下一篇文章里我們通過交叉編譯生成了?libmosquitto.so.1?

參看：MQTT再學習 -- 交叉編譯與移植

之前有講過MQTT客戶端的測試，參看：MQTT再學習 -- 安裝MQTT客戶端及測試

那接下來，我們就開始先測試一下，看看交叉編譯生成的客戶端，是否能發送數據到服務器上。

一、生成交叉編譯客戶端

先看一下，需要的源碼文件，這個在客戶端測試那篇文章里有提供源碼的哦。 # ls a.txt deviceCfg.xml libmosquitto.so.1 mosq.c mosquitto.h net_zslf.c net_zslf.h readme.txt 交叉編譯，生成目標文件。
arm-none-linux-gnueabi-gcc -c net_zslf.c mosq.c?
鏈接共享庫： arm-none-linux-gnueabi-gcc mosq.o net_zslf.o -L . libmosquitto.so.1 /opt/com/ssl/lib/libssl.so.1.0.0 /opt/com/ssl/lib/libcrypto.so.1.0.0 -o client
生成可執行文件 client //查看文件屬性 # file client client: ELF 32-bit LSB executable, ARM, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.14, not stripped//Ubuntu下 不能執行 # ./client bash: ./client: cannot execute binary file

注意： ?這個必須要鏈接 libssl.so.1.0.0 libcrypto.so.1.0.0，否則出現錯誤：

/opt/arm-2009q1-203/bin/../lib/gcc/arm-none-linux-gnueabi/4.3.3/../../../../arm-none-linux-gnueabi/bin/ld: cannot find -lmosquitto
collect2: ld returned 1 exit status

這部分參看文章：

mosquitto的交叉編譯mips

mqtt的開源實現mosquitto的交叉編譯與使用?

嘗試了一上午終于找到原因不容易啊。至此生成了Linux下可執行的客戶端的二進制文件 client

二、在開發板上執行客戶端測試

將這三個庫文件 libcrypto.so.1.0.0 libmosquitto.so.1 libssl.so.1.0.0 ?拷貝到開發板 lib 目錄下

然后拷貝 client 和?deviceCfg.xml 放在同一目錄

執行client 之前需要修改權限：chmod 777 client?

Ubuntu下 打開 MQTT 服務器

開發板下 執行 client

?

