/**
  \example brn.cpp 

  The reflex 'baud rate negotiation' protocol always starts out at
  9600 8N1, and involves ongoing exchanges of type 'S' (originally
  referring to 'Speed') packets, the first of which is always 'S!'.
  An 'SC' ('Speed Complete') packet ends the initial protocol.

  If a sketch wants to do conscious packet handling on a face, and is
  happy to run the face at 9600 8N1, it is possible to 'short circuit'
  the BRN, saying in effect "Let's just keep talking 9600 8N1."  This
  sketch demonstrates a way to do that.

 */
