There is software, called RFLink that enables communication with a limited set of hardware. See https://www.domoticz.com/wiki/RFLink_Gateway_USB and https://www.domoticz.com/wiki/RFLink. There is allready a link to nodo shop there, you will receive a set. When you download the RFLink firmware (at least for the version R48), you will find the RFLinkLoader.exe that allows you to upload the RFLink.cpp.hex file to the adruino device without any other tool like the Arduino IDE. To test your device: keep the arduino attached via USB to the computer. There is an option; 'Serial Port logging'. Toggle it, you will see output in the application. Eg: The last lines indicate that the device is receiving commands.
Attach to domoticz and add the "RFLink Gatewat USB" device. Also; you may need to restart domoticz/the raspberry before the USB device is added to the 'Serial port' list. My suggestion is to add the device based on serial, (/dev/serial/by-id/usb-Arduino...) as when you change the port the /dev/tty... can change.
If device adding is enabled (System settings of domoticz, 'Accept new hardware/sensors', the devices should appear in the devicelist. Unfortunately, my ACDB-7000AC KaKu doorbel is not recognized. I tried the Rfxtrx433, sonoff RF Bridge (with standard portisch firmware) and this RFLink software, with no luck.
No question, just my information dumped so others can learn. That is why we are here...
