I'm developing a small 3G connection manager under Windows using C++ and I can't understand how to send an SMS once a 3G connection is established via RasDial.
I have code to access a serial port and I understand the AT commands to send an SMS. This works fine if I can open the serial port. However, after a RasDial call, opening the serial port with CreateFile fails, as RAS seems to have exclusive access to it.
Has anyone an idea how other connection managers manage to get around this?