Z2M 2.0.0: USB adapter discovery error (No valid USB adapter found)

[Koenkk]

TL;DR

Add adapter (likely zstack, see docs for more info) to your Zigbee2MQTT configuration.yaml, example:

serial:
  port: /dev/ttyACM0
  adapter: zstack # <-- Add this line

What changed?

Koenkk/zigbee-herdsman#1197 brings improvements to the adapter discovery feature. This feature allows Zigbee2MQTT to automatically detect your adapter (preventing the need for a serial section in configuration.yaml).

In case Zigbee2MQTT could not automatically detect the type of adapter, it would default to zstack. This gives issues to people using other adapters. When not specifying the adapter and when using e.g. an EZSP adapter, Zigbee2MQTT will fail to start with Error: SRSP - SYS - ping after 6000ms instead of a clear error message. This behaviour has now been changed. Starting from 1.41.0, in case Zigbee2MQTT cannot automatically detect your adapter, you have to explicitly specify the serial port and adapter.

This change in behaviour has 1 drawback. In case Zigbee2MQTT defaulted to zstack before in your setup, it will now fail to start with USB adapter discovery error (No valid USB adapter found). Specify valid 'adapter' and 'port' in your configuration.. This can be fixed by adding adapter: zstack to your Zigbee2MQTT configuration.yaml as described above.

The full documentation can be found here.