To know the main functions of the gateway see below https://1technophile.github.io/OpenMQTTGateway/
Download OpenMQTTGateway from the releases page
The reference sheet, with the list of all functions, pinouts is here
A list of supported 433mhz devices (and others) 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...
If you want to buy a coffee or other beverage so as to give me some support, here is a way to do it :