New answers tagged nxt
0
I have a strong suspicion that your COM3 is connected to BlueTooth so your Python program can't connect.
I would go through the information in the NXT Bluetooth Developer Kit (available from the LEGO MINDSTORMS download page) to troubleshoot the process.
Beyond that, this sounds like a potential general BlueTooth issue, and not directly related to the NXT ...
Top 50 recent answers are included