OK，終于完成了！！！

證明交叉編譯生成的客戶端測試代碼是可行的。

三、客戶單測試源碼下載

下載：交叉編譯 MQTT 客戶端測試源碼

四、結合MQTT和PMS7003開發程序

這才是本篇文章的核心，也是本項目最后的一步了。

參看：PM2.5檢測 -- PMS7003 開發程序 #include <fcntl.h> //文件控制定義 #include <stdio.h> //標準輸入輸出定義 #include <stdlib.h> //標準函數庫定義 #include <unistd.h> //Unix標準函數定義 #include <errno.h> //錯誤好定義 #include <termios.h> //POSIX終端控制定義 #include <sys/ioctl.h> //ioctl函數定義 #include <string.h> //字符操作 #include <sys/types.h> #include <sys/stat.h> #include <pthread.h> #include <sys/time.h> #include <sys/msg.h> #include <stdint.h> #include <stdbool.h> #include <pthread.h> #include "mosquitto.h" #include "net_zslf.h" #include <sys/wait.h> //message queue variable int message_count = 0; //const char *mqtt_broker_address = "192.168.2.52"; /* mqtt_broker ip address */ int mqtt_broker_port = 1883; /* mqtt_broker port number */ long msgtype = 10; /* pm sensor message type */ //int msgsize = 100; /* pm sensor message size */ int msgsize = sizeof (MSG_data_buf); /* pm sensor message size */ int fd_gpio; struct termios newtio, oldtio; typedef struct { int pin_idx; int pin_dir; int pin_sta; } davinci_gio_arg; typedef enum { AT91PIO_DIR_OUT = 0, AT91PIO_DIR_INP } davinci_gio_dir; //驅動判斷輸入輸出模式 davinci_gio_arg arg; #define DEV_PIO_LED "/dev/pio" // 需要手動添加設備號 mknod /dev/pio c 203 0 #define PIO_NUM 47 // 47pin 為控制輸入輸出方向引腳 #define DEV_UART "/dev/ttyS1" // /dev/ttyS1 為串口設備 #define IOCTL_PIO_SETDIR 1 //set gpio direct #define IOCTL_PIO_GETDIR 2 //get gpio direct #define IOCTL_PIO_SETSTA 3 //set gpio status #define IOCTL_PIO_GETSTA 4 //get gpio status //保存信息 int log_init( const char *strFileName ) { int fdLog = -1; if( -1 == (fdLog = open( strFileName, O_CREAT|O_TRUNC ) ) ) { } close( fdLog ); } int log_out( const char *strFileName, const char * szLog ) { int fdLog = -1; if( -1 == ( fdLog = open( strFileName, O_CREAT|O_WRONLY|O_APPEND ) ) ) { printf( "LOG (%s) open error!\n", strFileName ); return -1; } write( fdLog, szLog, strlen( szLog ) ); close( fdLog ); return 0; } //配置串口 /* 參數說明：fd 設備文件描述符，nspeed 波特率，nbits 數據位數（7位或8位）， parity 奇偶校驗位（'n'或'N'為無校驗位，'o'或'O'為偶校驗，'e'或'E'奇校驗）， nstop 停止位（1位或2位） 成功返回1，失敗返回-1。 */ int set_com_opt( int fd, int nspeed, int nbits, char parity, int nstop ) { char szTmp[128]; //打印配置信息 sprintf( szTmp, "set_com_opt - speed:%d,bits:%d,parity:%c,stop:%d\n", nspeed, nbits, parity, nstop ); log_out( "./485.log", szTmp ); //保存并測試現在有串口參數設置，在這里如果串口號等出錯，會有相關的出錯信息 if( tcgetattr( fd, &oldtio ) != 0 ) { sprintf( szTmp, "SetupSerial 1" ); log_out( "./485.log", szTmp ); perror( "SetupSerial 1" ); return -1; } //修改輸出模式，原始數據輸出 bzero( &newtio, sizeof( newtio )); newtio.c_cflag &=~(OPOST); //屏蔽其他標志位 newtio.c_cflag |= (CLOCAL | CREAD ); newtio.c_cflag &= ~CSIZE; //設置數據位 switch( nbits ) { case 7: newtio.c_cflag |= CS7; break; case 8: newtio.c_cflag |= CS8; break; default: perror("Unsupported date bit!