教你如何进行嵌入式网络模块的联网操作

作者：良知犹存

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总述

    现在物联网的概念越来越突出，软件云端小米IOT平台、阿里物联网云等等，嵌入式百度手环开源很久了，此外网上关于ESP8266接入网关进行远程控制的源码不计其数。

   物联网嵌入式端开发使用中都是各大主流网络模块，其中无线方式通信方式区分的话，主要分为两类：一类是Zigbee、WiFi、蓝牙、Z－wave等短距离通信技术；另一类是LPWAN（low－powerWide－AreaNetwork，低功耗广域网），即广域网通信技术。

   至于几种通信模块使用的技术区别，改天可以写一篇文章进行详细介绍。不过 今天我来介绍一下，我使用过的一款2G网络模块，在车载行驶中使用，在很恶劣的情况下，依旧可以保证网络快速链接。因为现在的网络模块都是差不多的，尤其是IOT、LORA以及2G 3G 4G这些通过基站进行组网的模块。

有兴趣的朋友可以看看百度手环的开源资料，后台回复 find me 加我好友进行分享。

 

 

一、概念介绍

 

2G：第二代移动通信技术加入更多的多址技术，包括TDMA和CDMA，同时2G是数字通信，因此在抗干扰能力上大大增强。第二代移动通信可以说对接下来的3G和4G奠定了基础，比如分组域的引入，和对空中接口的兼容性改造，使得手机不再只有语音、短信这样单一的业务，还可以更有效率的连入互联网（电路域也可以提供internet业务，只是相对来说分组域更适合internet业务）。2G主要的制式也是两个，分别是来自欧洲ETSI组织的GSM（GPRS/EDGE）和来自美洲以高通公司为主力的TIA组织的CDMA IS95/CDMA2000 1x。

    看到这里大家就有疑问了，上面巴拉巴拉一堆介绍中，2G网络看上去都是很落后的了，毕竟现在5G都出了。2G都没人用了，有什么好讲的。那我这里就给2G正个名。

 

    现在网络通信技术发展的很快，手机等终端对最新通信技术的支持也是很及时，但是也是在手机这块。要知道手机现在的售价是很高的，在长时间的快速更新换代中，消费者也逐渐接受了这些技术指标以及消费价格。但是在一些工业领域，物联网产品中，只要很小的带宽，网络覆盖率广，流量费用足够低，甚至需要低功耗的模块。IOT LORA就是现在物联网选择比较多的模块，但是IOT依旧 也有自己的缺点。

    “NB-IOT实际使用没有理论宣传那么好，NB-IOT，功耗低、传输距离远、系统容量大，这些都是耳熟能详的好处了。但是，功耗低：在大部分场景下，NB并不比2G功耗低多少;传输距离远：现在2G网络全覆盖，NB-IOT还在铺网阶段，体现不出来优势;系统容量大：当前物联网产品远远没有把2G网络占满，更体现不出来NB能容纳更多设备的优势了。价格贵：NB-IOT模块比2G模块贵3-4倍，算上运营商补贴还是要贵不少。”

 

    而2G由于通信模块成本较低，不到4G模块的三分之一。市面上的共享单车定位和开锁、POS刷卡支付也采用2G网络连接。所以2G网络现阶段应用还是比较广的，所以我们之前也是采用了2G网络模块进行的开发。

 

二、模块情况

    2G模块比较有名就是上海移远公司的M26模块，出来时间比较长了，但是M26只有GPRS的功能。

 

所以我们选择了中移的M6313模块GPRS和GNSS二合一模块。相关的资料现在也是很多了，一般我们用到是AT命令使用手册，通信流程示例手册。通信手册我开发的时候还没有，现在中移出了，挺开心的，又解决了开发者的一些难题。

 

首先我们开发使用是也是云，嵌入式端没有使用现在比较火的MQTT或者CoAP这些协议，而是直接使用TCP进行端口链接到服务器。

 

因为M6313模块的功能和M26很像，所以这个TCP链接过程是可以沿用的。

三、联网状态机分析

  

 下面是当初开发时候的写一个联网状态机，最后基本达到在CSQ在12~24时候，联网时候可以最快达到4~5秒。

 

