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        The channel parameter indicates the source of received UART characters

        and the sink for transmitted UART characters.

        The  can be either "file", "xterm", "tcp", "fd", or "tty"

        (without quotes).

          A) To send/receive characters from a pair of files, use a file

             channel:

               channel=file:,

          B) To create an interactive terminal window, use an xterm channel:

               channel=xterm:[]*

          C) To create a bidirectional tcp socket which one could, for example,

             access via telnet, use a tcp channel:

               channel=tcp:

          D) To cause the UART to read/write from existing numeric file

             descriptors, use an fd channel:

               channel=fd:,

          E) To connect the UART to a physical serial port, create a tty

             channel:

               channel=tty:device=/dev/ttyS0,baud=9600