Is my CC2531 broken?

Hi!
I have CC2531 USB stick what is flashed with CC2531_DEFAULT_20190608.zip

Stick is connected to Raspberry Pi 4 where hass.io ver: 192 is running.

I have: # Zigbee2mqtt Hass.io Add-on 1.6.0

Config:
{
  "data_path": "/share/zigbee2mqtt",
  "devices": "devices.yaml",
  "groups": "groups.yaml",
  "homeassistant": true,
  "permit_join": true,
  "mqtt": {
    "base_topic": "zigbee2mqtt",
    "server": "mqtt://a0d7b954-mqtt",
    "user": "mqtt",
    "password": "mqtt"
  },
  "serial": {
    "port": "/dev/ttyACM0"
  },
  "advanced": {
    "pan_id": 6754,
    "channel": 11,
    "network_key": [
      1,
      3,
      5,
      7,
      9,
      11,
      13,
      15,
      0,
      2,
      4,
      6,
      8,
      10,
      12,
      13
    ],
    "availability_blacklist": []
  },
  "ban": [],
  "whitelist": [],
  "queue": {},
  "socat": {
    "enabled": false,
    "master": "pty,raw,echo=0,link=/dev/ttyZ2M,mode=777",
    "slave": "tcp-listen:8485,keepalive,nodelay,reuseaddr,keepidle=1,keepintvl=1,keepcnt=5",
    "restartdelay": 1,
    "initialdelay": 1,
    "options": "-d -d",
    "log": false
  }
}

Log file says:

./run.sh: line 16: [Info] Configuration backup found in /share/zigbee2mqtt/.configuration.yaml.bk. Skipping config backup.: No such file or directory
[Info] Socat is DISABLED and not started
2019-11-10T12:37:38: PM2 log: Launching in no daemon mode
2019-11-10T12:37:38: PM2 log: App [npm:0] starting in -fork mode-
2019-11-10T12:37:38: PM2 log: App [npm:0] online
> [email protected] start /zigbee2mqtt-1.6.0
> node index.js
  zigbee2mqtt:info 11/10/2019, 12:37:41 PM Logging to directory: '/share/zigbee2mqtt/log/2019-11-10.12-37-41'
  zigbee2mqtt:info 11/10/2019, 12:37:42 PM Starting zigbee2mqtt version 1.6.0 (commit #unknown)
  zigbee2mqtt:info 11/10/2019, 12:37:42 PM Starting zigbee-shepherd
  zigbee2mqtt:info 11/10/2019, 12:37:43 PM zigbee-shepherd started
  zigbee2mqtt:info 11/10/2019, 12:37:43 PM Coordinator firmware version: '20190608'
  zigbee2mqtt:info 11/10/2019, 12:37:43 PM Currently 0 devices are joined:
  zigbee2mqtt:warn 11/10/2019, 12:37:43 PM `permit_join` set to  `true` in configuration.yaml.
  zigbee2mqtt:warn 11/10/2019, 12:37:43 PM Allowing new devices to join.
  zigbee2mqtt:warn 11/10/2019, 12:37:43 PM Set `permit_join` to `false` once you joined all devices.
  zigbee2mqtt:info 11/10/2019, 12:37:43 PM Zigbee: allowing new devices to join.
  zigbee2mqtt:info 11/10/2019, 12:37:43 PM Connecting to MQTT server at mqtt://a0d7b954-mqtt
  zigbee2mqtt:info 11/10/2019, 12:37:43 PM zigbee-shepherd ready
  zigbee2mqtt:info 11/10/2019, 12:37:43 PM Connected to MQTT server
  zigbee2mqtt:info 11/10/2019, 12:37:43 PM MQTT publish: topic 'zigbee2mqtt/bridge/state', payload 'online'
  zigbee2mqtt:info 11/10/2019, 12:37:43 PM MQTT publish: topic 'zigbee2mqtt/bridge/config', payload '{"version":"1.6.0","commit":"unknown","coordinator":20190608,"log_level":"info","permit_join":true}'
  zigbee2mqtt:info 11/10/2019, 12:40:23 PM Successfully reenabled joining
  zigbee2mqtt:info 11/10/2019, 12:43:03 PM Successfully reenabled joining

Green led on the stick is constantly burning.

I have tried to join multiple different devices, but I cannot get any other lines to log file… No errors and no any pairing lines like:

Successfully interviewed ‘0x00158d0001dc126a’, device has successfully been paired

I have also tried to use https://github.com/Frans-Willem/AqaraHub and no success.

So… is my USB stick faulty? (from aliexpress)
Can I some way to do “debug” of the stick?

Your stick looks OK, if the led is burning green. Did you connect the cc2531 in an USB port of the RbPi, or did you use an extension cable ? If connected direct to the RbPi, interference from the RbPi could be the problem.

YES!
Thank you!

That was that, when I moved USB stick one meter away from RbPi, everything start working.

Thank you!