Mqtt keep alive

I have installed mosquitto broker on the X3000 and can access the router with an mqtt client. I want to be able to pull data from the router into my home assistant but I don’t know what to use as the subscribe topic for keepalive so I can browse the data available. Can someone help me out?

This may help: BLE MQTT Bridge - GL.iNet Router Docs 3

You can Gogole the developers documentation.