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I have been struggling to connect my Xiaomi Gateway to Homey. And failed…
Om the Home Assistant forum I found the reason (my gateway’s MAC is mentioned…)

Source: https://www.home-assistant.io/integrations/xiaomi_aqara

If your gateway’s MAC address starts with 04:CF:8C or 7C:49:EB , there is a good chance that the required port 9898 is closed on your gateway (you can check it with the Nmap utility, using the command sudo nmap -sU {gateway_ip} -p 9898 ). To fix that issue, you need to do these steps:

  • Find a specific screw bit (like a fork) to open the gateway case.
  • Find a USB-UART cable/module and connect it to your computer.
  • Solder 3 wires - RX, TX and GND like here.
  • Turn on the gateway (220V).
  • Open a serial terminal application (e.g., PuTTY) and connect to the serial port assigned to the USB-UART module (baudrate: 115200).
  • Wait until the gateway is booted up, connect the RX, TX and GND wires to the UART module (don’t connect the Vcc (power) wire!).
  • You will see all the messages from the gateway.
  • Send the command psm-set network open_pf 3 (the command has to end with a CR newline character).
  • Check your settings executing the command psm-get network open_pf to be sure it’s OK.
  • Restart the gateway.
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