mqtt_sensor.cpp

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#include <cinttypes>
#include "mqtt_sensor.h"
#include "esphome/core/log.h"
#include "esphome/core/progmem.h"
 
#include "mqtt_const.h"
 
#ifdef USE_MQTT
#ifdef USE_SENSOR
 
#ifdef USE_DEEP_SLEEP
#include "esphome/components/deep_sleep/deep_sleep_component.h"
#endif
 
namespace esphome::mqtt {
 
static const char *const TAG = "mqtt.sensor";
 
using namespace esphome::sensor;
 
MQTTSensorComponent::MQTTSensorComponent(Sensor *sensor) : sensor_(sensor) {}
 
void MQTTSensorComponent::setup() {
  this->sensor_->add_on_state_callback([this](float state) { this->publish_state(state); });
}
 
void MQTTSensorComponent::dump_config() {
  ESP_LOGCONFIG(TAG, "MQTT Sensor '%s':", this->sensor_->get_name().c_str());
  if (this->get_expire_after() > 0) {
    ESP_LOGCONFIG(TAG, "  Expire After: %" PRIu32 "s", this->get_expire_after() / 1000);
  }
  LOG_MQTT_COMPONENT(true, false);
}
 
MQTT_COMPONENT_TYPE(MQTTSensorComponent, "sensor")
const EntityBase *MQTTSensorComponent::get_entity() const { return this->sensor_; }
 
uint32_t MQTTSensorComponent::get_expire_after() const {
  if (this->expire_after_.has_value())
    return *this->expire_after_;
  return 0;
}
 
void MQTTSensorComponent::send_discovery(JsonObject root, mqtt::SendDiscoveryConfig &config) {
  // NOLINTBEGIN(clang-analyzer-cplusplus.NewDeleteLeaks) false positive with ArduinoJson
  if (this->sensor_->has_accuracy_decimals()) {
    root[MQTT_SUGGESTED_DISPLAY_PRECISION] = this->sensor_->get_accuracy_decimals();
  }
 
  const auto unit_of_measurement = this->sensor_->get_unit_of_measurement_ref();
  if (!unit_of_measurement.empty()) {
    root[MQTT_UNIT_OF_MEASUREMENT] = unit_of_measurement;
  }
  // NOLINTEND(clang-analyzer-cplusplus.NewDeleteLeaks)
 
  if (this->get_expire_after() > 0)
    root[MQTT_EXPIRE_AFTER] = this->get_expire_after() / 1000;
 
  if (this->sensor_->get_force_update())
    root[MQTT_FORCE_UPDATE] = true;
 
  if (this->sensor_->get_state_class() != STATE_CLASS_NONE) {
    root[MQTT_STATE_CLASS] = reinterpret_cast<ProgmemStr>(state_class_to_string(this->sensor_->get_state_class()));
  }
 
  config.command_topic = false;
}
bool MQTTSensorComponent::send_initial_state() {
  if (this->sensor_->has_state()) {
    return this->publish_state(this->sensor_->state);
  } else {
    return true;
  }
}
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_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_to_(topic_buf), buf, len);
}
 
}  // namespace esphome::mqtt
 
#endif
#endif  // USE_MQTT