The text on the two upper lines is timing information. The second line gives information about how many blocks of unused data that were present at the exit from the respective function. This number has to be below 32 to make sure no data is overwritten. The receive main loop in RX.C gives full info about the timing info. This information is software development support only and will be removed.
Red dots mark current pointer positions and white dots mark used positions.
Dots at the right side of the box indicate buffer overflow. The receive main loop in RX.C gives full info about the buffer info. This information is software development support only and will be removed.