What is this StandardFirmata_ModifiedAll code doing?

Yes, you are right I want to put start/pause button on the PC Screen, and also we need to match the COM and serial baud.
And after that I want the PC show the data from the variable looping inside the arduino.

Oh just dont care about that serial output, I don't need that, just put it there, I will just erase it.
It just shows the amount of "no1" variable has been counting up