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