这个状态机可以实现联网，设置模块自动心跳、切换IP等功能。具体的解释也都在代码里面展示了。

static void TCP_Conncect(const char* ipaddr, const char* ipport){  char* p = NULL;  p = (char*) malloc(100);  if(NULL == p)  {    LOG("malloc p error!\r\n");  }  else  {    memset(p, 0, 100);    sprintf(p, "AT+QIOPEN=\"TCP\",\"%s\",%s",ipaddr, ipport);    mdm_send_cmd_noack((u8*)p);    LOG("%s\r\n", p); //DEBUG  }  free(p);  }/*  ******************************************************************  * @brief   进行IP修改时候IP正确性标志清零  * @author  Conqueror(征服者)  * @version V1.0  * @date    2019-6-10  *******************************************************************/ u8 IsIPvalid = 0;static void ChangeIP(void){  IsIPvalid = 0;  dprintf("Clear IsIPvalid!\r\n");}/*  ******************************************************************  * @brief   timer.c进行调用此函数进行判断IP是否正常通讯  * @author  Conqueror(征服者)  * @version V1.0  * @date    2019-6-17  *******************************************************************/ TimTypeDef SecIPTimeManage;void SecIPManageTimer(void){  if(SecIPTimeManage.stat == TON)  {   (SecIPTimeManage.cunt < SecIPTimeManage.des)?(SecIPTimeManage.cunt++):\   (TimerManageInit(&SecIPTimeManage,TOFF,0),IsIPvalid=0);  }  }/*  ******************************************************************  * @brief   IP为正确可用的，可以进行写进FLASH  * @author  Conqueror(征服者)  * @version V1.0  * @date    2019-6-17  *******************************************************************/ void IPValid(void){  if(devParam.secondTcp.addr[0] !=0)  {    IsIPvalid=1;    TimerManageInit(&SecIPTimeManage,TOFF,0);    LOG("IP Valid !\r\n");  }}/*  ******************************************************************  * @brief   用于第一次连接新的IP地址的时候进行发送测试  * @author  Conqueror(征服者)  * @version V1.0  * @date    2019-6-17  *******************************************************************/ static void TestTCP(void){  if(cntMdm == 1 && devParam.secondTcp.addr[0] !=0)  {      M6313SendTestData();/*确认IP情况*/      TimerManageInit(&SecIPTimeManage,TON,2000);/*20s判断*/  }}/*  ******************************************************************  * @brief   判断IP是否正确，不正确直接清零  * @author  Conqueror(征服者)  * @version V1.0  * @date    2019-6-17  *******************************************************************/ void IsTCPIPVaild(void){  if(gCnt.mdmTotalErr > 3&&mdmInfo.signalIntensity > 10)  {    memset(&devParam.secondTcp,0x00,sizeof(devParam.secondTcp));/*只要新的进入则清除之前的数据*/  }  if(IsIPvalid == 0 && SecIPTimeManage.stat == TOFF && cntMdm==1\                    && econdTcp.addr[0] !=0)  {    LOG("IPInvalid !\r\n");    mdmFSMPWRRSTInit(); /*断电重启*/        memset(&devParam.secondTcp,0x00,sizeof(devParam.secondTcp));/*只要新的进入则清除之前的数据*/  }}​void mdmFSMPWRRSTInit(void) {  MDM_STA = MDM_EXE_PWRRST_ACT;          /*设置mdmComFSM状态*/    TBoxInfoType.userInfo.bit.cntMdm = 0;  /*网络默认断开*/    SysFlag.mdmFSMRunSta = 1;              /*启动MDM_FSM,TCP错误处理程序将在一定时间内不执行*/    gtimer.mdmFSMRun = gtimer.timer;       /*MDM_FSM处理,开始时刻*/    dprintf("-mdmFSM_PWRRST_Init\r\n");    }​void STOP_MDM_FSM(void){  SysFlag.mdmFSMRunSta = 0; /*MDM_FSM强制结束*/  gtimer.mdmFSMRun = 0;}​​void mdmComFSM(void){  static u8 iTimes = 0;      /*发AT CMD次数*/  static u8 mdmPwrOnCnt = 0; /*MDM开机次数*/​  if(MDM_STA != MDM_IDLE_STA) /*FSM运行中,刷新*/  {    refreshWorkTimer();  }    switch(MDM_STA)  {    case MDM_IDLE_STA:         break;/*----------------------------------------------------------------------------------------------------------------------------------------------------------------------*/        /*模块断电复位*/    case MDM_EXE_PWRRST_ACT:      LOG("*%d<-:MDM_PWR_RST[T:%d]\r\n", MDM_EXE_PWROFF_ACT, gtimer.timer);      MDM_PWR_EN_L;      gtimer.mdmFSMTimerout = 0;      MDM_STA = MDM_WAIT_PWRRST_RES;                break;    case MDM_WAIT_PWRRST_RES:      if(gtimer.mdmFSMTimerout > 2000) /*超过10秒*/      {        gtimer.mdmFSMTimerout = 0;        MDM_PWR_EN_H;        LOG("MDM_PWR_EN_H!