環境資訊：

1. Linux Centos7.2 環境，CPU 2核，記憶體8G.

2. mosquitto版本：mosquitto-1.5.4

官網：http://mosquitto.org/download/
libwebsockets官網： https://libwebsockets.org/

本環境搭建，主要用到了mosquitto，麼有涉及websocket的內容，所以，這裡不做安裝介紹。

搭建過程：

1. 安裝mosquitto-1.5.4

下載解壓縮mosquitto-1.5.4.tar.gz。然後執行make

[[email protected] mosquitto-1.5
 
.4]# make
set -e; for d in lib client src; do make -C ${d}; done
make[1]: Entering directory `/opt/mosquitto-1.5.4/lib'
cc -Wall -ggdb -O2  -I. -I.. -I../lib -fPIC -DWITH_TLS -DWITH_TLS_PSK -DWITH_THREADING -DWITH_SOCKS -c mosquitto.c -o mosquitto.o
In file included from mosquitto.c:27:0:
mosquitto_internal.h:
 
28:27: fatal error: openssl/ssl.h: No such file or directory
 #  include <openssl/ssl.h>
                           ^
compilation terminated.
make[1]: *** [mosquitto.o] Error 1
make[1]: Leaving directory `/opt/mosquitto-1.5.4/lib'
make: *** [mosquitto] Error 2

上述錯誤是因為沒有安裝openssl-devel。安裝上openssl-devel即可解決： yum install openssl-devel

make -C cpp
make[2]: Entering directory `/opt/mosquitto-1.5.4/lib/cpp'
g++ -Wall -ggdb -O2  -I. -I.. -I../lib -fPIC -c mosquittopp.cpp -o mosquittopp.o
make[2]: g++: Command not found
make[2]: *** [mosquittopp.o] Error 127
make[2]: Leaving directory `/opt/mosquitto-1.5.4/lib/cpp'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/opt/mosquitto-1.5.4/lib'

上述錯誤是因為沒有安裝gcc-c++. 安裝上gcc-c++即可解決： yum install gcc-c++

cc -I.. -Wall -ggdb -O2  -c mosquitto_passwd.c -o mosquitto_passwd.o
cc mosquitto_passwd.o -o mosquitto_passwd  -lcrypto
make[1]: Leaving directory `/opt/mosquitto-1.5.4/src'
set -e; for d in man; do make -C ${d}; done
make[1]: Entering directory `/opt/mosquitto-1.5.4/man'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `/opt/mosquitto-1.5.4/man'

上述錯誤是因為沒有安裝c-ares-devel. 安裝上c-ares-devel即可解決： yum install c-ares-devel

解決上面的問題，可以一次安裝下面的所有的依賴：yum -y install gcc gcc-c++ openssl-devel c-ares-devel libuuid-devel wget cmake

[[email protected] mosquitto-1.5.4]# yum -y install gcc gcc-c++ openssl-devel c-ares-devel libuuid-devel wget cmake
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Package gcc-4.8.5-28.el7.x86_64 already installed and latest version
Package gcc-c++-4.8.5-28.el7.x86_64 already installed and latest version
Package 1:openssl-devel-1.0.2k-12.el7.x86_64 already installed and latest version
Package c-ares-devel-1.10.0-3.el7.x86_64 already installed and latest version
Package libuuid-devel-2.23.2-52.el7.x86_64 already installed and latest version
Package wget-1.14-15.el7_4.1.x86_64 already installed and latest version
Package cmake-2.8.12.2-2.el7.x86_64 already installed and latest version

2. 配置mosquitto

進入/etc/mosquitto目錄

[[email protected] mosquitto]# cp mosquitto.conf.example mosquitto.conf
[[email protected] mosquitto]# cp pwfile.example pwfile

vi mosquitto.conf，做下面配置

allow_anonymous true
password_file /etc/mosquitto/pwfile

然後，在檔案最末尾補充（mosquitto服務監聽的埠）：

port 1883

listener 9090

protocol websockets

3. 啟動mosquitto

[[email protected] mosquitto]# mosquitto -c /etc/mosquitto/mosquitto.conf
Error: Websockets support not available.
Error found at /etc/mosquitto/mosquitto.conf:874.
Error: Unable to open configuration file.

