Adding zigbee downlight device with Zigbee2Mqtt

Hello everybody!

I am currently renovating my newly bought house.
Now I have a raspberry pi 4 with a zigbee stick.
I have installed Zigbee2mqtt Hass.io Add-on and added the following to the configuration:
“zigbee_shepherd_devices”: true

Then I put the following in the configuration of the file devices.js :

{
    zigbeeModel: ['NUET56-DL27LX1.1'], 
    model: 'LXZB-12A', 
    vendor: 'Zemismart', 
    description: 'RGB LED Downlight', 
    supports: 'RGB, Dimming',
    extend: gledopto.light_onoff_brightness_colortemp_colorxy
},

After this I tried to connect the lamp with home assistant but unfortunately it says the following:
`zigbee2mqtt:warn 9/18/2019, 9:20:46 PM Message without device!

I flashed the stick again and then tried to connect the lamp and I get the following message:
`zigbee2mqtt:warn 9/18/2019, 9:30:33 PM Message without device!

After this I emptied the database.db and flashed the stick again and then I get no message during the first connection.
After this I pressed the connect button again and I get the following message:

  zigbee2mqtt:info 9/18/2019, 9:36:10 PM Device incoming...
  zigbee2mqtt:info 9/18/2019, 9:36:10 PM MQTT publish: topic 'zigbee2mqtt/bridge/log', payload '{"type":"pairing","message":"device incoming"}'
  zigbee2mqtt:info 9/18/2019, 9:36:55 PM Device incoming...
  zigbee2mqtt:info 9/18/2019, 9:36:55 PM MQTT publish: topic 'zigbee2mqtt/bridge/log', payload '{"type":"pairing","message":"device incoming"}'

That’s all.

I don’t know what else I could do. I also tried to set zigbee shepherd to false, but then it says it’s an unknown device.
Has anyone had experience with this or the same experience that could help me with this?

Some extra info,
I have read that you also have to empty the devices.yaml file.
I did this. In addition, I also emptied the database. After this I restarted zigbee2MQTT and tried to connect the lamp again. Hereby I get the following log:

'{"version":"1.6.0","commit":"unknown","coordinator":20190608,"log_level":"info","permit_join":true}'
  zigbee2mqtt:info 9/19/2019, 9:45:49 PM New device 'NUET56-DL27LX1.1' with address 0x00124b001c85f438 connected!
  zigbee2mqtt:info 9/19/2019, 9:45:49 PM MQTT publish: topic 'zigbee2mqtt/bridge/log', payload '{"type":"device_connected","message":"0x00124b001c85f438","meta":{"modelID":"NUET56-DL27LX1.1"}}'
  zigbee2mqtt:info 9/19/2019, 9:46:20 PM Device incoming...
  zigbee2mqtt:info 9/19/2019, 9:46:20 PM MQTT publish: topic 'zigbee2mqtt/bridge/log', payload '{"type":"pairing","message":"device incoming"}'
  zigbee2mqtt:info 9/19/2019, 9:47:34 PM Successfully reenabled joining
  zigbee2mqtt:info 9/19/2019, 9:50:14 PM Successfully reenabled joining

But I don’t get any data and it doesn’t come into the MQTT discovery like the other sensors and actuators do