基于MQTT协议实现微信小程序控制树莓派

在我的github上有源码，大家可以直接下载来用
https://github.com/yjc-123/-MQTT- ，这里给大家说一下实现的过程。
小程序端：
需要将我的github文件引入这三个文件

这是github上的源码，具体网站https://github.com/mqttjs/MQTT.js，我们需要讲上述文件引入才可已使用mqtt。

• 源码
  你只需要修改opt的信息就行了。test是你在EMQ创建的用户和密码。另外就是你服务器的域名，这里需要ssl，所以你在这个过程中需要讲域名安装证书。

import mqtt from '../../utils/mqtt.js';
//连接的服务器域名，注意格式！！！
const host = 'wxs://www.iot-yjc.cn/mqtt';
Page({ 

  data: { 
    client: null,
    //记录重连的次数
    reconnectCounts: 0,
    //MQTT连接的配置
    options: { 
      protocolVersion: 4, //MQTT连接协议版本c
      clientId: 'wx_' + parseInt(Math.random() * 100 + 800, 10),
      clean: false,
      password: 'test',
      username: 'test',
      reconnectPeriod: 1000, //1000毫秒，两次重新连接之间的间隔
      connectTimeout: 30 * 1000, //1000毫秒，两次重新连接之间的间隔
      resubscribe: true //如果连接断开并重新连接，则会再次自动订阅已订阅的主题（默认true）
    }
  },
  onClick_connect: function() { 

    var that = this;
    //开始连接
    this.data.client = mqtt.connect(host, this.data.options);
    this.data.client.on('connect', function(connack) { 
      wx.showToast({ 
        title: '连接成功'
      })
    })


    //服务器下发消息的回调
    that.data.client.on("message", function(topic, payload) { 
      console.log(" 收到 topic:" + topic + " , payload :" + payload)
      wx.showModal({ 
        content: " 收到topic:[" + topic + "], payload :[" + payload + "]",
        showCancel: false,
      });
    })


    //服务器连接异常的回调
    that.data.client.on("error", function(error) { 
      console.log(" 服务器 error 的回调" + error)

    })

    //服务器重连连接异常的回调
    that.data.client.on("reconnect", function() { 
      console.log(" 服务器 reconnect的回调")

    })


    //服务器连接异常的回调
    that.data.client.on("offline", function(errr) { 
      console.log(" 服务器offline的回调")

    })


  },
  onClick_SubOne: function() { 
    if (this.data.client && this.data.client.connected) { 
      //仅订阅单个主题
      this.data.client.subscribe('Topic0', function(err, granted) { 
        if (!err) { 
          wx.showToast({ 
            title: '订阅主题成功'
          })
        } else { 
          wx.showToast({ 
            title: '订阅主题失败',
            icon: 'fail',
            duration: 2000
          })
        }
      })
    } else { 
      wx.showToast({ 
        title: '请先连接服务器',
        icon: 'none',
        duration: 2000
      })
    }
  },
  onClick_SubMany: function() { 

    if (this.data.client && this.data.client.connected) { 
      //仅订阅多个主题
      this.data.client.subscribe({ 
        'Topic1': { 
          qos: 0
        },
        'Topic2': { 
          qos: 1
        }
      }, function(err, granted) { 
        if (!err) { 
          wx.showToast({ 
            title: '订阅多主题成功'
          })
        } else { 
          wx.showToast({ 
            title: '订阅多主题失败',
            icon: 'fail',
            duration: 2000
          })
        }
      })
    } else { 
      wx.showToast({ 
        title: '请先连接服务器',
        icon: 'none',
        duration: 2000
      })
    }
  },

