...
1. After you've created and configured the gateway, connect it to ClearBlade IoT Core over the MQTT bridge.
2. Create devices if you haven't already.
3. Optional: Bind the devices to the gateway. When using the MQTT bridge, you only need to bind the devices if they can't generate their JWTs.
...
To be notified when a device encounters an error, subscribe the gateway to the MQTT /devices/{gateway_ID}/errors topic using QoS level 0.
These code samples illustrate how to subscribe the gateway to the MQTT/devices/{gateway_ID}/errors topic using QoS level 0:
...