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Zigbee Coordinator Failover

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I want to build a fault-tolerant network, and one of the concerns is the zigbee coordinator failover to a different device.

I am a smart home enthusiast and I have a some background in high availability servers, so I decided that my smart home must be fault tolerant.

I have a Home Assistant server and a number of zigbee devices on my network. Home Assistant server has an XBee and is a coordinator for the network. I want to have a server in a different location of my house that will be able to completely replace the primary coordinator in case of a disaster. All devices must remain in the same network, and request to 0000 address must be routed to the new coordinator.

I've read https://www.digi.com/resources/documentation/Digidocs/90002002/Content/Concepts/c_zb_replacing_coordinator.htm , but I am not ready to disable encryption. Is some solutions with encryption available?

If I configure both with the same key with KY, would that be enough?
asked Dec 12, 2019 in XBee3 ZigBee by Shulyaka New to the Community (3 points)

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1 Answer

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See https://www.digi.com/resources/documentation/digidocs/90002002/default.htm#Concepts/c_zb_replacing_coordinator.htm?Highlight=Coordinator%20replacement
answered Dec 12, 2019 by mvut Veteran of the Digi Community (15,515 points)
I believe it cannot be hijacked if the attacker needs to know the network key prior to the attack.
Does the standard explicitly say 'This is not allowed. period.', or it defines some features that prevents me to do it? If the former, it would be no harm if I just violate it. If the latter, I want to know exactly what those features are.
Yes, it does. The standard does not allow for the Trust center to be replaced.  It is the one item that can't be replaced without re-forming the network. In Digi's case, the trust center is the coordinator. So in an encrypted network where use you are using a trust center, you can't replace the coordinator without issuing a network reset.

I believe Digi will be releasing a new firmware version in the next quarter that may add this feature on the newer XBee 3 products.
Yes. If you are using the Digi XBee 3 Zigbee 3 module, you will be able to swap out or create a back-up coordinator once that new version is released. This functionality might not be added to previous (non XBee3) releases such as the Digi XBee S2C due to memory constraints on that hardware.
Was this ever released and is it available?  I'm also looking for a fault tolerant solution to ZB since I have so many devices in my home now.
The ability to replace a Coordinator without a Trust Center enabled is released.  But if you are using a Trust Center, no, it was not part of the Zigbee standard. To replace the Trust Center, you must re-form the network.