SONOFF “ZBDongle-E” (EFR32MG21 variant) fails to connect with Zigbee2MQTT

[azure eagle]

Hey there!
Following the recommendation I got the ITead SONOFF Zigbee 3.0 USB Dongle Plus Model “ZBDongle-E” (EFR32MG21 variant) and plugged that into my Homeassistant VM (running on Unraid).

It got detected and ZHA recognized it, but I wanted to directly go into the "broader" Zigbee2MQTT universe (again trusting some YT recommendations). So I disabled the ZHA and followed instructions to set up Zigbee2MQTT:

• Install the Mosquito Brooker
• Add repo and install ZIgbee2MQTT
• Adjust config

And I am greeted with the Error: Failed to connect to the adapter (Error: SRSP - SYS - ping after 6000ms) when trying to start the zigbee-herdsman.

The error hints to this site:
https://www.zigbee2mqtt.io/guide/installation/20_zigbee2mqtt-fails-to-start.html

I went throught the list of the first heading (Error: SRSP - SYS - ping after 6000ms)

1. the port is correct, it works both via /dev/ttyACM0? and /dev/serial/by-id/[...], the error changes when I change the config to a wrong port. Also the test further below (test -w /dev/ttyACM0 && echo success || echo failure) returns a success...
2. Not using one of those CC-Chipsets
3. Following this site I adjusted the HA configuration with the entry serial: adapter: ezsp (Validated the config from dev tools site, and rebotted HA)
4. Had the ZHA disabled before I started installing Zigbee2MQTT
5. Your hardware adapter is flashed with the router firmware and not with the coordinator firmware.
   -> No Idea.

I detached the USB from the VM and installed the Zigbee2MQTT directly on a docker (Unraid) and ended up with the same result.

I don't know how to confirm that my stick is on coordinator firmware.
If the device ID give a hint about the firmware, then I maybe have a rather new one _V2_20221201191527 from december 2022 ?

About firmware: Myself I ended up Here where it recommends 6.10.3.0 from 2022-06-30

I found a YT video about the E version, which links here

Both seem to recommend the same firmware version. But before I get to flashing (probably on my Desktop?) I wanted to ask for recommendations and guidance 🙂

My next step would be to go back to ZHA and see whether the stick is working as intended there

OMFG

I added

serial:
  adapter: ezsp

to HA's configuration.yml, not into the configuration of Zigbee2MQTT -.-

Now it works (at least no error)