{
  "transport": "mqtt",
  "broker": "mqtt3.thingspeak.com",
  "port": 8883,
  "tls": true,
  "auth": {
    "clientId": "MQTT_DEVICE_CLIENT_ID",
    "username": "MQTT_DEVICE_USERNAME",
    "password": "MQTT_DEVICE_PASSWORD"
  },
  "publish": {
    "topic": "channels/12345/publish",
    "qos": 0,
    "payload": "field1=23.5&field2=45.2&status=ok"
  }
}