Z2M PAN ID conflict | Home Assistant | Page 1

hollow gale Mar 17, 2023, 6:15 PM

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Here, let's move this discussion into a thread

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@hoary salmon Z2M has problems re-forming an existing network when the PAN ID is being broadcast by routers

hoary salmon Mar 17, 2023, 6:19 PM

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sure

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move to here

hollow gale Mar 17, 2023, 6:19 PM

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zigpy-cli can restore your old network settings, which should allow Z2M to start up normally

hoary salmon Mar 17, 2023, 6:19 PM

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so same pan id would have magically worked due to different channel right?

hollow gale Mar 17, 2023, 6:20 PM

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PAN ID has to stay the same, as otherwise it's a "new" network

hoary salmon Mar 17, 2023, 6:20 PM

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yeah - so i read...

hollow gale Mar 17, 2023, 6:20 PM

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Just run the restore /path/to/coordinator-backup.json zigpy command and it should work

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Then Z2M should start up fine

hoary salmon Mar 17, 2023, 6:21 PM

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restoring

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i have a habit of tarring up y zigbee2mqtt dir every now and again just in case

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hmm no restore cmd

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zigpy restore zigbee2mqtt/coordinator_backup.json

hollow gale Mar 17, 2023, 6:22 PM

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Same format as your energy scan command

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zigpy -vv radio znp /dev/serial/by-id/... restore zigbee2mqtt/coordinator_backup.json

hoary salmon Mar 17, 2023, 6:23 PM

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aaaahradio znp ...

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it's thinking about it

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maybe i should have -vv'd

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done. no errors.

hollow gale Mar 17, 2023, 6:24 PM

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Z2M now should start up without complaining

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Also, restoring old backups isn't a great idea: the network frame counter will roll back, causing some devices to refuse to respond to coordinator requests until they're power cycled or the transmit counter rolls forward to exceed its previous value

hoary salmon Mar 17, 2023, 6:26 PM

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hmmm bugger.

hollow gale Mar 17, 2023, 6:26 PM

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Though I think Z2M is smart enough not to do that if the network doesn't change

hoary salmon Mar 17, 2023, 6:28 PM

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hmm might move coordinator back to its spot too -i moved it wondering if relocation might improve signal

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but it was sitting next to my other coordintor (yes - the zb sticks were a good 30-50cm apart)

hollow gale Mar 17, 2023, 6:29 PM

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So does Z2M start back up now? Or is it still complaining about the PAN ID?

hoary salmon Mar 17, 2023, 6:31 PM

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it does

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but nigh on everythng is offline

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i think maybe trying to re-pair the routers i have (they are the little ikea ones that come with a usb power brick - but my power socket all happen to have usb-a on them so they actually conveniently plug right into all my power sockets directly so are small little nubs)

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and now i moved it (powered off and on - well pulled out plug) its timing out on start

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oh wait starte dnow

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needs to try start a bunch of times

hollow gale Mar 17, 2023, 6:39 PM

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So if it boots up, then it's happy with your network settings and at least they're correct

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Now you can do the channel change command and edit the Z2M config file and backup file

hoary salmon Mar 17, 2023, 6:42 PM

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yeah - its come back up

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but most stuff is offline 😦

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or well not responding

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warn 2023-03-17 18:42:22: Failed to ping '0_kitchen_back_8' (attempt 1/1, Read 0x9035eafffe2a9f3c/1 genBasic(["zclVersion"], {"sendWhen":"immediate","timeout":10000,"disableResponse":false,"disableRecovery":true,"disableDefaultResponse":true,"direction":0,"srcEndpoint":null,"reservedBits":0,"manufacturerCode":null,"transactionSequenceNumber":null,"writeUndiv":false}) failed (SRSP - AF - dataRequest after 6000ms))

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that kind of thing - all over the place

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would the channel change work even if stuff is off line and not responding?

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i assume the channel chnage is a network boradcast telling everyone to move?

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err broadcast

hollow gale Mar 17, 2023, 6:46 PM

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It is a broadcast

hoary salmon Mar 17, 2023, 6:46 PM

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so it might be even unresponsive devices get it?

hollow gale Mar 17, 2023, 6:46 PM

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It's possible, the broadcast is relayed by every device that hears it so hopefully some of them got it

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But it's very possible that some didn't

hoary salmon Mar 17, 2023, 6:49 PM

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well i'll find out

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it may cut the work

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that assumes i can get it back up and stable at all to then change channel...

hollow gale Mar 17, 2023, 6:50 PM

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I suspect that it's going to be a chicken and egg problem: your network is unstable and devices won't receive the broadcast to change channels because the channel is congested

hoary salmon Mar 17, 2023, 6:52 PM

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hmmm

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going to just accept i will have to re-pair things and that means screwdrivers and poking around electrical connections yet again

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i'm getting good at it 🙂

hollow gale Mar 17, 2023, 6:55 PM

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But at the same time, the channel change broadcast won't hurt: even if it doesn't work at all, you'll just have to rejoin devices, as you originally planned

hoary salmon Mar 17, 2023, 6:57 PM

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i probably shoudl change pan id anyway

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so maybe just start again it seems

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z2m shuts down after 2 or 3 mins due to all the timeuts it gets trying to get data from devices

hollow gale Mar 17, 2023, 6:58 PM

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The PAN ID conflict is just a Z2M bug, you don't need to change the PAN ID

hoary salmon Mar 17, 2023, 6:59 PM

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hmmm well getting it back up at all is a challenge....

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zigpy.exceptions.FormationFailure: Network formation refused: there is too much RF interference. Make sure your coordinator is on a USB 2.0 extension cable and away from any sources of interference, like USB 3.0 ports, SSDs, 2.4GHz routers, motherboards, etc.

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chicken and egg... yay

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so my 4000ms timeouts at start are probably the interference?

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lets try turn my own 2.4ghz wifi off and see

#Z2M PAN ID conflict