\r\n");        MDM_STA = MDM_EXE_PWRON_ACT;         LOG("MDM_PWR_RST Finish!\r\n");      }      break;            /*模块关机*/         case MDM_EXE_PWROFF_ACT: /*模块关机:开机状态模块的PWRKEY拉低1s关机*/      LOG("\r\n*Step:%d,MDM_EXE_PWROFF_ACT,time:%d\r\n", MDM_EXE_PWROFF_ACT, gtimer.timer);      MDM_PWRKEY_EN_H;      gtimer.mdmFSMTimerout = 0;      MDM_STA = MDM_WAIT_PWROFF_RES;                break;    case MDM_WAIT_PWROFF_RES:      if(gtimer.mdmFSMTimerout > 200) /*超过1秒*/      {        gtimer.mdmFSMTimerout = 0;        MDM_PWRKEY_EN_L;  /*m6313的PWRKEY处产生高电平*/                          MDM_STA = MDM_WAIT_PWROFF_DELAY;        LOG("MDM_PWRKEY_EN_L,PWROFF_time:%d\r\n", gtimer.timer);      }      break;          case MDM_WAIT_PWROFF_DELAY:      if(gtimer.mdmFSMTimerout > 2400) /*12秒等待,模块关机完成*/      {        LOG("MDM_POWER_OFF finish\r\n");        MDM_STA = MDM_EXE_PWRON_ACT;                         }        break;        /*模块开机*/      case MDM_EXE_PWRON_ACT: /*模块开机:在关机状态模块的PWRKEY拉低2s开机*/      LOG("\r\n*Step:%d,MDM_EXE_PWRON_ACT,time:%d\r\n", MDM_EXE_PWRON_ACT,gtimer.timer);      M6313ComInit();      MDM_PWRKEY_EN_H;      gtimer.mdmFSMTimerout = 0;      MDM_STA = MDM_WAIT_PWRON_RES;                break;    case MDM_WAIT_PWRON_RES:      if(gtimer.mdmFSMTimerout > 400) /*超过2秒*/      {        MDM_PWRKEY_EN_L; /*PWRKEY开机流程结束*/        mdmPwrOnCnt++;        LOG("MDM_POWER_ON,,time:%d\r\n", gtimer.timer);          MDM_STA = MDM_TX_AT_CMD;                           }          break;        /*检查MDM通信*/        case MDM_TX_AT_CMD:       LOG("\r\n*Step:%d,AT\r\n", MDM_TX_AT_CMD);//step 1      LOG("AT-%d-\r\n", iTimes);      mdm_send_cmd_noack((u8*)"AT");​      iTimes++;            gtimer.mdmFSMTimerout = 0;      MDM_STA = MDM_WAIT_AT_RES;      break;    case MDM_WAIT_AT_RES:      if(!mdm_check_str((u8*)"OK")) /*查询到OK*/      {        LOG("AT-OK-%d-\r\n", iTimes);​        if(mdmPwrOnCnt > 0)        {          MDM_STA = MDM_WAIT_GSM_READY; /*模块开机,需要一定时间,等待GSM注册成功*/          gtimer.mdmFSMTimerout = 0;        }        else{          MDM_STA = MDM_START_INIT;            }      }      else if(gtimer.mdmFSMTimerout > 400) /*本次等待2秒超时*/      {        if(iTimes < EXE_AT_TIMES)         {          MDM_STA = MDM_TX_AT_CMD; /*继续发送AT*/          LOG("continue-%d- send\"AT\"\r\n", iTimes);        }        else /*iTimes超过次数*/        {           iTimes = 0;          LOG("AT error,%d times\r\n", EXE_AT_TIMES);                    if(mdmPwrOnCnt < EXE_MDM_PWRON_TIMES)          {            MDM_STA = MDM_EXE_PWRON_ACT;       //进入开机流程            LOG(".MDM_EXE_PWRON_ACT\r\n");          }          else          {            mdmPwrOnCnt = 0; /*开机次数清零*/            MDM_STA = MDM_IDLE_STA;            STOP_MDM_FSM(); /*MDM_FSM结束*/                 gCnt.mdmTotalErr++;            LOG("send \"AT\" %d times error,mdmTotalErr++\r\n", EXE_AT_TIMES);          }        }      }            break;​          case MDM_WAIT_GSM_READY: /*等待GSM网络注册成功*/      if(!mdmWaitGSMReady())      {        MDM_STA = MDM_START_INIT; /*GSM注册成功*/        LOG("MDM_GSM_READY\r\n");      }      else if(gtimer.mdmFSMTimerout > WAIT_GSM_READY_MAX_TIME)       {        MDM_STA = MDM_START_INIT; /*GSM注册失败*/        LOG("MDM_GSM_NO_READY\r\n");      }      break;                   /*MDM初始化配置*/      case MDM_START_INIT: /*开始初始化*/      LOG("\r\n*Step:%d,MDM_START_INIT\r\n", MDM_START_INIT);      MDM_STA = MDM_TX_ATQINDI_CMD;      break;​    #if 1     //190115        case MDM_TX_ATQINDI_CMD://AT+QINDI配置是否缓存接收到的数据         LOG("*%d<-:AT+QINDI=2[%d]\r\n", MDM_TX_ATQINDI_CMD, iTimes);      mdm_send_cmd_noack((u8*)"AT+QINDI=2");  //0-不缓存 2-缓存模式            iTimes++;      MDM_STA = MDM_WAIT_ATQINDI_RES;      gtimer.mdmFSMTimerout = 0;      