\n"); return -1; } //設置校驗位 switch( parity ) { case 'n': case 'N': //無奇偶校驗位 newtio.c_cflag &= ~PARENB; newtio.c_iflag &= ~INPCK; break; case 'o': case 'O': //設置為奇校驗 newtio.c_cflag |= ( PARODD | PARENB ); newtio.c_iflag |= ( INPCK | ISTRIP ); break; case 'e': case 'E': //設置為偶校驗 newtio.c_iflag |= ( INPCK |ISTRIP ); newtio.c_cflag |= PARENB; newtio.c_cflag &= ~PARODD; break; default: perror("unsupported parity\n"); return -1; } //設置停止位 switch( nstop ) { case 1: newtio.c_cflag &= ~CSTOPB; break; case 2: newtio.c_cflag |= CSTOPB; break; default : perror("Unsupported stop bit\n"); return -1; } //設置波特率 switch( nspeed ) { case 2400: cfsetispeed( &newtio, B2400 ); cfsetospeed( &newtio, B2400 ); break; case 4800: cfsetispeed( &newtio, B4800 ); cfsetospeed( &newtio, B4800 ); break; case 9600: cfsetispeed( &newtio, B9600 ); cfsetospeed( &newtio, B9600 ); break; case 115200: cfsetispeed( &newtio, B115200 ); cfsetospeed( &newtio, B115200 ); break; case 460800: cfsetispeed( &newtio, B460800 ); cfsetospeed( &newtio, B460800 ); break; default: cfsetispeed( &newtio, B9600 ); cfsetospeed( &newtio, B9600 ); break; } //設置等待時間和最小接收字符 newtio.c_cc[VTIME] = 0; newtio.c_cc[VMIN] = 0; //VTIME=0，VMIN=0，不管能否讀取到數據，read都會立即返回。 //輸入模式 newtio.c_lflag &= ~(ICANON|ECHO|ECHOE|ISIG); //設置數據流控制 newtio.c_iflag &= ~(IXON|IXOFF|IXANY); //使用軟件流控制 //如果發生數據溢出，接收數據，但是不再讀取 刷新收到的數據但是不讀 tcflush( fd, TCIFLUSH ); //激活配置 (將修改后的termios數據設置到串口中） if( tcsetattr( fd, TCSANOW, &newtio ) != 0 ) { sprintf( szTmp, "serial set error!\n" ); log_out( "./485.log", szTmp ); perror( "serial set error!" ); return -1; } log_out( "./485.log", "serial set ok!\n" ); return 1; } //打開串口并返回串口設備文件描述 int open_com_dev( char *dev_name ) { int fd; char szTmp[128]; log_init( "./485.log" ); if(( fd = open( dev_name, O_RDWR|O_NOCTTY|O_NDELAY)) == -1 ) { perror("open\n"); //printf("Can't open Serial %s Port!\n", dev_name ); sprintf( szTmp, "Can't open Serial %s Port!\n", dev_name ); log_out( "./485.log", szTmp ); return -1; } sprintf( szTmp, "open %s ok!\n", dev_name ); log_out( "./485.log", szTmp ); if(fcntl(fd,F_SETFL,0)<0) { printf("fcntl failed!\n"); } //printf("Open %s ok\n",dev_name ); return fd; } int main (void) { int gflags; int msgid; key_t key; pthread_t thread1, thread2; int ret; /* struct msqid_ds msg_ginfo, msg_sinfo; */ char *msgpath = "home/tarena/project/MQTT/test/a.txt"; //消息隊列的 鍵 key = ftok(msgpath, 'a'); gflags = IPC_CREAT; //創建消息隊列 msgid = msgget(key, gflags | 00666); if(msgid == -1) { DUG_PRINTF("msg create error\n"); return -1; } int error = 0, error1 = 0; arg.pin_idx = PIO_NUM; arg.pin_dir = AT91PIO_DIR_OUT; //打開/dev/pio設備 fd_gpio = open(DEV_PIO_LED, O_RDWR); if(fd_gpio < 0) { perror("fd_gpio open err"); exit (-1); } /* msg_stat(msgid,msg_ginfo); */ //創建消息隊列發送線程 ret = pthread_create(&thread1, NULL, &start_thread_msgsend, (void *)&msgid); if (ret != 0) { perror("pthread msgsend create error\n"); return -1; } //創建消息隊列接收線程 ret = pthread_create(&thread2, NULL, &start_thread_msgrcv, (void *)&msgid); if (ret != 0){ perror("pthread msgrcv create error\n"); return -1; } //線程等待 pthread_join(thread1, NULL); pthread_join(thread2, NULL); //關閉設備 close (fd_gpio); return 0; } //消息隊列接收線程 void *start_thread_msgrcv(void *arg) { int rflags = 0; int ret; int msgid = *(int *)(arg); MSG_data_buf msg_rbuf; //消息隊列類型 struct mosquitto *mosq; //保存一個MQTT客戶端連接的所有信息 //下面的代碼是從xml文件中讀取 FILE *fp; char szFileBuff[1024] = {0}; char serverADDR[16] = {0},devID[15] = {0},devName[15] = {0}; char Longitude[15] = {0},Latitude[15] = {0},frequency[3] = {0}; char *lFirst, *lEnd; char devInfo[70]; FILE *fp_re; char buffer_re[4]; //打開xml文件 fp = fopen("deviceCfg.xml","r"); if (fp==NULL) { DUG_PRINTF("read XML file error!