I am using Telit GL865 GSM Modem with STM32F7 nucleo development board. I make them communicate via USART1. Firstly, I configure the modem with AT commands as below; after that, modem starts to send LCP packages and since I cannot handle them, NO CARRIER message occurs at the end.
What I am not sure is that am I applying the right AT commands since it is different than the link I am sharing:
https://github.com/espressif/esp-idf/blob/master/examples/protocols/pppos_client/main/pppos_client_main.c
The second thing is, when I callpppos_create(&ppp_netif, output_cb, status_cb, 0), I observe that it actually does not call status_cb(ppp_pcb *pcb, int err_code, void *ctx).
main code and required callbacks:
/////////////////////////// Includes
#include "main.h"
#include "stm32f7xx_hal.h"
#include "lwip.h"
#include "usart.h"
#include "gpio.h"
#include <stdio.h>
#include <stdarg.h>
#include <time.h>
#include "string.h"
#include "lwip/opt.h"
#include "lwip/sys.h"
#include "lwip/timeouts.h"
#include "lwip/debug.h"
#include "lwip/stats.h"
#include "lwip/init.h"
#include "lwip/tcpip.h"
#include "lwip/netif.h"
#include "lwip/api.h"
#include "lwip/tcp.h"
#include "lwip/udp.h"
#include "lwip/dns.h"
#include "lwip/dhcp.h"
#include "lwip/autoip.h"
#include "lwip/etharp.h"
#include "netif/ethernet.h"
#include "lwip/apps/netbiosns.h"
#include "lwip/apps/httpd.h"
#include "netif/ppp/pppos.h"
#include "ppp/ppp.h"
#include "lwip/sio.h"
#include "netif/ppp/pppapi.h"
#include "netif/ppp/pppos.h"
#include "netif/ppp/pppoe.h"
#include "netif/ppp/ppp_opts.h"
///////////////////////////////////////////// ///End of Includes
void SystemClock_Config(void);
#define RX_SIZE 64
///////////////////////////////////////////////////////Variables
uint32_t sysTickCounter = 0;
uint8_t sendData[50] = " \n";
uint8_t recData;
uint8_t receivedValue, connected = 0;
uint32_t recIndex = 0;
uint8_t recBuffer[RX_SIZE];
uint8_t pppLinkStatusCallbackArray[RX_SIZE];
uint8_t sent,sendMeToPPPoS = 0;
ppp_pcb *ppp;
struct netif ppp_netif;
u8_t sio_idx = 0;
sio_fd_t ppp_sio;
uint8_t ATconnected,lcpCame,length = 0;
uint8_t lcpStartIndex, lcpStopIndex,lcpStartOld,lcpStart,lcpStop = 0;
////////////////////////////////////////////////////////////End of Variables
////////////////////////////////////////////////////////////PPP Functions
static void status_cb(ppp_pcb *pcb, int err_code, void *ctx) {
//this function is never called; however, it must have been called in the main with ppp = pppos_create(&ppp_netif, output_cb, status_cb, 0);
struct netif *pppif = ppp_netif(pcb);
LWIP_UNUSED_ARG(ctx);
switch(err_code) {
case PPPERR_NONE: {
printf("status_cb: Connected\n");
printf(" our_ipaddr = %s\r\n", ipaddr_ntoa(&pppif->ip_addr));
printf(" his_ipaddr = %s\r\n", ipaddr_ntoa(&pppif->gw));
printf(" netmask = %s\r\n", ipaddr_ntoa(&pppif->netmask));
connected = 1; //
break;
}
case PPPERR_PARAM: {
printf("status_cb: Invalid parameter\r\n");
