Is there a list of Things Gateway serial port commands?

I can hook up to the serial port on The Things Gateway and monitor activity. If I hit enter I get a command prompt:

I tried ? but I get:

?
*** Command Processor: unknown command. ***

So there is something processing commands! Is there a list of what can be done via the serial port? I would like something akin the to the Pycom lora.stats() command.

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