  //发布消息
  listenerSwitch: function(e) { 
    if (this.data.client && this.data.client.connected){ 
      if( e.detail.value == true){ 
        this.data.client.publish('test', '打开');
        wx.showToast({ 
          title: '发布成功'
        })
      }
      else if(e.detail.value == false){ 
        this.data.client.publish('test', '关闭');
        wx.showToast({ 
          title: '发布成功'
        })
      }
      else{ }
    }
    console.log('switch类型开关当前状态-----', e.detail.value);},
  onClick_PubMsg: function() { 
    if (this.data.client && this.data.client.connected) { 
      this.data.client.publish('test', '打开');
      wx.showToast({ 
        title: '发布成功'
      })
    } else { 
      wx.showToast({ 
        title: '请先连接服务器',
        icon: 'none',
        duration: 2000
      })
    }
  },



  onClick_unSubOne: function() { 
    if (this.data.client && this.data.client.connected) { 
      this.data.client.unsubscribe('Topic1');
    } else { 
      wx.showToast({ 
        title: '请先连接服务器',
        icon: 'none',
        duration: 2000
      })
    }
  },
  onClick_unSubMany: function() { 
    if (this.data.client && this.data.client.connected) { 
      this.data.client.unsubscribe(['Topic1', 'Topic2']);
    } else { 
      wx.showToast({ 
        title: '请先连接服务器',
        icon: 'none',
        duration: 2000
      })
    }
  },
  onLoad: function() { 
    wx.setNavigationBarTitle({ 
      title: '简单服务器Mqtt连接'
    })
  }
})

• 域名安装证书
  1、首先在阿里云下载ssl证书，然后再服务器下载宝塔面板
  2、在宝塔中下载nignx，然后添加站点
  
  3、点击设置–>ssl，输入密钥和证书，点击保存。
  
  4、添加nignx反向代理
  
  

location = /mqtt { 
        # 8083就是我们的emq的websocket的端口号
        proxy_pass http://www.xxxxxxx.com:8083;
        proxy_redirect off;
        proxy_set_header Host www.xxxxxxx.com:8083;

        proxy_set_header Sec-WebSocket-Protocol mqtt;
        
        # 这个是与你的 js客户端的库有关系，本博文的不需要，为了兼顾以后小伙伴，我这里注释了下！ 
        #more_clear_headers Sec-WebSocket-Protocol;

        # 这些都是 websocket必须要配置的
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        }
}

树莓派：
这边只需要实现订阅跟发布就行了。

• 发布

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "MQTTClient.h"

#define ADDRESS "59.110.42.24:1883"
#define CLIENTID "0bd981c5-a055-4196-8b7f-efb9f7a4d6ac"
#define TOPIC "test"
#define PAYLOAD "Hello World!"
#define QOS 1
#define TIMEOUT 10000L

int main(int argc, char* argv[])
{ 
    //声明mqtt客户端
    MQTTClient client;
    //初始化客户端选项 conn_opts
    MQTTClient_connectOptions conn_opts = MQTTClient_connectOptions_initializer;
    //消息初始化 pubmsg
    MQTTClient_message pubmsg = MQTTClient_message_initializer;
    MQTTClient_deliveryToken token;
    int rc;
    char *username = "test";
    char *password = "test";
    if ((rc = MQTTClient_create(&client, ADDRESS, CLIENTID,
        MQTTCLIENT_PERSISTENCE_NONE, NULL)) != MQTTCLIENT_SUCCESS)
    { 
         printf("Failed to create client, return code %d\n", rc);
         exit(EXIT_FAILURE);
    }
    //保持心跳20
    conn_opts.keepAliveInterval = 20;
    //清理会话
    conn_opts.cleansession = 1;
    //客户端的用户名和密码
    conn_opts.username = username;
    conn_opts.password = password;
    //创建连接
    if ((rc = MQTTClient_connect(client, &conn_opts)) != MQTTCLIENT_SUCCESS)
    { 
        printf("Failed to connect, return code %d\n", rc);
        exit(EXIT_FAILURE);
    }
    //消息负载（内容）
    pubmsg.payload = PAYLOAD;
    //消息长度
    pubmsg.payloadlen = (int)strlen(PAYLOAD);
    //消息质量分为0：不重要的消息比如温度，可以多次上传丢失一次没事。1：可能会丢失1次 2：永远不会丢失
    pubmsg.qos = QOS;
    //有true和false 判断消息是否保留
    pubmsg.retained = 0;
    //发布消息 token是消息发布后，传递令牌将返回客户端检查令牌是否已成功传递到其目的地
    if ((rc = MQTTClient_publishMessage(client, TOPIC, &pubmsg, &token)) != MQTTCLIENT_SUCCESS)
    { 
         printf("Failed to publish message, return code %d\n", rc);
         exit(EXIT_FAILURE);
    }