break;
}
case PPPERR_OPEN: {
printf("status_cb: Unable to open PPP session\r\n");
break;
}
case PPPERR_DEVICE: {
printf("status_cb: Invalid I/O device for PPP\r\n");
break;
}
case PPPERR_ALLOC: {
printf("status_cb: Unable to allocate resources\r\n");
break;
}
case PPPERR_USER: {
ppp_free();
printf("status_cb: User interrupt\r\n");
break;
}
case PPPERR_CONNECT: {
printf("status_cb: Connection lost\r\n");
break;
}
case PPPERR_AUTHFAIL: {
printf("status_cb: Failed authentication challenge\r\n");
break;
}
case PPPERR_PROTOCOL: {
printf("status_cb: Failed to meet protocol\r\n");
break;
}
case PPPERR_PEERDEAD: {
printf("status_cb: Connection timeout\r\n");
break;
}
case PPPERR_IDLETIMEOUT: {
printf("status_cb: Idle Timeout\r\n");
break;
}
case PPPERR_CONNECTTIME: {
printf("status_cb: Max connect time reached\r\n");
break;
}
case PPPERR_LOOPBACK: {
printf("status_cb: Loopback detected\r\n");
break;
}
default: {
printf("status_cb: Unknown error code %d\r\n", err_code);
break;
}
}
ppp_connect(pcb, 30);//Try to reconnect in 30 seconds
}
static u32_t output_cb(ppp_pcb *pcb, u8_t *data, u32_t len, void *ctx)
{
//UART output callback for PPPoS
return HAL_UART_Transmit_IT(&huart1, data, sizeof(data));
}
/////////////////////////////////////////////////////////End of PPP Functions
/////////////////////////////////////////////////////////////////////////Main
int main(void)
{
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
MX_USART1_UART_Init();
MX_LWIP_Init();
HAL_UART_Receive_IT(&huart1, &recData, 1);
SysTick_Config(SystemCoreClock/1000);
HAL_Delay(300);//delay 300ms
memset(recBuffer, 0, sizeof(recBuffer));//UART receive buffer
HAL_UART_Transmit_IT(&huart1, (uint8_t*)"AT\r\n", strlen("AT\r\n"));//send this AT command over UART to GSM module
HAL_Delay(300);
HAL_Delay(300);
memset(recBuffer, 0, sizeof(recBuffer));
HAL_UART_Transmit_IT(&huart1, (uint8_t*)"AT&K0\r\n", strlen("AT&K0\r\n"));
HAL_Delay(300);
HAL_Delay(300);
memset(recBuffer, 0, sizeof(recBuffer));
HAL_UART_Transmit_IT(&huart1, (uint8_t*)"AT#SCFG=3,1,300,600,300,10\r\n", strlen("AT#SCFG=3,1,300,600,300,10\r\n"));
HAL_Delay(300);
HAL_Delay(300);
memset(recBuffer, 0, sizeof(recBuffer));
HAL_UART_Transmit_IT(&huart1, (uint8_t*)"AT+CGDCONT=1,\"IP\",\"mgbs\",\"0.0.0.0\",0,0\r\n", strlen("AT+CGDCONT=1,\"IP\",\"mgbs\",\"0.0.0.0\",0,0\r\n"));
HAL_Delay(300);
HAL_Delay(300);
memset(recBuffer, 0, sizeof(recBuffer));
HAL_UART_Transmit_IT(&huart1, (uint8_t*)"AT+CGSN\r\n", strlen("AT+CGSN\r\n"));
HAL_Delay(300);
HAL_Delay(300);
memset(recBuffer, 0, sizeof(recBuffer));
HAL_UART_Transmit_IT(&huart1, (uint8_t*)"AT#ICMP=2\r\n", strlen("AT#ICMP=2\r\n"));
HAL_Delay(300);
HAL_Delay(300);
memset(recBuffer, 0, sizeof(recBuffer));
HAL_UART_Transmit_IT(&huart1, (uint8_t*)"AT#GPPPCFG=\"000.000.000.000\",25,1\r\n", strlen("AT#GPPPCFG=\"000.000.000.000\",25,1\r\n"));
HAL_Delay(300);
HAL_Delay(300);
memset(recBuffer, 0, sizeof(recBuffer));
