In addition to the visualisation and analysis of measurement data, Thingsboard also enables the control of devices via the so-called Remote Procedure Calls. This allows functions to be executed on other devices connected to the internet using the MQTT protocol and the results to be sent back to Thingsboard. To test the functionality, simple circuits were built with an ESP32 microcontroller and a LED. The LED can be switched on and off via Thingsboard and can also be dimmed when using the digital-to-analogue converter integrated in the EPS32.
