https://github.com/jamesrutter/makerQTT
Below is a proof of concept to test an ESP32-C3 device sending a MQTT message to the HiveMQ broker and then having a second device (RaspberryPi) receive the message. This establishes a baseline template for creating devices on the Maker Exchange Network.
ESP32C3 (left) sending MQTT message when button pressed. Raspberry Pi (right) receiving MQTT message.
ESP32-C3 circuit with LED blinking when MQTT message received from Raspberry Pi MQTT Client.