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- fix initialization routine to auto-select appropriate port between either hardware-only serial or hardware-plus-software serial both depend on which TX and RX pins are selected - allow to use 'swapped' uart0 mode with pinx 13 and 15 - software serial is no longer forced upon the user, setup depends on which tx and rx are used in config - allow to either send or receive data as HEX strings mqtt received `616263` gets written as `abc` and vice versa - (optional) send termination byte when writing to serial