华为摄像头（海思3519A/3516D）编译安装：paho.mqtt.embedded-c_paho.mqtt.embedded-c-master

1、简介

介绍如何使用Paho提供的嵌入式C语言MQTT开源工程交叉编译（海思3519A/3516D），并进行消息收发测试。https://github.com/eclipse/paho.mqtt.embedded-c

2、解压sdk

unzip paho.mqtt.embedded-c-master.zip
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目录 /media/sf_share/code/mqtt 下得到解压后文件：paho.mqtt.embedded-c-master

3、建立编译目录

进入目录：/media/sf_share/code/mqtt/paho.mqtt.embedded-c-master
建立编译文件：mkdir build

4、编译执行脚本

进入目录：/media/sf_share/code/mqtt/paho.mqtt.embedded-c-master/build
建立脚本：touch cmake.sh
编辑脚本：vi cmake.sh
脚本内容：

cmake -DCMAKE_C_COMPILER=arm-himix200-linux-gcc -DCMAKE_CXX_COMPILER=arm-himix200-linux-g++ ..
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执行脚本：./cmake.sh

5、代码编辑、编译与执行

编译代码位置：/media/sf_share/code/mqtt/paho.mqtt.embedded-c-master/build
编译命令：make
重编译清除命令：rm -rf !(cmake.sh)
代码编辑位置：/media/sf_share/code/mqtt/paho.mqtt.embedded-c-master/MQTTClient/test
执行文件位置：/media/sf_share/code/mqtt/paho.mqtt.embedded-c-master/build/MQTTClient/test
注意：执行文件是只能在目标机（海思3519A/3516D）运行的文件。

6、目标机（海思3519A/3516D）运行库建立

在目录 /home/nfs 下建立文件：mkdir lib_mqtt
进入目录：/home/nfs/lib_mqtt
拷贝运行库：

cp /media/sf_share/code/mqtt/paho.mqtt.embedded-c-master/build/MQTTPacket/src/libMQTTPacketClient.so ./
cp /media/sf_share/code/mqtt/paho.mqtt.embedded-c-master/build/MQTTPacket/src/libMQTTPacketServer.so ./
cp /media/sf_share/code/mqtt/paho.mqtt.embedded-c-master/build/MQTTPacket/src/libpaho-embed-mqtt3c.so ./
cp /media/sf_share/code/mqtt/paho.mqtt.embedded-c-master/build/MQTTClient-C/src/libpaho-embed-mqtt3cc.so ./
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获得4个运行库：

libMQTTPacketClient.so  
libMQTTPacketServer.so  
libpaho-embed-mqtt3cc.so  
libpaho-embed-mqtt3c.so
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7、目标机（海思3519A/3516D）验证测试

mosquitto代理主机准备：
代理主机地址：192.168.1.77
检查mosquitto是否启动：ps ax
得到：

632 ?        Ss     0:04 /usr/sbin/mosquitto -c /etc/mosquitto/mosquitto.conf
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目录 /etc/mosquitto/conf.d 下编辑文件 mosquitto.conf
设置代理端口为：1813
重启mosquitto
目录 /media/sf_share/code/mqtt/paho.mqtt.embedded-c-master/MQTTClient/test 下文件 test1.cpp：

    344 int test1(struct Options options)
    345 {
    346         MQTT::QoS subsqos = MQTT::QOS2;
    347         int rc = 0;
    348         const char* test_topic = "C client test1";
    349 
    350         fprintf(xml, "<testcase classname=\"test1\" name=\"single threaded client using receive\"");
    351         global_start_time = start_clock();
    352         failures = 0;
    353         MyLog(LOGA_INFO, "Starting test 1 - single threaded client using receive");
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获知订阅主题是：“C client test1”
代理主机打开订阅命令，用于目标机发送过来的消息：

mosquitto_sub -h localhost -p 1813 -t "C client test1" -v
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目标机准备：
目录 /media/sf_share/code/mqtt/paho.mqtt.embedded-c-master/MQTTClient/test 下编辑 test1.cpp，修改代理主机地址和端口：

    44 struct Options
     45 {
     46         char* host;         /**< connection to system under test. */
     47   int port;
     48         char* proxy_host;
     49   int proxy_port;
     50         int verbose;
     51         int test_no;
     52         int MQTTVersion;
     53         int iterations;
     54 } options =
     55 {
     56 //      (char*)"localhost",
     57 (char*)"192.168.1.77",
     58   1813,
     59         (char*)"localhost",
     60   1885, 
     61         0,
     62         0,
     63         4,
     64         1,
     65 };     
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回到目录 /media/sf_share/code/mqtt/paho.mqtt.embedded-c-master/build 下，重新编译：

rm -rf !(cmake.sh)
./cmake.sh
make
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目录 /media/sf_share/code/mqtt/paho.mqtt.embedded-c-master/build/MQTTClient/test 下执行文件是：
testcpp1，把它拷贝到目标机nfs挂载目录：cp testcpp1 /home/nfs/
此时执行文件在目标机的位置是：192.168.1.69:/mnt/nfs
测试：
目标机配置执行加载库环境：

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/mnt/nfs/lib_mqtt
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执行：./testcpp1
此时，如果正常的话，订阅端收到如下消息：

C client test1 a much long
C client test1 a much long
C client test1 a much long
C client test1 a much long
C client test1 a much long
C client test1 a much long
C client test1 a much long
C client test1 a much long
C client test1 a much long
C client test1 a much long
C client test1 a much long
C client test1 a much long
C client test1 a much long
C client test1 a much long
C client test1 a much long
C client test1 a much long
C client test1 a much long
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大功告成！！

mqtt环境的搭建记录，为后面做铺垫：mqtt + protobuf