Added basic handling of set command.
Taking out debug code.
Nil.
Starting new version of full sketch based on test harness.
Nil.
Nil.
Starting updates.
Updates.
More updates.
Communicates OK with client.  Need to test frequency and DAC output.
Nil.
Added I2C error handling.
Removing debug code.
Fixed type issues in frequency calculation.  Tested lower sweep
frequency is correct.