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Sending messages via MQTT

Our device is now ready to receive messages via MQTT. The MQTT server we are using features an MQTT, as well as an HTTP-interface. There are many different ways that we can now send messages to our device:

Via Terminal/PowerShell as MQTT messages using an MQTT client such as Mosquitto
Via Terminal/PowerShell as HTTP messages using curl
Via a third-party iOS/Android app
Via a third-party macOS/Windows/Linux app
Via a third-party web-based client (for example, http://www.hivemq.com/demos/websocket-client/)
Via a custom-made website using a JavaScript-MQTT client
Via a custom Android/iOS/macOS/Linux/Windows app using MQTT-client

Basically everything is possible depending on how you send text to your device. MQTT is ...

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