编译安装 MQTT mosquitto 遇到的问题和解法

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从官网（http://mosquitto.org/download/）下载了 1.3.5 的版本，解压后编译失败

:~/Downloads/mosquitto-1.3.5$ make

set -e; for d in lib client src; do /Applications/Xcode.app/Contents/Developer/usr/bin/make -C ${d}; done

cc -Wall -ggdb -O2 -I. -I.. -I../lib -fPIC -DWITH_TLS -DWITH_TLS_PSK -DWITH_THREADING -DWITH_SRV -c mosquitto.c -o mosquitto.o

In file included from mosquitto.c:46:

./mosquitto_internal.h:51:12:fatal error: 'ares.h' file not found

# include <ares.h>

解决：

缺少 ares 库，c-ares is a C library for asynchronous DNS requests (including name resolves). http://c-ares.haxx.se

下载源码： wgethttp://c-ares.haxx.se/download/c-ares-1.10.0.tar.gz

解压： tar -zxf c-ares-1.10.0.tar.gz

cd c-ares-1.10.0

./configure

sudo make install

然后再回到 mosquitto 的目录，就可以正常编译了。

编译完成会生成四个可执行文件：

:~/Downloads/mosquitto-1.3.5$ mosquitto
mosquitto mosquitto_passwd mosquitto_pub mosquitto_sub

开启 mosquitto 服务：

mosquitto -c /etc/mosquitto/mosquitto.conf -d

复制库文件

sudo cp lib/libmosquitto.so.1 /usr/lib~/Downloads/mosquitto-1.3.5$ ldconfig

测试publish 和 subscribe：

打开两个终端

一个里面执行：

mosquitto_sub -c -h localhost -k keepalive -p 1883 -q 1 -t "mosquitto"

另一个执行

mosquitto_pub -h localhost -p 1883 -q 1 -m "./compiling.txt" -t "mosquitto"

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