How does QGC detect a vehicle?

Hi all,

How does QGC detect a vehicle? Is it strictly based on MAVLink messages? I can transmit a heartbeat from my vehicle, and it shows up in the MAVLink console. Are there other messages to send that indicate to QGC that a vehicle is connected? I’m using SiK Radio modules, connected from my windows computer with a PIC32.

Best,
Pavlo