Send all data to external MQTT Server

You only need to change the server= line in the [integration.mqtt] section of your chirpstack.toml

Changing the Chirpstack gateway bridge’s address means that it will no longer forward gateway events to Chirpstack. Besides the MQTT events coming out of the gateway-bridge are still encrypted and no use to external applications. The flow for an uplink looks like.

End device to Gateway using LoRa → Gateway sends to gateway bridge using UDP or Basicstation → Gateway Bridge sends encrypted packet to MQTT broker using MQTT → MQTT broker forwards encrypted packet to Chirpstack → Chirpstack decrypts the packet and re-posts it to the Broker in the [integration.mqtt] section