/**
  \example log.cpp 

  Here's a tiny sketch demonstrating conscious packet handling.  It
  opens the south face in 'conscious mode', at 9600 8N1, but leaves
  the others (including north) to default to reflex mode.  Then it
  polls for southern packets, and whenever it finds one, it embeds it
  in a northbound 'L'og packet.

  (This sketch also demonstrates #facePrintf, using the SFB-specific
  (and confusing-looking) '\%\#p' format code.  In facePrintf, '\%p'
  takes a packet pointer and appends the contents of that packet to
  the output.  When the '#' "modifier" is added to '\%p' (as in this
  case), it means append the packet contents, but print any
  'non-printable' ASCII characters in hexadecimal.)

 */