\n"); } //你只要知道while里面是獲取xml信息的，至于這種操作有點6 while(fgets(szFileBuff, 1023, fp)) { if ((lFirst = strstr(szFileBuff, "<serverADDR>")) != NULL) { lEnd = strstr(lFirst + 1, "</serverADDR>"); memcpy(serverADDR, lFirst + 12, lEnd - lFirst - 12); } if ((lFirst = strstr(szFileBuff, "<devID>")) != NULL) { lEnd = strstr(lFirst + 1, "</devID>"); memcpy(devID, lFirst + 7, lEnd - lFirst - 7); } if ((lFirst = strstr(szFileBuff, "<devName>")) != NULL) { lEnd = strstr(lFirst + 1, "</devName>"); memcpy(devName, lFirst + 9, lEnd - lFirst - 9); } if ((lFirst = strstr(szFileBuff, "<Longitude>")) != NULL) { lEnd = strstr(lFirst + 1, "</Longitude>"); memcpy(Longitude, lFirst + 11, lEnd - lFirst - 11); } if ((lFirst = strstr(szFileBuff, "<Latitude>")) != NULL) { lEnd = strstr(lFirst + 1, "</Latitude>"); memcpy(Latitude, lFirst + 10, lEnd - lFirst - 10); } //下面這個語句是用于分頻率傳送數據的 if ((lFirst = strstr(szFileBuff, "<frequency>")) != NULL) { lEnd = strstr(lFirst + 1, "</frequency>"); memcpy(frequency, lFirst + 11, lEnd - lFirst - 11); } if ((lFirst = strstr(szFileBuff, "</display>")) != NULL) { sprintf(devInfo, "&%s&%s&%s&%s&\n",devID,devName,Longitude,Latitude); } } fclose(fp); // sleep(18); //這里是關鍵了，MQTT協議 要上演了 這部分為 pub 發布內容 //MQTT 庫初始化 mosquitto_lib_init(); //新建 mosq = mosquitto_new(devID, true, NULL); //連接回調設置 mosquitto_connect_callback_set(mosq, my_connect_callback); //斷開回調設置 mosquitto_disconnect_callback_set(mosq, my_disconnect_callback); //發布回調設置 mosquitto_publish_callback_set(mosq, my_publish_callback); //MQTT連接 if(mosquitto_connect(mosq, serverADDR, mqtt_broker_port, 600) != MOSQ_ERR_SUCCESS) { DUG_PRINTF("mosquitto connection error\n"); //銷毀 mosquitto_destroy(mosq); //清空 mosquitto_lib_cleanup(); } // sleep(18); //這里開始 消息隊列接收消息 while (1) { //接收消息 ret=msgrcv(msgid, &msg_rbuf, msgsize, msgtype, rflags); //sleep(1); if (ret == -1) { DUG_PRINTF("read msg error\n"); } DUG_PRINTF("%s\n", msg_rbuf.mtext); <span style="white-space:pre"> </span>//strcat(msg_rbuf.mtext,devInfo); 將其和其他信息合并 //將接收到的信息發布 mosquitto_publish(mosq, NULL, "pmsensor", ret, (void *)msg_rbuf.mtext, 0, 0); //sleep(5); <span style="white-space:pre"> </span>memset (msg_rbuf.mtext, 0, sizeof (msg_rbuf.mtext)); } /* should never run below */ //銷毀 mosquitto_destroy(mosq); //清空 mosquitto_lib_cleanup(); return NULL; } //單片機數據收發 void* start_thread_msgsend(void* p) { char buf[64]; char frameBuf[64]; int detectOff = 0; int res = 0, nread = 0; int m_pm1_factory; int m_pm25_factory; int m_pm10_factory; int m_pm1_outdoor; int m_pm25_outdoor; int m_pm10_outdoor; int m_count03; int m_count05; int m_count1; int m_count25; int m_count5; int m_count10; unsigned short m_length; unsigned short m_version; unsigned short m_errorno; char pm_f[30]; int