To my (limited) knowledge, there must be just one coordinator in a Zigbee network. Right?
A week ago or so, my automations became sluggish or unresponsive, with a lag of a random number os seconds or even not responding at all.
Digging a bit, I found that devices didn’t report or changed state through the Z2M web UI nor publishing payloads to the MQTT broker.
I realized then that two coordinators are shown on the network map, one is the actual coordinator (big yellow dot) and the other one was a wall switch. I removed the switch from Z2M and now the lag problem looks to be fixed (or the lag is almost unnoticeable), but the map still shows two coordinators, i.e. the coordinator itself and a bulb.
I didn’t see that parent-children relationships in previous Z2M versions either.
Is there a malfunction/misconfiguration or is this normal and I need to review my Zigbee knowledge?
Most of the unconnected devices are battery powered and a few of them are indeed disconnected.
Configuration:
Zigbee2MQTT ver. 2.6.2-1
Home Assistant OS
Core ver. 2025.10.1
Supervisor 2025.10.0
Operating system 16.2
Running on an RPi 4 4GB. And the coordinator is CP2652P (Ebyte E72-2G4M20S1E), don’t remember the manufacturer/integrator and haven’t check the firmware versions, as these are proven to work during years.
Well, it didn’t mean to be another question. It was just additional info to the only question.
Re-reading it, you are right and it looks like two separate questions because I don’t think the memory leak has anything to do with the Z2M config issue.
Ok.
Well there appears to be 1 coordinator in that picture.
Why do you think there is 2? The coordinator is the yellow dot. Special software is loaded into the coordinator to coordinate, so if you didn’t do that, it didn’t just load itseld.
Most mains powered zigbee devices route, that is what you want to happen.
Most likely whatever disruption if there is one is due to not enough routers for the number of end devices that do not route.
You can study more about Zigbee Protocol in several posts in this list:
Read the link @Sir_Goodenough has kindly provided for you. Zigbee works as a mesh network.
What you’re seeing is:
Yellow dot: your 1 & only coordinator.
Blue dots: zigbee routers which should form the backbone of your mesh
Green dots: end devices, usually battery powered.
Look at the map you posted & pay careful attention to the circled yellow & blue dots. The red line between them means they might have trouble communicating (especially since they’re passing traffic from the green end devices too).
Thanks for your replies and the link. I’ll read it carefully. I already know about the topology, roles, etc in a Zigbee network, but I’m far to consider myself an expert.
What confused me is this one in addition to the actual coordinator:
