Better RTS support
Reducing log output (lowering log level of line 437 from LOG_INFO to LOG_DEBUG) highlighted an issue with Telix stopping RX. That was fixed by checking RTS in input_thread(). Qmodem needs RTS checked when writing the MCR. This improved RTS support has been tested with Telix, Qmodem, Telemate, and Banacom at full data rates.
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