Poor connection between Sonoff CC2652P and Develco SPLZB-131

[mwhrtin]

What happened?

Perhaps this is a hardware issue with the Sonoff USB dongle, but I'll report it anyway.

After migrating from deCONZ and ConBee 1 to Zigbee2MQTT and Sonoff CC2652P, two Develco SPLZB-131 smart plugs are repeatedly dropping off the network and are marked as offline. The smart plugs go offline 3-4 times a day, they reconnect after a couple of hours but continue to go offline.

The network should be well meshed with 45 mains powered routers, the two smarts plugs should have at least an "okay" connection and there are other router devices located in the same room next to the smart plugs that are not experiencing any issues.

The coordinator is connected with an USB extension cable to reduce/prevent interference and the Zigbee channel is set to 25 which is furthest away from any nearby WiFi channel. I've tried changing the transmit power from anywhere between 1dbm up to 20dmb but this didn't affect anything and the smart plugs still go offline.

The reported LQI fluctuate between 80-100 for both devices, other devices in the same location report similar LQI values but without dropping off the network. I tried to unscrew the antenna from the Sonoff USB dongle, all devices reported 0 LQI but the connection against the smart plugs actually appeared to be more stable, but instead 90% of the network would go offline sporadically so this wasn't a viable solution.

Right now to overcome this issue I'm running two instances of Zigbee2MQTT in parallell from the same machine. One with Sonoff CC2652P acting as my main network, and then one with ConBee 1 that only connects to the two Develco SPLZB-131 smart plugs. Since I reverted back to ConBee for the smart plugs they've been online non-stop for days with an LQI of 255. This despite the ConBee sharing its Zigbee channel with one of my WiFi access points and the coordinators being just a few inches apart.

The Sonoff CC2652P is running the latest zStack3x0 firmware, the ConBee stick is using the latest stock firmware.

What did you expect to happen?

The connection between Sonoff CC2652P and Develco SPLZB-131 is stable.

How to reproduce it (minimal and precise)

Connect Develco SPLZB-131 to Sonoff CC2652P running the zStack3x0 firmware. Observe the unstable connection. Reconnect the Develco SPLZB-131 to Conbee running stock firmware, everything else the same, observe a stable connection.

Zigbee2MQTT version

1.33.2 commit: 9996c93

Adapter firmware version

20230507

Adapter

Sonoff ZigBee 3.0, USB Dongle Plus, TI CC2652P

Debug log

No response

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