Add ability to receive current temperature from HVAC about gree-hvac-mqtt-bridge HOT 3 OPEN

const publishIfChanged = function (stateProp, newValue, mqttTopic) {
  if (newValue !== deviceState[stateProp]) {
    // I have no idea where else to subtract 40 so I just do it here
    if (mqttTopic == '/curtemperature/get') {
      deviceState[stateProp] = newValue - 40
    }
    else {
      deviceState[stateProp] = newValue
    }
    client.publish(mqttTopicPrefix + mqttTopic, newValue)
  }
}