atc_mithermometer.cpp

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#include "atc_mithermometer.h"
#include "esphome/core/log.h"
 
#ifdef USE_ESP32
 
namespace esphome::atc_mithermometer {
 
static const char *const TAG = "atc_mithermometer";
 
void ATCMiThermometer::dump_config() {
  ESP_LOGCONFIG(TAG, "ATC MiThermometer");
  LOG_SENSOR("  ", "Temperature", this->temperature_);
  LOG_SENSOR("  ", "Humidity", this->humidity_);
  LOG_SENSOR("  ", "Battery Level", this->battery_level_);
  LOG_SENSOR("  ", "Battery Voltage", this->battery_voltage_);
}
 
bool ATCMiThermometer::parse_device(const esp32_ble_tracker::ESPBTDevice &device) {
  if (device.address_uint64() != this->address_) {
    ESP_LOGVV(TAG, "parse_device(): unknown MAC address.");
    return false;
  }
  char addr_buf[MAC_ADDRESS_PRETTY_BUFFER_SIZE];
  const char *addr_str = device.address_str_to(addr_buf);
  ESP_LOGVV(TAG, "parse_device(): MAC address %s found.", addr_str);
 
  bool success = false;
  for (auto &service_data : device.get_service_datas()) {
    auto res = parse_header_(service_data);
    if (!res.has_value()) {
      continue;
    }
    if (!(parse_message_(service_data.data, *res))) {
      continue;
    }
    if (!(report_results_(res, addr_str))) {
      continue;
    }
    if (res->temperature.has_value() && this->temperature_ != nullptr)
      this->temperature_->publish_state(*res->temperature);
    if (res->humidity.has_value() && this->humidity_ != nullptr)
      this->humidity_->publish_state(*res->humidity);
    if (res->battery_level.has_value() && this->battery_level_ != nullptr)
      this->battery_level_->publish_state(*res->battery_level);
    if (res->battery_voltage.has_value() && this->battery_voltage_ != nullptr)
      this->battery_voltage_->publish_state(*res->battery_voltage);
    success = true;
  }
  if (this->signal_strength_ != nullptr)
    this->signal_strength_->publish_state(device.get_rssi());
 
  return success;
}
 
optional<ParseResult> ATCMiThermometer::parse_header_(const esp32_ble_tracker::ServiceData &service_data) {
  ParseResult result;
  if (!service_data.uuid.contains(0x1A, 0x18)) {
    ESP_LOGVV(TAG, "parse_header(): no service data UUID magic bytes.");
    return {};
  }
 
  auto raw = service_data.data;
  if (raw.size() < 13) {
    ESP_LOGVV(TAG, "parse_header_(): service data too short (%zu).", raw.size());
    return {};
  }
 
  static uint8_t last_frame_count = 0;
  if (last_frame_count == raw[12]) {
    ESP_LOGVV(TAG, "parse_header(): duplicate data packet received (%hhu).", last_frame_count);
    return {};
  }
  last_frame_count = raw[12];
 
  return result;
}
 
bool ATCMiThermometer::parse_message_(const std::vector<uint8_t> &message, ParseResult &result) {
  // Byte 0-5 mac in correct order
  // Byte 6-7 Temperature in uint16
  // Byte 8 Humidity in percent
  // Byte 9 Battery in percent
  // Byte 10-11 Battery in mV uint16_t
  // Byte 12 frame packet counter
 
  const uint8_t *data = message.data();
  const int data_length = 13;
 
  if (message.size() != data_length) {
    ESP_LOGVV(TAG, "parse_message(): payload has wrong size (%d)!", message.size());
    return false;
  }
 
  // temperature, 2 bytes, 16-bit signed integer (LE), 0.1 °C
  const int16_t temperature = uint16_t(data[7]) | (uint16_t(data[6]) << 8);
  result.temperature = temperature / 10.0f;
 
  // humidity, 1 byte, 8-bit unsigned integer, 1.0 %
  result.humidity = data[8];
 
  // battery, 1 byte, 8-bit unsigned integer,  1.0 %
  result.battery_level = data[9];
 
  // battery, 2 bytes, 16-bit unsigned integer,  0.001 V
  const int16_t battery_voltage = uint16_t(data[11]) | (uint16_t(data[10]) << 8);
  result.battery_voltage = battery_voltage / 1.0e3f;
 
  return true;
}
 
bool ATCMiThermometer::report_results_(const optional<ParseResult> &result, const char *address) {
  if (!result.has_value()) {
    ESP_LOGVV(TAG, "report_results(): no results available.");
    return false;
  }
 
  ESP_LOGD(TAG, "Got ATC MiThermometer (%s):", address);
 
  if (result->temperature.has_value()) {
    ESP_LOGD(TAG, "  Temperature: %.1f °C", *result->temperature);
  }
  if (result->humidity.has_value()) {
    ESP_LOGD(TAG, "  Humidity: %.0f %%", *result->humidity);
  }
  if (result->battery_level.has_value()) {
    ESP_LOGD(TAG, "  Battery Level: %.0f %%", *result->battery_level);
  }
  if (result->battery_voltage.has_value()) {
    ESP_LOGD(TAG, "  Battery Voltage: %.3f V", *result->battery_voltage);
  }
 
  return true;
}
 
}  // namespace esphome::atc_mithermometer
 
#endif