Tidying up.
Nil.
Added timeout code for ready response.  Not tested.
Fixed error message.  Cancel button also added during connecting.
Nil.
Removed VB folders and unused CmdMessenger sample code.
Tidied up folder names.  Solution still builds and runs OK but not fully
tested.
Removed old sketch folders.
Changed loop to counter.  Builds ok.  Not yet tested.
Nil.
Nil.
Added DtrEnable = true to client for compatibility with Nano.
Nil.
New loop approach tested and seems to work ok.
Changed sweep frequency.  Refactored sweep DAC range calculations.
Nil.
Added debug command / response to sketch.  Added test code for returning
a response value.
Added debug button, command and response handling to client.  Tested OK
with test stub on sketch.  Also updated protocol version to "R".
Finished testing with debug.  Debug commands and sample measurement code
left in client and sketch.
Nil.