2011/3/14 Jacky.Seraph Mun <jackyser...@gmail.com>: > Anyone has ideas? > > Basically, the question is why I cannot write data to the device > /dev/pts/1 after this device is taken by PPP daemon. > > Thanks > > 2011/3/11 Jacky.Seraph Mun <jackyser...@gmail.com>: >> Hello, >> >> >> I use the virtual channel daemon and the multiplex mode to create 2 >> channels to connect to GSM modem. One is for AT command and the other >> one is for gprs connection. >> The moment the APN is set, it will try to switch to data mode on the >> GPRS channel by sending some related AT commands and start the PPP >> daemon with it. Then the ppp net device is created and i am able to >> send and receive data by java socket over this device. >> >> But when I try to disconnect the gprs connection by changing APN, I >> got a problem that I can't send any at command to GPRS channel and >> always get writing error code 11 (EAGAIN). >> >> Actually most of my code is based on freerunner froyo. >> >> My GSM modem is SIM900A. >> >> The gprs channel is opened by >> >> >> fd_gprs = open ("/dev/pts/1", O_RDWR | O_NONBLOCK); >> if ( fd_gprs >= 0 ) { >> struct termios ios; >> tcgetattr(fd_gprs, &ios); >> ios.c_lflag = 0; >> cfsetispeed(&ios, B115200); >> cfsetospeed(&ios, B115200); >> tcsetattr(fd_gprs, TCSANOW, &ios ); >> } >> >> The pppd is started with the options: >> >> /dev/pts/1 >> user >> password >> unit 1 >> noauth >> nodetach >> default-asyncmap >> ipcp-accept-local >> ipcp-accept-remote >> usepeerdns >> defaultroute >> >> >> >> The disconnecting AT command I sent is >> >> >> int at_deactivate_modem(struct ATChannels *ATch) >> { >> ... >> ioctl(ATch->s_fd, TIOCSBRK, 0); >> ioctl(ATch->s_fd, TIOCSBRK, 0); >> ioctl(ATch->s_fd, TIOCSBRK, 0); >> >> err = at_send_command_full_nolock (ATch, "+++AT", NO_RESULT, >> NULL, NULL, CLOSE_TIMEOUT_MSEC, >> NULL); >> >> /* some stacks start with verbose off */ >> err = at_send_command_full_nolock (ATch, "ATH", NO_RESULT, >> NULL, NULL, CLOSE_TIMEOUT_MSEC, >> NULL); >> >> err = at_send_command_full_nolock (ATch, "AT+CGACT=0", NO_RESULT, >> NULL, NULL, CLOSE_TIMEOUT_MSEC, >> NULL); >> >> err = at_send_command_full_nolock (ATch, "AT+CGATT=0", NO_RESULT, >> NULL, NULL, CLOSE_TIMEOUT_MSEC, >> NULL); >> ... >> } >> >> The err is always -1 and the errno is set to 11 accordingly. >> >> Could anyone has any ideas on this issue? >> >> >> >> Thanks, >> >> Jack >> >
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