A serial port demo shows how to use GPIOs to communicate through a second USB connection.
But as a Arduino developer I'm used to use the same USB for both programming and runtime communication.
Can I do the same with Netduino?
Electronic – arduino – use the Netduino USB as a serial port
arduinonetduino
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Best Answer
The problem is that the Netduino uses the USB port for communicating the debugging information required so you can live debug through visual studio.
It is possible to switch the Netduino and use an FTDI serial cable to do the programming/debugging which will leave the USB port free for communications. There is a thread about this on the Netduino forums.
There are also discussions here and here that confirm they are working on the problem.