大流量卡网-联通电信移动广电大流量卡推荐手机卡电销卡办理找实惠流量卡从这里开始
大流量卡网-联通电信移动广电大流量卡推荐手机卡电销卡办理找实惠流量卡从这里开始
大流量卡网-联通电信移动广电大流量卡推荐手机卡电销卡办理找实惠流量卡从这里开始

一文教会你嵌入式网络模块的联网操作

作者:良知犹存

转载授权以及围观:欢迎添加微信公众号:Conscience_Remains

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 >[,<keepidle>][,<keepinterval>][,< 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。

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