break;    case MDM_WAIT_ATQINDI_RES:      if(!mdm_check_result((u8*)"OK"))      {        MDM_STA = MDM_TX_ATCMVERSION_CMD;         LOG("->:OK[%d]\r\n", iTimes);                gCnt.fsmErrCnt = 0;      }      else if(!mdm_check_result((u8*)"ERROR"))      {        MDM_STA = MDM_TX_ATCMVERSION_CMD;         LOG("->:ERROR[%d]\r\n", iTimes);                gCnt.fsmErrCnt = 0;        if(iTimes < 3) //190220        {          MDM_STA = MDM_TX_ATQINDI_CMD;         }        else        {          iTimes = 0;          MDM_STA = MDM_TX_ATCMVERSION_CMD;           LOG("AT+QINDI=2,error 3 times!\r\n");                  gCnt.fsmErrCnt++;                  }      }      else if(gtimer.mdmFSMTimerout > 400)      {        if(iTimes < 3)         {          MDM_STA = MDM_TX_ATQINDI_CMD;         }        else        {          iTimes = 0;          MDM_STA = MDM_TX_ATCMVERSION_CMD;           LOG("AT+QINDI=2,error 3 times!\r\n");                  gCnt.fsmErrCnt++;                  }      }      break;      #endif                        /*查版本*/    case MDM_TX_ATCMVERSION_CMD:       LOG("*<-%d:AT+CMVERSION\r\n", MDM_TX_ATCMVERSION_CMD);        memset(USART1_RX_BUF, 0, sizeof(USART1_RX_BUF));          mdm_send_cmd_noack((u8*)"AT+CMVERSION");      MDM_STA = MDM_WAIT_ATCMVERSION_RES;      gtimer.mdmFSMTimerout = 0;      break;    case MDM_WAIT_ATCMVERSION_RES:            if(!mdm_check_str((u8*)"M6313"))      {          char* p = strstr((const char*)USART1_RX_BUF, (const char*)"M6313"); /*USART1_RX_STA被mdm_check_str清0了*/        if(NULL != p)//格式:M6313-MBRH0S02-release-EXT-20181025        {          char* p1 = NULL;                                        p1 = strchr((const char*)USART1_RX_BUF, '-');    /*第一个'-'内容*/          if(NULL !=p1)          {               strncpy(mdmInfo.MDMSoftInfo, p1+1, 8); /*取"MBRH0S02"*/                      }                            char* p2 = NULL;           p2 = strrchr((const char*)USART1_RX_BUF, '-');   /*最后一个'-'内容*/          if((NULL!=p2) && (p2!=p1))          {            strncpy(&mdmInfo.MDMSoftInfo[8], p2+3, 6);/*取"181025"*/          }          mdmInfo.MDMSoftInfo[14] = '\0';          p1 = NULL;            p2 = NULL;                                    LOG("Copy...\r\n");                  }        else        {          LOG("Copy error!\r\n");        }                  p = NULL;​​        MDM_STA = MDM_TX_ATQITKA_CMD;                 LOG("->:M6313...\r\n");              }      else if(gtimer.mdmFSMTimerout > 200)      {​        MDM_STA = MDM_TX_ATQITKA_CMD;               LOG("Fault\r\n");              }      break;                  /*TCP自动心跳 AT+QITKA=< keepalive >[,][,][,< keepcount>]*/    //MDM_AUTO_TICK_EN        case MDM_TX_ATQITKA_CMD:       LOG("*<-%d:AT+QITKA=1,60,300,3\r\n", MDM_TX_ATQITKA_CMD);                mdm_send_cmd_noack((u8*)"AT+QITKA=1,60,300,3");       MDM_STA = MDM_WAIT_ATQITKA_RES;      gtimer.mdmFSMTimerout = 0;      break;    case MDM_WAIT_ATQITKA_RES:            if(!mdm_check_str((u8*)"OK"))      {        MDM_STA = MDM_TX_ATQSCLK_CMD;        LOG("->:OK\r\n");            }      else if(gtimer.mdmFSMTimerout > 200)      {        MDM_STA = MDM_TX_ATQSCLK_CMD;        LOG("Fault\r\n");              }      break;    /*设置慢时钟*/    case MDM_TX_ATQSCLK_CMD: /*慢时钟*/       LOG("\r\n*Step:%d,AT+QSCLK\r\n", MDM_TX_ATQSCLK_CMD);      mdm_send_cmd_noack((u8*)"AT+QSCLK=1"); /*开启慢时钟*///修改 lyn 2018.10.6​      MDM_STA = MDM_WAIT_ATQSCLK_RES;      gtimer.mdmFSMTimerout = 0;      break;    case MDM_WAIT_ATQSCLK_RES:      if(!mdm_check_str((u8*)"OK"))       {        MDM_STA = MDM_TX1_ATGSN_CMD;        LOG("AT+QSCLK=1 ok\r\n");      }      else if(gtimer.mdmFSMTimerout > 200) /*1s超时*/      {        MDM_STA = MDM_TX1_ATGSN_CMD;        LOG("AT+QSCLK=1 error\r\n");      }      break;           /*第1次读取IMEI*/    case