From the TTN Stack documentation, I note that the application server exposes a MQTT server to work with streaming events. Is it possible to subscribe and publish my own MQTT topics to the provided MQTT server by TTN Stack?
If not, what could be the alternative of doing this, if I want to receive the data coming from the gateway without subscribing to the existing topics that TTN Stack provides e.g. v3/{application id}/devices/{device id}/up ?