mqtt的开源实现mosquitto的交叉编译与使用

mqtt协议是最近比较流行的即时推送的协议
到 http://mosquitto.org/download/ 下载源码
或者跟我一样我直接下git
$ git clone git://git.eclipse.org/gitroot/mosquitto/org.eclipse.mosquitto.git
$ cd  org.eclipse.mosquitto/
编译pc平台的
$ make WITH_SRV=no
运行
$ cp src/mosquitto mosquitto_pc
$ cp client/mosquitto_pub mosquitto_pub_pc
$ sudo make install
运行服务器
$ mosquitto_pc -v
pc ip是 192.168.0.108

编译arm平台的
make clean
make WITH_SRV=no CC=arm-linux-gcc CXX=arm-linux-g++
需要
./lib/libmosquitto.so.1
./client/mosquitto_sub拷贝到开发板上
(这种方式编译还需要libssl， libcrypto库,请自行拷贝)

如果要指定ssl的库位置
make WITH_SRV=no CC=arm-linux-gcc CXX=arm-linux-g++ CFLAGS="-I/thirdparty/include/ -L/thirdparty/lib" LDFLAGS="-L/thirdparty/lib -lssl -lcrypto"


在开发板上运行,订阅hello
mosquitto_sub -v -t hello -h  192.168.0.108

pc 机中推送
mosquitto_pub -t hello -h 192.168.0.108 -m "world"
【-h】指定MQTT代理服务器主机，指向PC机IP地址

开发板上会收到会打印：hello world

mosquitto用的是poll, 有一种epoll版本的，能支持更多的并发连接
https://bitbucket.org/wowsoso/mosquitto/src/e3a9efbbb06b6820057ecc40b91df79f0fabce93/src/loop.c?at=default

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