MDM_TX1_ATGSN_CMD:       LOG("\r\n*Step:%d,read IMEI\r\n", MDM_TX1_ATGSN_CMD);      mdm_send_cmd_noack((u8*)"AT+GSN"); /*读取IMEI*/      MDM_STA = MDM_WAIT1_ATGSN_RES;      gtimer.mdmFSMTimerout = 0;            break;    case MDM_WAIT1_ATGSN_RES:/*读取IMEI*/      if(!mdm_check_str((u8*)"OK")) /*查询到OK*/      {        Str2BCD(USART1_RX_BUF, (u8*)temp1IMEI);        MDM_STA = MDM_TX2_ATGSN_CMD; /*第2次读取IMEI*/        LOG("-1-get IMEI ok\r\n");      }      else if(gtimer.mdmFSMTimerout > 400) /*2s超时*/      {        MDM_STA = MDM_TX_ATCIMI_CMD;        LOG("-1-get IMEI error\r\n");      }            break;            /*第2次读取IMEI*/    case MDM_TX2_ATGSN_CMD:       LOG("\r\n*Step:%d,read IMEI\r\n", MDM_TX2_ATGSN_CMD);      mdm_send_cmd_noack((u8*)"AT+GSN"); /*读取IMEI*/      MDM_STA = MDM_WAIT2_ATGSN_RES;      gtimer.mdmFSMTimerout = 0;            break;    case MDM_WAIT2_ATGSN_RES:/*读取IMEI*/      if(!mdm_check_str((u8*)"OK")) /*查询到OK*/      {        Str2BCD(USART1_RX_BUF, (u8*)temp2IMEI);         MDM_STA = MDM_TX_ATCIMI_CMD;        LOG("-2-get IMEI ok\r\n");        if(memcmp(&temp1IMEI[0], &temp2IMEI[0], sizeof(temp2IMEI)) == 0) /*两次结果相等*/        {          LOG("read 2 times same IMEI\r\n");          LOG("IMEI1:\r\n");          printfHex(temp1IMEI,sizeof(temp1IMEI));          LOG("IMEI2:\r\n");          printfHex(temp2IMEI,sizeof(temp2IMEI));          if(memcmp(&deviceInfo.deviceIMEI[0], &temp2IMEI[0], sizeof(temp2IMEI)) != 0)/*和旧IMEI比较*/          {            memcpy(&deviceInfo.deviceIMEI[0], &temp2IMEI[0], sizeof(temp2IMEI));            writeFlash();              //保存参数            LOG("updata IMEI ok\r\n");          }          else          {            LOG("old IMEI ok\r\n");          }                      memset(temp1IMEI, 0x00, sizeof(temp1IMEI));          memset(temp2IMEI, 0x00, sizeof(temp2IMEI));                            }        else        {          LOG("read 2 times different IMEI\r\n");        }        }      else if(gtimer.mdmFSMTimerout > 400) /*2s超时*/      {        MDM_STA = MDM_TX_ATCIMI_CMD;        LOG("-2-get IMEI error\r\n");      }            break;          /*读取IMSI*/      case MDM_TX_ATCIMI_CMD: /*读取IMSI*/      LOG("\r\n*Step:%d,read IMSI\r\n", MDM_TX_ATCIMI_CMD);      mdm_send_cmd_noack((u8*)"AT+CIMI");       MDM_STA = MDM_WAIT_ATCIMI_RES;      gtimer.mdmFSMTimerout = 0;              break;    case MDM_WAIT_ATCIMI_RES:      if(!mdm_check_str((u8*)"OK")) /*查询到OK*/      {        char tmpIMSI[8];        Str2BCD(USART1_RX_BUF, (u8*)tmpIMSI); /*TBoxInfoType.deviceInfo.deviceIMSI*/        MDM_STA = MDM_GPRS_INTI;        LOG("get IMSI:\r\n");        printfHex(tmpIMSI,sizeof(tmpIMSI));        if(memcmp(&TBoxInfoType.deviceInfo.deviceIMSI[0], &tmpIMSI[0], sizeof(tmpIMSI)) != 0)/*和旧数据比较*/        {          memcpy(&TBoxInfoType.deviceInfo.deviceIMSI[0], &tmpIMSI[0], sizeof(tmpIMSI));          writeFlash(); //保存参数          LOG("updata IMSI ok\r\n");        }        else        {          LOG("old IMSI ok\r\n");        }        memset(tmpIMSI, 0x00, sizeof(tmpIMSI));      }      else if(gtimer.mdmFSMTimerout > 400) /*2s超时*/      {        MDM_STA = MDM_GPRS_INTI;        LOG("get IMSI error\r\n");      }            break;                        /*GPRS配置*/    case MDM_GPRS_INTI:      LOG("\r\n*Step:%d,MDM_GPRS_INTI\r\n", MDM_GPRS_INTI);      MDM_STA = MDM_TX_ATE_CMD;      break;        case MDM_TX_ATE_CMD:/*开关回显*/      LOG("\r\n*Step:%d,%s\r\n", MDM_TX_ATE_CMD, ATEx);      mdm_send_cmd_noack((u8*)ATEx); /*开关回显*/      MDM_STA = MDM_WAIT_ATE_RES;      gtimer.mdmFSMTimerout = 0;            break;    case MDM_WAIT_ATE_RES:      if(!mdm_check_str((u8*)"OK"))       {        MDM_STA = MDM_TX_ATCPIN_CMD;        LOG("%s ok\r\n", ATEx);      }      else if(gtimer.mdmFSMTimerout > 200) /*1s超时*/      {        MDM_STA = MDM_TX_ATCPIN_CMD;        LOG("ATEx error\r\n");      }            break;                      case MDM_TX_ATCPIN_CMD: /*非阻塞式,最大等待时长5s*/      LOG("\r\n*Step:%d,AT+CPIN?