esp8266-01s接入物联网
1.创建产品
2.创建设备
3.打开arduino 编写代码
#include <ESP8266WiFi.h>/* 依赖 PubSubClient 2.4.0 */#include <PubSubClient.h>#include <ArduinoJson.h>/* 连接您的WIFI SSID和密码 */#define WIFI_SSID "wifi名称"#define WIFI_PASSWD "wifi密码"/* 线上环境域名和端口号 */#define MQTT_SERVER "地址"#define MQTT_PORT 1883 //端口号#define MQTT_USRNAME"用户名"#define CLIENT_ID "client ID"#define MQTT_PASSWD "密码"//发布消息用的topic#define PubTopic "topic"int ledPin = 2;int GPIO = 0;unsigned long lastMs = 0;WiFiClient espClient;PubSubClient client(espClient);//收到消息后的回调函数void callback(char *topic, byte *payload, unsigned int length){Serial.print("Message arrived [");Serial.print(topic);Serial.print("] ");payload[length] = '\0';Serial.println((char *)payload);//解析json字符串DynamicJsonDocument doc(1024);deserializeJson(doc, payload);JsonObject obj = doc.as<JsonObject>();if (obj["a"] == "on") {setLed();Serial.println();Serial.print("on 关灯");digitalWrite(ledPin, HIGH); // 关digitalWrite(GPIO, LOW);//低电平默认继电器关闭Serial.println();pubMsg("关灯");}if (obj["a"] == "off") {setLed();Serial.println();Serial.print("off 开灯");digitalWrite(ledPin, LOW);//led 亮digitalWrite(GPIO, HIGH);//低电平默认继电器关闭Serial.println();pubMsg("开灯");}}//wifi初始化void wifiInit(){WiFi.mode(WIFI_STA);WiFi.begin(WIFI_SSID, WIFI_PASSWD);while (WiFi.status() != WL_CONNECTED) {Serial.println("WiFi not Connect");}Serial.println("Connected to AP");Serial.println("IP address: ");Serial.println(WiFi.localIP());Serial.print("espClient [");client.setServer(MQTT_SERVER, MQTT_PORT); /* 连接WiFi之后，连接MQTT服务器 */client.setCallback(callback);}//发布消息/*********************************************************************///发布一个字符串的消息void pubMsg(char *msg){boolean d = client.publish(PubTopic, msg);if (d) {Serial.println("publish success");} else {Serial.println("publish fail");}}//发布指定长度的字符消息void pubMsgLen(uint8_t *msg, int len){boolean d = client.publish(PubTopic, msg, len);if (d) {Serial.println("publish success");} else {Serial.println("publish fail");}}/*********************************************************************///连接到服务器void mqttCheckConnect(){while (!client.connected()) {Serial.println("Connecting to MQTT Server ...");if (client.connect(CLIENT_ID, MQTT_USRNAME, MQTT_PASSWD)) {Serial.println("MQTT Connected!");} else {Serial.print("MQTT Connect err:");Serial.println(client.state());delay(5000);}}}void setup(){/* initialize serial for debugging */Serial.begin(115200); //开启串口pinMode(ledPin, OUTPUT);pinMode(GPIO, OUTPUT);digitalWrite(ledPin, HIGH);//关灯digitalWrite(GPIO, LOW);//低电平默认继电器关闭Serial.println("Demo Start");wifiInit();//连接wifiunsigned char i = 0;mqttCheckConnect();//连接阿里云pubMsg("已连接阿里云物联网平台 ，hello aliyun!");}void setLed() {digitalWrite(ledPin, LOW);delay(500);digitalWrite(ledPin, HIGH);delay(500);}// the loop function runs over and over again forevervoid loop(){client.loop();//保持客户端的连接}
