1. 2023. Amazon Alexa. https://developer.amazon.com/. 2023. Amazon Alexa. https://developer.amazon.com/.
2. 2023. Constrained Application Protocol. https://en.wikipedia.org/wiki/Constrained_Application_Protocol. 2023. Constrained Application Protocol. https://en.wikipedia.org/wiki/Constrained_Application_Protocol.
3. 2023. Eclipse Mosquitto - An open source MQTT broker.https://mosquitto.org/. 2023. Eclipse Mosquitto - An open source MQTT broker.https://mosquitto.org/.
4. 2023. GoControl HUSBZB-1 USB Stick.https://www.gocontrol.com/detail.php?productId=6. 2023. GoControl HUSBZB-1 USB Stick.https://www.gocontrol.com/detail.php?productId=6.
5. 2023. Google Cloud Free Program. https://cloud.google.com/free/docs/gcp-free-tier/#compute. 2023. Google Cloud Free Program. https://cloud.google.com/free/docs/gcp-free-tier/#compute.