Add support for the required IOTA_MQTT_* environment variables
Add support for the required IOTA_MQTT_* environment variables

telefonicaid/iotagent-json,telefonicaid/iotagent-mqtt,telefonicaid/iotagent-mqtt,telefonicaid/iotagent-mqtt,telefonicaid/iotagent-json,telefonicaid/iotagent-json