By using this skill you would be able to control your home appliances using MQTT. Your device must have the capability to receive mqtt topic. This skill is for the beginners who want to test Alexa for controlling household devices. Topic for mqtt message is "taifur/test/pi/voice" and client is "mqtt://test.mosquitto.org". You can try MQTT.fx to test without any physical device. Just ask Alexa with the phrase "Alexa, ask my home turn on my bathroom light" or "Alexa, ask my home turn off my bedroom fan." You can also use any physical device like Raspberry Pi with paho-mqtt client. Details: https://www.instructables.com/id/Voice-Controlled-Smart-Home/