I don't know. I think when you read them off of ttyDB0 they're gone. If you don't send an ACK, however, they should get sent again. If someone else is reading the device as well, then maybe that agent will read half the messages and things will eventually be processed. But then if that daemon is reading half the messages, it might swallow up the key presses AND ack them so that I never receive half the input.
I don't know, it's all theoretics at this point and i have to try all of this in hardware.
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