這個錯誤，是因為我沒有安裝websockets模組，另外，config.mk裡面的websocket沒有配置為YES。所以將配置中websocket的註釋掉即可。

#listener 9090
#protocol websockets

再次啟動：

[[email protected] mosquitto]# mosquitto -c /etc/mosquitto/mosquitto.conf
1544435834: mosquitto version 1.5.4 starting
1544435834: Config loaded from /etc/mosquitto/mosquitto.conf.
1544435834: Opening ipv4 listen socket on port 1883.
1544435834: Opening ipv6 listen socket on port 1883.
1544435834: Error: Invalid user 'mosquitto'.

上述錯誤顯示沒有mosquitto使用者，建立使用者並新增組。

[[email protected] mosquitto]# groupadd mosquitto
[[email protected] mosquitto]# useradd -g mosquitto mosquitto

最後再次啟動：

[[email protected] mosquitto]# mosquitto -c /etc/mosquitto/mosquitto.conf
1544436204: mosquitto version 1.5.4 starting
1544436204: Config loaded from /etc/mosquitto/mosquitto.conf.
1544436204: Opening ipv4 listen socket on port 1883.
1544436204: Opening ipv6 listen socket on port 1883.

此時，mosquitto以前臺服務的方式在執行。。。如何使用，請看幫助資訊：

[[email protected] mosquitto]# mosquitto --help
mosquitto version 1.5.4

mosquitto is an MQTT v3.1.1 broker.

Usage: mosquitto [-c config_file] [-d] [-h] [-p port]

 -c : specify the broker config file.
 -d : put the broker into the background after starting.
 -h : display this help.
 -p : start the broker listening on the specified port.
      Not recommended in conjunction with the -c option.
 -v : verbose mode - enable all logging types. This overrides
      any logging options given in the config file.

See http://mosquitto.org/ for more information.

4. 測試驗證

[[email protected] ~]# mosquitto_sub -t rulee
mosquitto_sub: error while loading shared libraries: libmosquitto.so.1: cannot open shared object file: No such file or directory

此處錯誤，表明動態庫沒有配合好路徑，參照下面的操作（主要是紅色的兩行指令）：

[[email protected] ~]# cat /etc/ld.so.conf
include ld.so.conf.d/*.conf
[[email protected] ~]# 
[[email protected] ~]# echo "/usr/local/lib" >> /etc/ld.so.conf
[[email protected] ~]# 
[[email protected] ~]# vi /etc/ld.so.conf
include ld.so.conf.d/*.conf
/usr/local/lib
[[email protected] ~]# ldconfig

然後再次訂閱一個rulee的topic：

然後，再啟動一個終端，進行釋出訊息操作：

[[email protected] ~]# mosquitto_pub -h localhost -t rulee -m "hello rule engine"

在上面的訂閱視窗已經收到這個釋出的訊息

[[email protected] ~]# mosquitto_sub -t rulee                  
hello rule engine

安全控制：

上面的操作，是針對無安全控制的，下面，進行帶安全控制的配置，進入/etc/mosquitto目錄：

[[email protected] mosquitto]# cp mosquitto.conf.example mosquitto.conf
[[email protected] mosquitto]# cp pwfile.example pwfile
[[email protected] mosquitto]# cp aclfile.example aclfile

vi mosquitto.conf，做下面配置

allow_anonymous false
password_file /etc/mosquitto/pwfile
acl_file /etc/mosquitto/aclfile

然後，在檔案最末尾補充監聽埠（若沒有配置的話）： port 1883

新增安全使用者資訊：

[[email protected] mosquitto]# mosquitto_passwd -c /etc/mosquitto/pwfile shihuc
Password: 
Reenter password: 

重新啟動mosquitto服務：

[[email protected] mosquitto]# mosquitto -d -c /etc/mosquitto/mosquitto.conf

訂閱：

[[email protected] ~]# mosquitto_sub -t rulee                  
hello rule engine
Connection Refused: not authorised.
[[email protected] ~]# 
[[email protected] ~]# 
[[email protected] ~]# mosquitto_sub -t /taikang/rulee -u shihuc -P shihuc

釋出：

[[email protected] ~]# mosquitto_pub -h localhost -t /taikang/rulee -m "hello rule engine with auth"
Connection Refused: not authorised.
Error: The connection was refused.
[[email protected] ~]# 
[[email protected] ~]# 
[[email protected] ~]# mosquitto_pub -u shihuc -P shihuc -h localhost -t /taikang/rulee -m "hello rule engine with auth" 
[[email protected] ~]#