[FretBoard] add support for Unknown activity status
[FretBoard] add support for Unknown activity status
tardate/LittleArduinoProjects,tardate/LittleArduinoProjects,tardate/LittleArduinoProjects,tardate/LittleArduinoProjects,tardate/LittleArduinoProjects,tardate/LittleArduinoProjects,tardate/LittleArduinoProjects,tardate/LittleArduinoProjects