My smart home infrastructure contains several Xiaomi humidity/temperature and door sensors. I’ve used these sensors with the corresponding Xiaomi gateway. The gateway was connected with my BananaPi M2U and Pimatic. But my home is long and tall. One gateway does not cover all rooms, and therefore far sensors disappear periodically.
I’ve googled and found I can use Xiaomi sockets (Zigbee edition) like Zigbee routers. This socket is less expensive than a new gateway, and it has a smaller size. I’ve purchased tow sockets and used them for about a month. This socket has a big problem (from my point of view). It can go into the deep sleep mode and cannot forward data packets from sensors.