\r\n", MDM_TX_ATCPIN_CMD);      mdm_send_cmd_noack((u8*)"AT+CPIN?");      MDM_STA = MDM_WAIT_ATCPIN_RES;      gtimer.mdmFSMTimerout = 0;            break;    case MDM_WAIT_ATCPIN_RES:      if(!mdm_check_str((u8*)"READY")) /*查询*/      {        MDM_STA = MDM_TX_ATCCID_CMD;        LOG("AT+CPIN? ok\r\n");      }      else if(gtimer.mdmFSMTimerout > WAIT_ATCPIN_MAX_TIME) /*超时,最大5s*/      {        MDM_STA = MDM_TX_ATCCID_CMD; /*next*/        gCnt.mdmTotalErr++;        SIM_Handler();/*SIM卡故障*/        LOG("AT+CPIN? error\r\n");      }            break;          case MDM_TX_ATCCID_CMD: /*查询SIM卡CCID*/      LOG("\r\n*Step:%d,read CCID\r\n", MDM_TX_ATCCID_CMD);      mdm_send_cmd_noack((u8*)"AT+CCID");      MDM_STA = MDM_WAIT_ATCCID_RES;      gtimer.mdmFSMTimerout = 0;                  break;      case MDM_WAIT_ATCCID_RES:    if(!mdm_check_str((u8*)"+CCID:")) /*查询*/    {      char* tempCCID = NULL;      u8 ccidSize = 21;            tempCCID = (char*)malloc(sizeof(char)*ccidSize);              memset(tempCCID, 0x00, ccidSize);       memcpy(tempCCID, &USART1_RX_BUF[10], ccidSize);//保存CCID      tempCCID[20] = '\0'; /*添加结束符*/              LOG("tmpCCID:%s\r\n", tempCCID);        if(strstr((const char*)tempCCID, (const char*)"OK")== NULL) //无OK      {        if(strstr((const char*)tempCCID, (const char*)"\r\n")== NULL) //无回车换行                {          memcpy(m6313Debug.ccid, tempCCID, ccidSize);//更新CCID          m6313Debug.ccid[20] = '\0'; /*添加结束符*/          LOG("newCCID:%s\r\n", m6313Debug.ccid);          }        else        {          LOG("error\"OK\",");          LOG("old CCID:%s\r\n", m6313Debug.ccid);                  }      }      else      {        LOG("error\"0x0A,0x0D\"\r\n");        LOG("old CCID:%s\r\n", m6313Debug.ccid);                }              free(tempCCID);            MDM_STA = MDM_TX_ATCREG_CMD;                      }    else if(gtimer.mdmFSMTimerout > WAIT_ATCCID_MAX_TIME) /*超时,5s*/    {      MDM_STA = MDM_TX_ATCREG_CMD;      LOG("CCID get timeout! ");      LOG("old CCID:%s\r\n", m6313Debug.ccid);    }            break;    case MDM_TX_ATCREG_CMD: /*查询2G网络是否注册*/      LOG("\r\n*Step:%d,AT+CREG?\r\n", MDM_TX_ATCREG_CMD);      mdm_send_cmd_noack((u8*)"AT+CREG?");      MDM_STA = MDM_WAIT_ATCREG_RES;      gtimer.mdmFSMTimerout = 0;            break;    case MDM_WAIT_ATCREG_RES:      if(!mdm_check_str((u8*)",1")) /*查询,已注册*/      {            MDM_STA = MDM_TX_ATCSQ_CMD;        LOG("AT+CREG? ok:1\r\n");      }      else if(!mdm_check_str((u8*)",5")) /*查询,漫游*/      {            MDM_STA = MDM_TX_ATCSQ_CMD;        LOG("AT+CREG? ok:5\r\n");      }      else if(gtimer.mdmFSMTimerout > WAIT_ATCREG_MAX_TIME) /*超时,3s*/      {        USART1_RX_STA=0;        MDM_STA = MDM_TX_ATCSQ_CMD; /*进入下一步*/        LOG("AT+CREG? error\r\n");      }            break;                  case MDM_TX_ATCSQ_CMD: /*查询当前信号质量*/      LOG("\r\n*Step:%d,AT+CSQ\r\n", MDM_TX_ATCSQ_CMD);      mdm_send_cmd_noack((u8*)"AT+CSQ");      MDM_STA = MDM_WAIT_ATCSQ_RES;      gtimer.mdmFSMTimerout = 0;              break;    case MDM_WAIT_ATCSQ_RES:      if(!mdm_check_str((u8*)"OK")) /*查询*/      {        u8 len;        mdmInfo.signalIntensity = NMEA_Str2num(&USART1_RX_BUF[8],&len); /*得到MDM的CSQ*/                ​​        MDM_STA = MDM_TX_ATQICLOSE_CMD;        LOG("MDM_CSQ=%d\r\n", mdmInfo.signalIntensity);      }      else if(gtimer.mdmFSMTimerout > 200) /*1s超时*/      {​        MDM_STA = MDM_TX_ATQICLOSE_CMD;        LOG("get CSQ error.