[OBSOLETE] Original & Aqara Xiaomi Zigbee Sensors (contact, temp, motion, button, outlet, leak, etc)

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Well, Aqara / Xiaomi devices never rejoin when requested to leave and rejoin by a hub or repeater device, and the only identified circumstance leading to that is when Aqara / Xiaomi devices try to check in after a check-in timeout has passed by, as explained here.

There are very likely other cases where a hub or repeater would request an end device to leave and rejoin, but a short interruption in the ZigBee mesh network due to a hub rebooting, etc., is not one of them, based on my experience and everything I’ve read of other user’s experiences.

If you don’t have any ZigBee repeater devices, and have attempted to avoid 2.4GHz WiFi interference, then I have a couple of guesses about the reason for the connectivity issues with your Aqara Door/Window Sensors:

  1. The signal strength between your hub and the Aqara Door/Window Sensors may be relatively weak (weaker than that of the Aqara Temp/Humidity sensors) and some change in the environment has led to the signal being too weak to maintain a consistent connection. The best solution in this case would be to add a repeater device (like the IKEA outlet you’re getting) in a location between the sensors and the hub, and then either re-pair / manually re-join the door/window sensors so that they (hopefully) choose to connect through the repeater. Only a ZigBee sniffer or preferably an XBee module would allow confirmation of the routing of those sensor, though.

  2. The ZigBee network 32-end-device limit of the hub may have been reached. The solution here is also to add one or more repeater devices, which don’t count against that 32-end-device limit, but do allow additional end-devices to be paired to the Zigbee network.

I should note that among my over 40 ZigBee devices (over 30 of which are Xiaomi/Aqara), I have 6 each of the Aqara and Xiaomi door/window sensors along with a couple of XBee modules (which serve as repeaters in addition to allow a view of the network’s routing map) and one IKEA outlet, and I have only seen two of the Aqara Door/Window sensors drop off the network a couple of times in the past year-and-a-half. But that was most likely due to all the testing I’ve done with a few repeater devices (which turned out not to be compatible with Aqara / Xiaomi devices).

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