nuttx-apps/examples/flowc

General Usage Instructions:

1. The receiver side enter, start the receiver program.   The receiver
   is now waiting to receive data on the configured serial port

2. On the sender side start the sender program.  This will send data to
   the receiver which will verify that no data is lost.

   On Linux, you can alternatively do:

     $ stty -F /dev/ttyACM0 crtscts
     $ cat testdata.dat >/dev/ttyACM0

   where you need to replace /dev/ttyACM0 with your selected serial
   device.