Make sure that the baud rate passed to beginSerial() in your Arduino code matches the baud rate in the serproxy.cfg file. Also be sure that nothing else is trying to use COM10 at the same time as the serproxy.
Does the serial monitor in the Arduino IDE show you
data coming from the board on COM10? (Again, make sure that the baud rate in the "Tools | Serial Monitor Baud Rate" matches the argument to beginSerial().)
Can you upload sketches to the board using COM10?