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 the dialer i use locks the
/dev/ttyUSB0 port, which is the command port to send AT commands for my modem. So is there any way, to send the commands, once the connection is active?
Edit: I also tried the additional port /dev/ttyUSB1. But the port is flowing with random data from the modem. A sample is given below.
T^PREFMODE?? ^PREFMODE:8 OK TC ^DSDORMANT:1 +CSQ:19, 99 OK T^SYSINFO ^SYSINFO:2,3,0,4,255 OK TT^SYSINFO? ^SYSINFO:2,3,0,4,255
I tried adding my commands, i even got output. But the response is very poor. Most of the times, my AT commands went unnoticed.