after a long time I have finally some time to play with BC. I have RPi 3B+ with dietpi, USB dongle in it and remote battery operated Climate module. I have made everything in the tutorial for custom setup. Node-RED is working, but when I hit “List of paired button”, “All gateway info” or “Pairing mode start” the gateway in debug window returns only empty string. I have tested the USB dongle in Windows machine and it successfully pairs with the Climate module.
Thank you for your suggestion, but it is working now. It was a loose and dirty (this RPi is a little bit abused one )USB connector with bad contact. Everything is now working great.