[lwip-users] LWIP+PPPos(GPRS)

[bakmurat]

*I am designing a gateway and on my ATSAME53N20 (Atmel studio 7 IDE) I have
to connect a 3G modem(Quactel UG95) using a serial port. I can communicate
with the modem using AT commands. Now, I would like to use PPPos (PPP over
serial) library from LWIP 2.03 to enter in PPP mode. FreeRTOS has to
implement as this project will be running in a threaded environment.

*Firstly, I have completed all the necessary AT commands and dialed up
ATD*99***1#. Everything is working as expected. 

* Secondly, I need to proceed with LWIP(PPPos support) in order to get the
IP address. This part is
bit tough. I wrote some APIs such as sio_, sys_jiffies and linkStatusCB
functions and tried to open serial communication but it's not successful.
Link status call back says that there is a "connection lost" error. I
couldn't figure it out. 

*Modem transmits the following data:
CONNECT 7200000                                                                 
~ÿ}#À!}!}!} }8}"}&} } } } }#}$À#}%}&R}8}0D}'}"}(}"™Ë~...  ...~ÿ}
#À!}!}!} }8}"}&} } } } }#}$À#}%}&R}8}0D}'}"}(}"™Ë~                              
NO CARRIER 

*MCU trasmits the following command and data:
ATD*99***1#                                                                     
~ÿ}#À!}!}!} }4}"}&} } } } }%}&[[ì} }'}"}(}"`?~

*my code goes at follows:

static void tcpip_init_done(void *arg)
{
        if (arg) {
                *((bool *)arg) = 1;
        }
}

tcpip_init(tcpip_init_done, &setup); //tcpip init.
while (!setup) {
sleep(1);
}

io_write(usart, ATppp, sizeof(ATppp)/sizeof(ATppp[0]));//dials ATD*99#
vTaskDelay(1000);
pppos_example_init();
                        
while(connected==0){
io_write(usart1, (uint8_t*)"Cant connect wait\r\n", 21);
vTaskDelay(1000);
}
if (connected)
{
io_write(usart1, (uint8_t*)"Success\r\n", 11);
}

*** My example function
static sio_fd_t ppp_sio;
static ppp_pcb *ppp;
static struct netif pppos_netif;

pppos_example_init(void)
{
  ppp_sio = sio_open(0);

  if(!ppp_sio)
  {
      //perror("PPPOS example: Error opening device");
      return;
  }
  ppp_init();
  ppp = pppos_create(&pppos_netif, ppp_output_cb, ppp_link_status_cb, NULL);
  if (!ppp)
  {
     // printf("PPPOS example: Could not create PPP control interface");
      return;
  }

#ifdef LWIP_PPP_CHAP_TEST
  ppp_set_auth(ppp, PPPAUTHTYPE_CHAP, "lwip", "mysecret");
#endif

  ppp_connect(ppp, 0);
  

#if LWIP_NETIF_STATUS_CALLBACK
  netif_set_status_callback(&pppos_netif, netif_status_callback);
#endif /* LWIP_NETIF_STATUS_CALLBACK */

  sys_thread_new("pppos_rx_thread", pppos_rx_thread, NULL, 1048, 1);
#endif /* PPP_SUPPORT */
}

***Other functions

ppp_output_cb(ppp_pcb *pcb, u8_t *data, u32_t len, void *ctx)
{
  return sio_write(ppp_sio, data, len);
}


***PPP thread

static void pppos_rx_thread(void *arg)
{
  u32_t len;
  u8_t buffer[128] = {0};
  LWIP_UNUSED_ARG(arg);

    while (1) {
    len = sio_read(ppp_sio, buffer, sizeof(buffer));
    if (len > 0) {
      pppos_input_tcpip(ppp, buffer, len);
    }
  }
}




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