Mission Planner Connection Options

Mission Planner version 1.3.81 and ArduCopter 4.4.4. Can someone graciously describe the three connections shown under COM4? What does each connection do?

There are three devices, with two sysid and the sysid 42 has two components.
See details on mavlink routing. MAVLink Routing in ArduPilot — Dev documentation

Btw, this looks like a wrong mavlink configuration. The camera and onboard components supposed to have the same sysid as their host flight system.

i happen to know this is a herelink.
sysid 42 is the herelink units themself.
the camera exposes the camera api info
and the system control exposes system information

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