基于MQTT阿里云物联网手机远程控制ESP8266

1、视频教程

https://www.bilibili.com/video/BV1mJ411r7M9/?spm_id_from=333.788.videocard.9

资料下载：

https://download.csdn.net/download/weixin_42269817/15406748

自己服务器打开把mqttd这个文件复制进来

一开始运行可能会报我这个错误

解决办法：https://www.microsoft.com/zh-cn/download/confirmation.aspx?id=40784

下载自己对应的位的直接在服务器里面默认安装

2、查询服务器的ipv4然后（这里替换自己的ipv4）http://172.21.87.83:18083/#/

默认的用户名和密码：

admin

public

ESP8266代码：

/*Basic ESP8266 MQTT exampleThis sketch demonstrates the capabilities of the pubsub library in combinationwith the ESP8266 board/library.It connects to an MQTT server then:- publishes "hello world" to the topic "outTopic" every two seconds- subscribes to the topic "inTopic", printing out any messagesit receives. NB - it assumes the received payloads are strings not binary- If the first character of the topic "inTopic" is an 1, switch ON the ESP Led,else switch it offIt will reconnect to the server if the connection is lost using a blockingreconnect function. See the 'mqtt_reconnect_nonblocking' example for how toachieve the same result without blocking the main loop.To install the ESP8266 board, (using Arduino 1.6.4+):- Add the following 3rd party board manager under "File -> Preferences -> Additional Boards Manager URLs":http://arduino.esp8266.com/stable/package_esp8266com_index.json- Open the "Tools -> Board -> Board Manager" and click install for the ESP8266"- Select your ESP8266 in "Tools -> Board"*/#include <ESP8266WiFi.h>
#include <PubSubClient.h>// Update these with values suitable for your network.const char* ssid = "123321";
const char* password = "12345678";
const char* mqtt_server = "47.113.118.21";WiFiClient espClient;
PubSubClient client(espClient);
long lastMsg = 0;
char msg[50];
int value = 0;void setup_wifi() {delay(10);// We start by connecting to a WiFi networkSerial.println();Serial.print("Connecting to ");Serial.println(ssid);WiFi.begin(ssid, password);while (WiFi.status() != WL_CONNECTED) {delay(500);Serial.print(".");}randomSeed(micros());Serial.println("");Serial.println("WiFi connected");Serial.println("IP address: ");Serial.println(WiFi.localIP());
}void callback(char* topic, byte* payload, unsigned int length) {Serial.print("Message arrived [");Serial.print(topic);Serial.print("] ");for (int i = 0; i < length; i++) {Serial.print((char)payload[i]);}Serial.println();// Switch on the LED if an 1 was received as first characterif ((char)payload[0] == '1') {digitalWrite(BUILTIN_LED, LOW);   }if ((char)payload[0] == '0'){digitalWrite(BUILTIN_LED, HIGH);  }}void reconnect() {// Loop until we're reconnectedwhile (!client.connected()) {Serial.print("Attempting MQTT connection...");// Create a random client IDString clientId = "ESP8266Client-";clientId += String(random(0xffff), HEX);// Attempt to connectif (client.connect(clientId.c_str())) {Serial.println("connected");// Once connected, publish an announcement...client.publish("outTopic", "hello world");// ... and resubscribeclient.subscribe("inTopic");} else {Serial.print("failed, rc=");Serial.print(client.state());Serial.println(" try again in 5 seconds");// Wait 5 seconds before retryingdelay(5000);}}
}void setup() {pinMode(BUILTIN_LED, OUTPUT);     // Initialize the BUILTIN_LED pin as an outputSerial.begin(115200);setup_wifi();client.setServer(mqtt_server, 1883);client.setCallback(callback);reconnect();while(!client.subscribe("led",0)){Serial.println("订阅失败;尝试重新订阅！");client.subscribe("led",0);delay(300);}Serial.println("订阅成功~~~");
}void loop() {if (!client.connected()) {reconnect();}client.loop();long now = millis();if (now - lastMsg > 2000) {lastMsg = now;++value;snprintf (msg, 50, "This is message :%ld", value);Serial.print("Publish message: ");Serial.println(msg);client.publish("text", msg);}
}

此外遇到问题：

会话里面什么都没有

解决：阿里云服务器控制台：

我直接端口全开

最后成功

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