* Fix cppcheck issues
Fixes the following cppcheck issues:
examples/SecretKnockSensor/SecretKnockSensor.ino
305 variableScope 398 style
The scope of the variable 'timeDiff' can be reduced.
examples/SensebenderGatewaySerial/SensebenderGatewaySerial.ino
127 variableScope 398 style
The scope of the variable 'led_state' can be reduced.
* Doxygenize MyMessage / Message manipulation
This should replace the static documentation at
http://korturl.nu/stupid
I have enabled existing comments and added new comments where
necessary. Feedback on syntax and contents is welcome.
added variant of MyMessage::set and sendSketchInfo that accept a
string that's stored in PROGMEM.
This avoids the need to (temporarily) store strings in memory to get
them into a message.