\r\n");      }        break;            /*AT+QICLOSE关闭TCPUDP连接*/              case MDM_TX_ATQICLOSE_CMD: /*关闭PDP使用场景*/      LOG("\r\n*Step:%d,AT+QICLOSE\r\n", MDM_TX_ATQICLOSE_CMD);      mdm_send_cmd_noack((u8*)"AT+QICLOSE");      MDM_STA = MDM_WAIT_ATQICLOSE_RES;      gtimer.mdmFSMTimerout = 0;            break;    case MDM_WAIT_ATQICLOSE_RES:      if(!mdm_check_str((u8*)"ERROR")) /*关闭连接失败*/      {                         MDM_STA = MDM_TX_ATQIDEACT_CMD; /*NEXT关闭PDP*/        LOG("AT+QICLOSE ok:\"ERROR\"\r\n");      }      else if(!mdm_check_str((u8*)"CLOSE OK")) /*关闭连接成功*/      {                       MDM_STA = MDM_TX_ATQIDEACT_CMD; /*NEXT关闭PDP*/        LOG("AT+QICLOSE ok:\"CLOSE OK\"\r\n");      }      else if(gtimer.mdmFSMTimerout > WAIT_ATQICLOSE_MAX_TIME) /*超时,最大2s*/      {        MDM_STA = MDM_TX_ATQIDEACT_CMD;  /*NEXT关闭PDP*/        LOG("AT+QICLOSE error\r\n");      }            break;          /*AT+QIDEACT关闭PDP使用场景*/    case MDM_TX_ATQIDEACT_CMD:       LOG("\r\n*Step:%d,AT+QIDEACT\r\n", MDM_TX_ATQIDEACT_CMD);      mdm_send_cmd_noack((u8*)"AT+QIDEACT");      MDM_STA = MDM_WAIT_ATQIDEACT_RES;      gtimer.mdmFSMTimerout = 0;            break;    case MDM_WAIT_ATQIDEACT_RES:      if(!mdm_check_str((u8*)"ERROR")) /*查询*/      {                         MDM_STA = MDM_TX_ATQIREGAPP_CMD;        LOG("AT+QIDEACT ok:\"ERROR\"\r\n");      }      else if(!mdm_check_str((u8*)"DEACT OK")) /*查询*/      {                       MDM_STA = MDM_TX_ATQIREGAPP_CMD;        LOG("AT+QIDEACT ok:\"DEACT OK\"\r\n");      }      else if(gtimer.mdmFSMTimerout > WAIT_ATQIDEACT_MAX_TIME) /*超时,最大45s*/      {        MDM_STA = MDM_TX_ATQIREGAPP_CMD;         LOG("AT+QIDEACT error\r\n");      }            break;                case MDM_TX_ATQIREGAPP_CMD: /*设置GPRS的APN（配置为 SIM卡签约对应的APN）*/      LOG("\r\n*Step:%d,AT+QIREGAPP\r\n", MDM_TX_ATQIREGAPP_CMD);      mdm_send_cmd_noack((u8*)"AT+QIREGAPP=\"CMNET\"");      MDM_STA = MDM_WAIT_ATQIREGAPP_RES;      gtimer.mdmFSMTimerout = 0;            break;          case MDM_WAIT_ATQIREGAPP_RES:      if(!mdm_check_str((u8*)"OK")) /*查询*/      {                      MDM_STA = MDM_START_ATQIACT_CMD;        LOG("AT+QIREGAPP ok\r\n");      }      else if(gtimer.mdmFSMTimerout > WAIT_ATQIREGAPP_MAX_TIME) /*超时,3s*/      {        MDM_STA = MDM_START_ATQIACT_CMD; /*NEXT*/        LOG("AT+QIREGAPP error\r\n");      }            break;​    case MDM_START_ATQIACT_CMD: /*开始激活PDP*/      LOG("\r\n*Step:%d,MDM_START_ATQIACT_CMD\r\n", MDM_START_ATQIACT_CMD);      iTimes = 0;      MDM_STA = MDM_TX_ATQIACT_CMD;      break;      case MDM_TX_ATQIACT_CMD: /*激活PDP,GPRS网络*/      LOG("\r\n*step:%d,AT+QIACT\r\n", MDM_TX_ATQIACT_CMD);      mdm_send_cmd_noack((u8*)"AT+QIACT");      iTimes++;      LOG("AT+QIACT,count-%d-!\r\n", iTimes);      gtimer.mdmFSMTimerout = 0;      MDM_STA = MDM_WAIT_ATQIACT_RES;            break;      case MDM_WAIT_ATQIACT_RES:      if(!mdm_check_str((u8*)"OK")) /*查询到OK*/      {                MDM_STA = MDM_START_TCP_SETUP;          LOG("AT+QIACT-OK[%d]\r\n", iTimes);              }      else if(gtimer.mdmFSMTimerout > WAIT_ATQIACT_MAX_TIME) /*10秒超时*/      {        if(iTimes < EXE_ATQIACT_TIMES)         {          MDM_STA = MDM_TX_ATQIACT_CMD; /*继续激活PDP*/          LOG(".AT+QIACT,Continue-%d-!\r\n", iTimes);        }        else /*iTimes超过次数*/        {           iTimes = 0;                    MDM_STA = MDM_START_TCP_SETUP; /*NEXT*/            LOG("AT+QIACT,%d times PDP active error\r\n", EXE_ATQIACT_TIMES);                  }      }            break;                  /*建立TCP连接*/      case MDM_START_TCP_SETUP:      LOG("\r\n*Step:%d,MDM_START_TCP_SETUP\r\n", MDM_START_TCP_SETUP);      MDM_STA = MDM_TX_ATQIMUX_CMD;      break;            case MDM_TX_ATQIMUX_CMD: /*配置单路连接*/      LOG("\r\n*Step:%d,AT+QIMUX\r\n", MDM_TX_ATQIMUX_CMD);      mdm_send_cmd_noack((u8*)"AT+QIMUX=0");      MDM_STA = MDM_WAIT_ATQIMUX_RES;      gtimer.mdmFSMTimerout = 0;              break;    case MDM_WAIT_ATQIMUX_RES:      