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How to send AT commands to modem once the connection is established?

I have a zte 3g modem. I use carrier provided dialer for connection establishment. Once the ppp connection is active, i would like to send some AT commands(for ex. Query signal strength, AT+CSQ). But ...
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1answer
167 views

3G connection with wvdial gets no IP, exits with code 16

I am trying to establish a 3G connection with Raspbian, a 3G USB dongle, usb_modeswitch and wvdial. I followed this tutorial which has worked well before with a different 3G dongle. My 3G dongle is a ...
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/etc/resolv.conf changes during reboot

My ISP asked me to use custom nameserver settings. I have placed these in /etc/resolv.conf. Unfortunately, every time I reboot the computer, the contents of this file is changed. To connect to the ...
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1answer
167 views

Kernel pppd task hung after running over serial port

I am trying to run the ppp daemon on the console port of my board which has p2020 processor with Linux kernel 2.6.32. After running ppp interface ppp0 is not coming up and I get an error pppd blocked ...