PaulS:
dimis90:
anyone knows how can I see what serial port of arduino is receiving ? I can't use serial monitor because port is already in use when i run the code so is there another way to see what is receiving ?The application that is sending data to the Arduino needs to have a way of reading data that the Arduino sends. If it does, you are out of luck.
You could, of course, use the Serial Monitor application to send data to the Arduino in the format that you think that application is sending the data. Make the Arduino deal with the known format. If the Arduino then deals with the unknown format data in the same way, then you were correct in guessing what the application is sending. If not, you weren't. So, you make another guess.
I kinda lost you. Could you please simplify it ?