两个模块，一个模块为按键，另一个模块为led，暂时先连上MQTT
#include <ESP8266WiFi.h>
#include <PubSubClient.h>const char* ssid = "Xiaomi_1EDE"; // 连接 WiFi名 ，修改为自己的WiFi名
const char* password = "1234567890"; // 连接 WiFi密码，修改为自己的WiFi密码const char *mqtt_server = "183.230.40.96"; //OneNet MQTT接入服务器IP，按开发文档说明设置
const uint16_t mqttPort = 6002; //端口号const char *productId = "375006"; //产品id
const char *apiKey = "aFKcWTrm6VJfgfF1pQqW2=NWDck="; //鉴权信息
const char *deviceId = "633517037"; //设备idconst char *topic ="esp8266LED";WiFiClient espClient;
PubSubClient client(espClient);void setup() {pinMode(BUILTIN_LED, OUTPUT); // Initialize the BUILTIN_LED pin as an outputSerial.begin(115200);setup_wifi();client.setServer(mqtt_server, mqttPort);client.setCallback(callback);
}void loop() {ESP.wdtFeed();if (!client.connected()) {reconnect();}client.loop();delay(2000);
}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); // Turn the LED on (Note that LOW is the voltage level// but actually the LED is on; this is because// it is active low on the ESP-01)} else {digitalWrite(BUILTIN_LED, HIGH); // Turn the LED off by making the voltage HIGH}}void reconnect() {// Loop until we're reconnectedwhile (!client.connected()) {Serial.println("Connect to OneNet MQTT...");/*** 参考OneNet mqtt连接报文* ClientIdentifier: 创建设备时得到的设备ID* UserName: 注册产品时，平台分配的产品ID* UserPassword: 为设备的鉴权信息（即唯一设备编号，SN），或者为apiKey*/ if (client.connect(deviceId,productId,apiKey)) {Serial.println("connect success!");client.subscribe(topic);} else {Serial.print("connect fail!");Serial.println(" try again in 5 seconds");delay(5000); // Wait 5 seconds before retrying}}
}void setup_wifi() {delay(100);// We start by connecting to a WiFi networkSerial.println();Serial.print("Connecting to ");Serial.println(ssid);WiFi.mode(WIFI_STA);WiFi.begin(ssid, password);while (WiFi.status() != WL_CONNECTED) {delay(500);Serial.print(".");}Serial.println("");Serial.println("WiFi connected");Serial.println("IP address: ");Serial.println(WiFi.localIP());
}