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 >[,<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。