HAL_UART_Transmit_IT(&huart1, (uint8_t*)"AT#GPPPCFGEXT=0\r\n", strlen("AT#GPPPCFGEXT=0\r\n"));
HAL_Delay(300);
HAL_Delay(3000);
memset(recBuffer, 0, sizeof(recBuffer));
HAL_UART_Transmit_IT(&huart1, (uint8_t*)"AT#GAUTH=0\r\n", strlen("AT#GAUTH=0\r\n"));
HAL_Delay(3000);
HAL_Delay(300);
memset(recBuffer, 0, sizeof(recBuffer));
HAL_UART_Transmit_IT(&huart1, (uint8_t*)"ATDT*99#\r\n", strlen("AATDT*99#\r\n"));
ppp = pppos_create(&ppp_netif, output_cb, status_cb, 0);
ppp_set_auth(ppp, PPPAUTHTYPE_NONE, "", "");
ppp_set_default(ppp);
u16_t holdoff = 0;
err_t err = ppp_connect(ppp, holdoff);
while(err!=ERR_OK)
{
HAL_Delay(100);
}
while (1)
{
}
}
/////////////////////////////////////////////////////////////UART callbacks
//////////////Fill the buffer with UART data unless 300ms past
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *UartHandle)
{
if (UartHandle->Instance == USART1)
{
//HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_7);/* Toggle LED2 on: Transfer in reception process is correct */
sysTickCounter = 0;//reset the timeout if data is received --> for more info, go to systick_handler
HAL_UART_Receive_IT(&huart1, &recData, 1);
if(recIndex >= RX_SIZE){
recIndex = 0;
}
recBuffer[recIndex++] = recData;
}
}
/////////////////////////////////////////////End of UART callbacks
//////////////below; store the received LCP packages from UART buffer to pppos_input by
//////////////dicriminating the LCP packages with starting and ending indicators 0x7E.
void SysTick_Handler(void)
{
sysTickCounter++;
if(sysTickCounter == 300){ //Check the UART buffer over 300ms
sysTickCounter = 0;
recIndex = 0;
for (int i = 0; i < RX_SIZE; i++){
if(recBuffer[i] == 0x7E){
if(lcpStart == 0){
lcpStart = 1;
}else if(lcpStart == 1){
lcpStart = 0;
}
}
if(lcpStart == 1){
lcpBuffer[lcpBufferIndex] = recBuffer[i];
lcpBufferIndex++;
}
if(lcpStart == 0){
if(lcpStartOld == 1){
quantityOfPackages++;
lcpBuffer[lcpBufferIndex] = 0x7E;
length = lcpBufferIndex;
lcpBufferIndex = 0;
pppos_input(ppp, lcpBuffer, length);
memset(recBuffer, 0, sizeof(recBuffer));
memset(lcpBuffer, 0, sizeof(lcpBuffer));
}
}
lcpStartOld = lcpStart;
}
}
HAL_IncTick();
HAL_SYSTICK_IRQHandler();
}
I want the PPPoS handle the static IP assignment for LwIP. However, I could not even handle the LCP messages coming from the GSM Module since I could not properly create PPPoS via pppos_create(&ppp_netif, output_cb, status_cb, 0);.
what modem sends all including LCP is below:
AT
AT
OK
AT&K0
AT&K0
OK
AT#SCFG=3,1,300,600,300,10
AT#SCFG=3,1,300,600,300,10
OK
AT+CGDCONT=1,"IP","mgbs","0.0.0.0",0,0
AT+CGDCONT=1,"IP","mgbs","0.0.0.0",0,0
OK
AT+CGSN
AT+CGSN
356308046338494
OK
AT#ICMP=2
AT#ICMP=2
OK
AT#GPPPCFG="000.000.000.000",25,1
AT#GPPPCFG="000.000.000.000",25,1
OK
AT#GPPPCFGEXT=0
AT#GPPPCFGEXT=0
OK
ATD*99***1
ATD*99***1
NO CARRIER
ATDT*99#
ATDT*99#
CONNECT
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NO CARRIER
