Sonoff ZigBee dongle plus 3.0 with Synology NAS - Error?

MY Sonoff ZigBee dongle plus 3.0 arrived. I’m trying to set it up. I’ve done this:

  • Plugged in to NAS
  • Connect USB to VM in DSM7

Do I need to flash it with firmware?

ID_MODEL_ID: ea60
ID_REVISION: '0100'
ID_SERIAL: Silicon_Labs_Sonoff_Zigbee_3.0_USB_Dongle_Plus_0001
ID_SERIAL_SHORT: '0001'
ID_TYPE: generic
ID_USB_DRIVER: cp210x
ID_VENDOR: Silicon_Labs
ID_VENDOR_ENC: Silicon\x20Labs
ID_VENDOR_ID: 10c4
MAJOR: '188'
MINOR: '0'

In HA,

  • Install Mosquitto broker addon
  • Zigbee2MQTT addon

I was trying to follow HOW TO - Sonoff Zigbee 3.0 Dongle Plus in Home Assistant (Flash, Update, Zigbeemqtt & MQTT Broker) - YouTube but the HA interface changed, I hope I got it right.

I made a user & added this section to Zigbee2MQTT

mqtt:
  base_topic: zigbee2mqtt
  user: mqtt
  password: mqtt
serial:
  port: /dev/ttyUSB0

So in the end I have Mosquitto broker

and Zigbee2MQTT

Now both addons restarted themselves. Now I have

[14:51:41] INFO: Handing over control to Zigbee2MQTT Core ...
Error: ENOENT: no such file or directory, open 'null/configuration.yaml'

Restarted a few more times and it went away.

In devices I have
image

with no options

and
image

Now go to sidebar zigbee2mqtt/dashboard
It shows empty. In the source I see it says “502: Bad Gateway”