if(!mdm_check_str((u8*)"OK")) /*查询*/      {                      MDM_STA = MDM_TX_ATQIMODE_CMD;        LOG("AT+QIMUX ok\r\n");      }      else if(gtimer.mdmFSMTimerout > 200) /*超时,1s*/      {        MDM_STA = MDM_TX_ATQIMODE_CMD; /*NEXT*/        LOG("AT+QIMUX error\r\n");      }              break;                  case MDM_TX_ATQIMODE_CMD: /*配置非透传模式*/      LOG("\r\n*Step:%d,AT+QIMODE\r\n", MDM_TX_ATQIMODE_CMD);      mdm_send_cmd_noack((u8*)"AT+QIMODE=0"); /*非透传*/      MDM_STA = MDM_WAIT_ATQIMODE_RES;      gtimer.mdmFSMTimerout = 0;              break;    case MDM_WAIT_ATQIMODE_RES:      if(!mdm_check_str((u8*)"OK")) /*查询*/      {                      MDM_STA = MDM_TX_ATQIDNSIP_CMD;        LOG("AT+QIMODE ok\r\n");      }      else if(gtimer.mdmFSMTimerout > 200) /*超时,1s*/      {        MDM_STA = MDM_TX_ATQIDNSIP_CMD; /*NEXT*/            LOG("AT+QIMODE error\r\n");      }              break;                  case MDM_TX_ATQIDNSIP_CMD: /*使用域名访问*/       LOG("\r\n*Step:%d,AT+QIDNSIP\r\n", MDM_TX_ATQIDNSIP_CMD);      mdm_send_cmd_noack((u8*)"AT+QIDNSIP=1"); /*非透传*/      MDM_STA = MDM_WAIT_ATQIDNSIP_RES;      gtimer.mdmFSMTimerout = 0;            break;    case MDM_WAIT_ATQIDNSIP_RES:            if(!mdm_check_str((u8*)"OK")) /*查询*/      {                      MDM_STA = MDM_START_ATQIOPEN_CMD; /*NEXT*/        LOG("AT+QIDNSIP ok\r\n");       }      else if(gtimer.mdmFSMTimerout > 400) /*超时2s*/      {        MDM_STA = MDM_START_ATQIOPEN_CMD; /*NEXT*/              LOG("AT+QIDNSIP error\r\n");      }        break;                case MDM_START_ATQIOPEN_CMD: /*开始TCP连接*/      LOG("\r\n*Step:%d,MDM_START_ATQIOPEN_CMD\r\n", MDM_START_ATQIOPEN_CMD);      iTimes = 0;      MDM_STA = MDM_TX_ATQIOPEN_CMD;      break;    case MDM_TX_ATQIOPEN_CMD:      LOG("\r\n*Step:%d,AT+QIOPEN\r\n", MDM_TX_ATQIOPEN_CMD);        if(devParam.secondTcp.addr[0] !=0)/*联网IP选择*/      {         TCP_Conncect(devParam.secondTcp.addr,devParam.secondTcp.port);      }      else{        TCP_Conncect(IPaddr,IPport);}​      iTimes++;      LOG("send\"AT+QIOPEN\",count-%d-\r\n", iTimes);          MDM_STA = MDM_WAIT_ATQIOPEN_RES;      gtimer.mdmFSMTimerout = 0;            break;        case MDM_WAIT_ATQIOPEN_RES:      if(!mdm_check_str((u8*)"CONNECT OK")) /*查询CONNECT*/      {                      MDM_STA = MDM_WAIT_TCPSEND_CMD; /*TCP建立成功,进入空闲状态*/        LOG(".get\"CONNECT OK\"\r\n");              }      else if(!mdm_check_str((u8*)"ALREAY CONNECT"))      {        MDM_STA = MDM_WAIT_TCPSEND_CMD; /*TCP建立成功,进入空闲状态*/        LOG(".get\"ALREAY CONNECT\"\r\n");              }      else if(gtimer.mdmFSMTimerout > WAIT_ATQIOPEN_MAX_TIME) /*超时,30s*/      {            LOG("count-%d-,MDM_FSM timeout!\r\n", iTimes);                if(iTimes < EXE_ATQIOPEN_TIMES)         {          MDM_STA = MDM_TX_ATQIOPEN_CMD; /*继续建立TCP*/          LOG(".continue AT+QIOPEN!\r\n");        }        else /*iTimes超过次数*/        {           iTimes = 0;                              MDM_STA = MDM_IDLE_STA; /*中断*/                  STOP_MDM_FSM(); /*MDM_FSM结束*/               cntMdm = 0; /*MDM连网失败*/          gCnt.mdmTotalErr++; //MDM错误统计          LOG("AT+QIOPEN:%d times exe error,TCP connect fail!\r\n",EXE_ATQIOPEN_TIMES);                  }              }            break;      /*进行延时发送任务*/    case MDM_WAIT_TCPSEND_CMD:      MDM_STA = MDM_WAIT_TCPSEND_RES; /*TCP建立成功,进入等待发送任务*/      LOG("MDM_FSM:TCP connect suc!\r\n");      gtimer.mdmFSMTimerout = 0;            break;          case MDM_WAIT_TCPSEND_RES:      if(gtimer.mdmFSMTimerout > 400)  /*等待两秒*/      {                MDM_STA = MDM_IDLE_STA; /*TCP建立成功,进入空闲状态*/        MDM_NET_CONNECT_OK_HANDLE();        STOP_MDM_FSM(); /*MDM_FSM结束*/          }              break;  ​    default:      break;  }}

 

 

 

 这就是我分享的2G网络模块联网的过程哈，里面代码是实践过的，如果大家有什么更好的思路，欢迎分享交流哈。