Questions, support please don't open an issue, go first to the docs and if you not find your answer go to the community forum
Download OpenMQTTGateway from the releases page
The reference sheet, with the list of all functions, pinouts is here
A list of supported devices is available here, door/window sensors, PIR sensors, smoke detectors, weather stations...
A list of compatible components to build your gateway is available here, nodemcu, esp32, emitters and receivers...