buf(buf, value, accuracy);
-  return this->publish(this->get_state_topic_(), buf, len);
+  return this->publish(this->get_state_topic_to_(topic_buf), buf, len);
 }
 
 }  // namespace esphome::mqtt

esphome/components/mqtt/mqtt_switch.cpp

@@ -52,8 +52,9 @@ void MQTTSwitchComponent::send_discovery(JsonObject root, mqtt::SendDiscoveryCon
 bool MQTTSwitchComponent::send_initial_state() { return this->publish_state(this->switch_->state); }
 
 bool MQTTSwitchComponent::publish_state(bool state) {
+  char topic_buf[MQTT_DEFAULT_TOPIC_MAX_LEN];
   const char *state_s = state ? "ON" : "OFF";
-  return this->publish(this->get_state_topic_(), state_s);
+  return this->publish(this->get_state_topic_to_(topic_buf), state_s);
 }
 
 }  // namespace esphome::mqtt

esphome/components/mqtt/mqtt_text.cpp

@@ -53,7 +53,8 @@ bool MQTTTextComponent::send_initial_state() {
   }
 }
 bool MQTTTextComponent::publish_state(const std::string &value) {
-  return this->publish(this->get_state_topic_(), value);
+  char topic_buf[MQTT_DEFAULT_TOPIC_MAX_LEN];
+  return this->publish(this->get_state_topic_to_(topic_buf), value.data(), value.size());
 }
 
 }  // namespace esphome::mqtt

esphome/components/mqtt/mqtt_text_sensor.cpp

@@ -31,7 +31,10 @@ void MQTTTextSensor::dump_config() {
   LOG_MQTT_COMPONENT(true, false);
 }
 
-bool MQTTTextSensor::publish_state(const std::string &value) { return this->publish(this->get_state_topic_(), value); }
+bool MQTTTextSensor::publish_state(const std::string &value) {
+  char topic_buf[MQTT_DEFAULT_TOPIC_MAX_LEN];
+  return this->publish(this->get_state_topic_to_(topic_buf), value.data(), value.size());
+}
 bool MQTTTextSensor::send_initial_state() {
   if (this->sensor_->has_state()) {
     return this->publish_state(this->sensor_->state);

esphome/components/mqtt/mqtt_time.cpp

@@ -53,7 +53,8 @@ bool MQTTTimeComponent::send_initial_state() {
   }
 }
 bool MQTTTimeComponent::publish_state(uint8_t hour, uint8_t minute, uint8_t second) {
-  return this->publish_json(this->get_state_topic_(), [hour, minute, second](JsonObject root) {
+  char topic_buf[MQTT_DEFAULT_TOPIC_MAX_LEN];
+  return this->publish_json(this->get_state_topic_to_(topic_buf), [hour, minute, second](JsonObject root) {
     // NOLINTNEXTLINE(clang-analyzer-cplusplus.NewDeleteLeaks) false positive with ArduinoJson
     root[ESPHOME_F("hour")] = hour;
     root[ESPHOME_F("minute")] = minute;

esphome/components/mqtt/mqtt_update.cpp

@@ -28,7 +28,8 @@ void MQTTUpdateComponent::setup() {
 }
 
 bool MQTTUpdateComponent::publish_state() {
-  return this->publish_json(this->get_state_topic_(), [this](JsonObject root) {
+  char topic_buf[MQTT_DEFAULT_TOPIC_MAX_LEN];
+  return this->publish_json(this->get_state_topic_to_(topic_buf), [this](JsonObject root) {
     root[ESPHOME_F("installed_version")] = this->update_->update_info.current_version;
     root[ESPHOME_F("latest_version")] = this->update_->update_info.latest_version;
     root[ESPHOME_F("title")] = this->update_->update_info.title;

esphome/components/mqtt/mqtt_valve.cpp

@@ -1,5 +1,6 @@
 #include "mqtt_valve.h"
 #include "esphome/core/log.h"
+#include "esphome/core/progmem.h"
 
 #include "mqtt_const.h"
 
@@ -12,6 +13,20 @@ static const char *const TAG = "mqtt.valve";
 
 using namespace esphome::valve;
 
+static ProgmemStr valve_state_to_mqtt_str(ValveOperation operation, float position, bool supports_position) {
+  if (operation == VALVE_OPERATION_OPENING)
+    return ESPHOME_F("opening");
+  if (operation == VALVE_OPERATION_CLOSING)
+    return ESPHOME_F("closing");
+  if (position == VALVE_CLOSED)
+    return ESPHOME_F("closed");
+  if (position == VALVE_OPEN)
+    return ESPHOME_F("open");
+  if (supports_position)
+    return ESPHOME_F("open");
+  return ESPHOME_F("unknown");
+}
+
 MQTTValveComponent::MQTTValveComponent(Valve *valve) : valve_(valve) {}
 void MQTTValveComponent::setup() {
   auto traits = this->valve_->get_traits();
@@ -78,13 +93,10 @@ bool MQTTValveComponent::publish_state() {
     if (!this->publish(this->get_position_state_topic(), pos, len))
       success = false;
   }
-  const char *state_s = this->valve_->current_operation == VALVE_OPERATION_OPENING   ? "opening"
-                        : this->valve_->current_operation == VALVE_OPERATION_CLOSING ? "closing"
-                        : this->valve_->position == VALVE_CLOSED                     ? "closed"
-                        : this->valve_->position == VALVE_OPEN                       ? "open"
-                        : traits.get_supports_position()                             ? "open"
-                                                                                     : "unknown";
-  if (!this->publish(this->get_state_topic_(), state_s))
+  char topic_buf[MQTT_DEFAULT_TOPIC_MAX_LEN];
+  if (!this->publish(this->get_state_topic_to_(topic_buf),
+                     valve_state_to_mqtt_str(this->valve_->current_operation, this->valve_->position,
+                                             traits.get_supports_position())))
     success = false;
   return success;
 }