I'm working on BeagleBone Black (Debian running on it) and I have connected a 3G USB dongle (Huawei E173u-2) with it for GPRS and sending SMS.Now I am facing a problem when I am booting my board (dongle attached). I can access GPRS service, but cannot send SMS at the same time (using AT commands from MINICOM). If GPRS service is on and I am sending AT command to 3G USB dongle, I am getting a replyService Temporarily Unavailable.If I run command on terminalifdown gprs(service name)ie. GPRS service is OFF, now I am able to send SMS.In SMS mode if I run command in terminalifup gprs(service name)I am not able to get GPRS connection until I close MINICOM connection used to send AT commands to 3G USB Dongle.As I have searched about this issue, I have read a blog which says each service locks the port at which dongle is connected. Until service releases the port, other service cannot access the same port.I have tried this on Windows and found that I can access both services at the same time.What is the actual cause of this issue and how to resolve it?
Unable to use GSM and GPRS with 3G USB Dongle on BeagleBone Black at the same time
debian;modem;mobile;minicom;sms
Open /etc/ppp/options file and go to line number 65, just comment it.Line 65 is:lockChange it to#lockAnd reboot. 