Adapter for Zigbee2Mqtt

[fridrichovsky]

Hello,
please help me with adapter for Z2M. I am using ZBT-1, but I have last month problem that Z2M stuck and I have to restart add-on. I suppose that is time for coordinator change. I would like use the best one for Z2M. I found this SLZB-06, but I am confused with types because you suggest SLZB-06M. I found that SLZB-06M is better for ZHA and SLZB-06 for Z2M. Your web sites say SLZB-06M is recommended. I can't suggest which one to buy.

I found that SLZB-06 include chip CC2652P and SLZB-06M chip EF32MG21 so by the chip I should buy SLZB-06.

Please help me for the best discussion or if you have different coordinator for the best cooperation please send me which one.

Thank you.

[Koenkk]

I don't expect you will see any improvement when switching away from the ZBT-1 (as long as it is connected through a usb extension cable). All adapters you listed in the post are very comparable.

I have last month problem that Z2M stuck and I have to restart add-on.

Do you have any logging of this?

[fridrichovsky]

Hello,
thank you for your response. When I looked for best adapter I found that ezsp is deprecated. I used this. So I had to upgrade firmaware to last one and I switched to ember. I believe that it helps. So I will test it and if it stuck I send you log.

Again thank you for your time and quick answer.

[fridrichovsky]

Hello @Koenkk,
I changed the adapter to ember and it's help with my ZBT-1. I had problem with one device on the garden so I bought new coordinator with external antenna SLZB-MR1. So I believe that it helps with signal. I am using same settings "adapter: ember" and chip EFR32MG21. I see that new coordinator allow two chips. Second chip is CC2652P7. Do you recommend use CC2652P7 for better signal range or it doesn't matter?

Do you recommend use both chips when one will be coordinator and second as zigbee router or it is bad idea?

Last question is connected with my problematic device. When I switch of power for garden and switch on back every thing works some time perfectly, but after few minutes or hours I have problem with device. I get this error:

[14. 12. 2025 8:08:59] z2m: Publish 'set' 'state' to 'zahrada_domecek241B' failed: 'Error: ZCL command 0xa4c138cea6afa791/1 genOnOff.on({}, {"timeout":10000,"disableResponse":false,"disableRecovery":false,"disableDefaultResponse":false,"direction":0,"reservedBits":0,"writeUndiv":false}) failed (Delivery failed for '59405'.)'

I didn't find list of errors so I don't know what is wrong because 59405. Please help me with this error or where I can find list of these errors, because I get sometimes this Delivery failed for '21018'.?

I upgraded all my routers to newest versions and new coordinator is also on last versions:

Model: SLZB-MR1	Radio 1	Radio 2	Core
CPU model:	EFR32MG21	CC2652P7	ESP32
Firmware version:	20250220	20240727	v3.1.3
Latest FW check:	14/12/2025	14/12/2025	14/12/2025

Thank you for your help.

[Koenkk]

Do you recommend use CC2652P7 for better signal range or it doesn't matter?

This is hard to answer as it mainly depends on the antenna design of this device.

Do you recommend use both chips when one will be coordinator and second as zigbee router or it is bad idea?

Since they are a few cm from each other, I would turn only 1 chip on.

[14. 12. 2025 8:08:59] z2m: Publish 'set' 'state' to 'zahrada_domecek241B' failed: 'Error: ZCL command 0xa4c138cea6afa791/1 genOnOff.on({}, {"timeout":10000,"disableResponse":false,"disableRecovery":false,"disableDefaultResponse":false,"direction":0,"reservedBits":0,"writeUndiv":false}) failed (Delivery failed for '59405'.)'

This means the device is not reachable, try extending your network coverage here.

[fridrichovsky]

Thank you for your help. Last question the device show LQI around 100 so I thought that it is good network coverage. I see last seen periodically updated so I thought that there is no problem with network. I'll buy repeater by your suggestion, but I would like understand what LQI means or last seen.