how does the switch know it is docked?

Plazorn

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How does the switch know it is docked? Is it a chip inside the dock? Does it have to do with the TV output module inside the Switch? Does the dock possibly even inject a payload to let the Switch know what is happening?
 
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could you possibly inject payloads through the dock?
No, since USB from dock works only in OTG mode. And no OTG device can push payload to Switch.
what does the chip in the dock do to let the switch know it is docked?
I don't know at technical level what's doing. Only that communication occurs to verify if Switch should switch to dock.
 
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