Replace the repeated parsing lines with short functions to reduce the code size and increase the speed and code readability.

Example, the res variable generation that simply append a character recursively.

Implement all where it is possible

This method should be reviews as it seems not generating the right string. Method should be changed to create a return string instead of writing directly to the serial port.

The commandSender() method should be added to send command requests to the connected master (RPI master)

Add the missing commands to the parser.

The not yet supported commands are defined and documented in the CommandProcessor.h

The actual commandReturn() method should be replaced and the message string updated during the parsing process. When the parser exits (from any exit condition) the message object will contain the full response to the master that should be sent to the serial connection.

When the received commands+parameter string is parsed without errors should call the specific function method for execution.

In the same way of the Stethoscope template also all the other templates should be created and exectued by the E (Enable) command.