All of my Zigbee devices went offline yesterday while I was out of the house. I have attempted rebooting the hub and resetting power to the devices to no avail.
It seems like Zigbee devices with next hop to Hub are capable of transmitting state info TO the hub (such as wattage), however the hub is unable to successfully send messages to the Zigbee devices (unable to turn devices on/off or dim from the app ).
After reading this post, i discovered the root cause of the problem. Last night I plugged in a USB 3.0 hard drive to my cluster of raspberry pis close to my hub. This apparently is causing interference with Zigbee 2.4ghz signal. When I unplugged the USB hard drive from the rasbpi, the issue immediately resolved. How strange and odd, however happy I discovered the culprit.
My cluster of Raspberry Pis (stack, collection, family) went in around Feb 15 and boom, zibee failed that evening for the whole house. Lesson learned. Hub moving later tonight 20ft away.
I have a ZigBee extender/repeater that had been working fine for 6-7 months. At one point last December, something changed and all ZigBee devices connected to that particular repeater would keep going unavailable and the repeater would sort of hang/just stop updating it’s status even though there was power. While I was researching the issue, at some point I changed the usb power adapter and the issue resolved itself. I had figured the power adapter must have been the cause, even though I know that power adapter is still working for charging other usb devices. Since everything was working I didn’t dwell on it any more.
This morning while reading this thread I remembered that I had bought a few USB3 90 degree male to female adapters and used one of them for the repeater. When I changed the power adapter I did not use it any more. Now I am wondering if it had to do with the fact it was USB3 and not USB2, the male to female adapter still works.
As a follow up, since my network rack is tightly colocated together, I contemplated moving my Smarthings hub to another floor. However I was able to utilize nearby USB 3.0 devices nearby the ST hub by moving the hub so that a medium sized metal server housing was between the offending USB and ST. Not pretty, but thankfully 2.4ghz signal (i.e. interference) does not propagate well thru solid objects.