retval; MSG_data_buf msg_sbuf; //消息隊列類型 int msgid = *(int *)(p); int sflags=IPC_NOWAIT; msg_sbuf.mtype = msgtype; while (1) { arg.pin_sta = 0; //設為低電平 接收態 ioctl(fd_gpio, IOCTL_PIO_SETSTA, &arg); int fd_r=open_com_dev( DEV_UART ); if( fd_r < 0 ) { printf( "open UART device error! %s\n", DEV_UART ); } else set_com_opt(fd_r, 9600,8,'n',1); //執行select fd_set rd; FD_ZERO(&rd); FD_SET(fd_r, &rd); if ((res = select (fd_r+1,&rd, NULL, NULL, NULL) )< 0) { perror ("read err"); exit (-1); } memset (buf, 0, sizeof (buf)); if (FD_ISSET (fd_r, &rd)) { //接收數據 8 8 2 int res1 = 0; int val = 0; int calcChecksum = 0; int checksum = 0; int i = 0; while ((nread = read(fd_r, buf, 1)) > 0) { //printf ("%02X ",*buf); //frameBuf[detectOff] = buf[0]; memcpy (frameBuf+detectOff, buf, 1); //calcChecksum += *buf; detectOff++; if (frameBuf[0] == 0x42 && frameBuf[1] == 0x4d) { // m_length = frameBuf[3]+(frameBuf[2]<<8); m_pm1_factory = frameBuf[5]+(frameBuf[4]<<8); m_pm25_factory = frameBuf[7]+(frameBuf[6]<<8); m_pm10_factory = frameBuf[9]+(frameBuf[8]<<8); m_pm1_outdoor = frameBuf[11]+(frameBuf[10]<<8); m_pm25_outdoor = frameBuf[13]+(frameBuf[12]<<8); m_pm10_outdoor = frameBuf[15]+(frameBuf[14]<<8); // m_count03 = frameBuf[17]+(frameBuf[16]<<8); // m_count05 = frameBuf[19]+(frameBuf[18]<<8); // m_count1 = frameBuf[21]+(frameBuf[20]<<8); // m_count25 = frameBuf[23]+(frameBuf[22]<<8); // m_count5 = frameBuf[25]+(frameBuf[24]<<8); // m_count10 = frameBuf[27]+(frameBuf[26]<<8); // m_version = frameBuf[28]; // m_errorno = frameBuf[29]; // checksum = frameBuf[31]+(frameBuf[30]<<8); // calcChecksum -= ((checksum>>8)+(checksum&0xFF)); } //退出循環， 這里有點疑問 if (detectOff == 32) { //printf ("\n"); //printf ("pm1_factory = %d ug/m3\npm25_factory = %d ug/m3\npm10_factory = %d ug/m3\n", m_pm1_factory, m_pm25_factory, m_pm10_factory); //printf ("pm1_outdoor = %d ug/m3\npm25_outdoor = %d ug/m3\npm10_outdoor = %d ug/m3\n",m_pm1_outdoor,m_pm25_outdoor,m_pm10_outdoor); // printf ("m_count03 = %02X\nm_count05 = %02X\nm_count1 = %02X\nm_count25 = %02X\nm_count5 = %02X\nm_count10 = %02X\n", // m_count03, m_count05, m_count1, m_count25, m_count5, m_count10); // printf ("m_length = %d\n", m_length); // printf ("m_version = %s\n", m_version); // printf ("m_errorno = %s\n", m_errorno); // printf("checksum = %02X %s calcChecksum = %02X",checksum, (calcChecksum == checksum ? "==" : "!="), calcChecksum); // for (i = 0;i<32;i++) // { // printf ("%02X ", frameBuf[i]); // } // printf ("\n"); sprintf(pm_f,"%d %d",m_pm25_factory,m_pm10_factory); /*這里和 下面的 read 結合 就好了 */ strcpy (msg_sbuf.mtext,pm_f); //strcpy (msg_sbuf.mtext,"hello world"); //消息隊列發送 //retval = msgsnd(msgid, &msg_sbuf,msgsize, sflags); retval = msgsnd(msgid, &msg_sbuf,msgsize, 0); if(retval == -1) { DUG_PRINTF("message send error\n"); } memset (frameBuf, 0, sizeof (frameBuf)); memset (pm_f, 0, sizeof (pm_f)); memset (msg_sbuf.mtext, 0, sizeof (msg_sbuf.mtext)); detectOff = 0; break; } } } close (fd_r); usleep (200000); } } 測試結果： Ubuntu下 打開 MQTT 服務器

開發板下 執行 client

總結

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