    printf("Waiting for up to %d seconds for publication of %s\n"
            "on topic %s for client with ClientID: %s\n",
            (int)(TIMEOUT/1000), PAYLOAD, TOPIC, CLIENTID);
    //阻塞函数，等待消息发布
    rc = MQTTClient_waitForCompletion(client, token, TIMEOUT);
    printf("Message with delivery token %d delivered\n", token);

    if ((rc = MQTTClient_disconnect(client, 10000)) != MQTTCLIENT_SUCCESS)
    	printf("Failed to disconnect, return code %d\n", rc);
    //断开连接
    MQTTClient_destroy(&client);
    return rc;
}

• 订阅

#coding=utf-8
import paho.mqtt.client as mqtt
import time
import RPi.GPIO as GPIO
import sys
reload(sys)
sys.setdefaultencoding('utf-8')
HOST = "59.110.42.24"
PORT = 1883
GPIO_PIN = 17
GPIO.setmode(GPIO.BCM)
GPIO.setup(GPIO_PIN, GPIO.OUT)
def client_loop():
    client_id = "0bd981c5-a055-4196-8b7f-efb9f7a4d6ac"
    client = mqtt.Client(client_id)    # ClientId不能重复，所以使用当前时间
    client.username_pw_set("test", "test")  # 必须设置，否则会返回「Connected with result code 4」
    client.on_connect = on_connect
    client.on_message = on_message
    client.connect(HOST, PORT, 60)
    client.loop_forever()

def on_connect(client, userdata, flags, rc):
    client.subscribe("test")

def trun(a):
    
    if(a == "打开"):
        GPIO.output(GPIO_PIN,GPIO.HIGH)
    else:
        GPIO.output(GPIO_PIN,GPIO.LOW)

def on_message(client, userdata, msg):

    print(msg.topic+" "+msg.payload.decode("utf-8"))
    trun(msg.payload.decode("utf-8"))

if __name__ == '__main__':
    global a
    a = -1
    client_loop()

• 发布

#!/usr/bin/env python  
# encoding: utf-8 

import json
import sys
import os
import paho.mqtt.client as mqtt
import time
 
sys.path.append(os.path.abspath(os.path.dirname(__file__) + '/' + '..'))
sys.path.append("..")
 
TASK_TOPIC = 'test'  # 客户端发布消息主题

client_id = time.strftime('%Y%m%d%H%M%S',time.localtime(time.time()))

client = mqtt.Client(client_id, transport='tcp')
 
client.connect("59.110.42.24", 1883, 60)  # 此处端口默认为1883，通信端口期keepalive默认60
client.loop_start()
 
 
def clicent_main(message: str):
    
    time_now = time.strftime('%Y-%m-%d %H-%M-%S', time.localtime(time.time()))
    payload = { "msg": "%s" % message, "data": "%s" % time_now}
    # publish(主题：Topic; 消息内容)
    client.publish(TASK_TOPIC, json.dumps(payload, ensure_ascii=False))
    client.publish(TASK_TOPIC,message)
    print("Successful send message!")
    return True
if __name__ == '__main__':
    msg = "我是一条测试数据！"
    clicent_main(msg)

emq服务器
在我之前的博客中有emq服务器怎么安装。这是最终效果，我小程序只要点击打开就会发送打开，点击关闭就会关闭