ESP8266 for arduino 如何连接到阿里云物联网平台（AliYun）

前言

最近物联网越来越火，阿里也出了自己的物联网平台，对于物联网工程师来说，简直是天大的福音。阿里云物联网平台支持MQTT，手头上正好有ESP8266开发板，拿来练练手。对于开发ESP8266的小伙伴们来说，开发8266可以用SDK或者Arduino来开发，Arduino极大的简化了开发复杂度，所以本次开发就用Arduino。

工具准备

1.一个ESP8266开发板

阿里云平台注册设备(创建高级设备)

1.创建教程https://help.aliyun.com/document_detail/73705.html?spm=a2c4g.11174283.4.4.3a8b1668DyM7sV

2.主要地方用图说明

代码

1.修改ESP8266.ino

#include 
#include 
#include 

#include "aliyun_mqtt.h"

// GPIO 13, D7 on the Node MCU v3
#define SENSOR_PIN 13

#define WIFI_SSID        "CMCC-123"//替换自己的WIFI
#define WIFI_PASSWD      "12345678"//替换自己的WIFI

#define PRODUCT_KEY      "abcvfg" //替换自己的PRODUCT_KEY
#define DEVICE_NAME      "Temp_Sensor" //替换自己的DEVICE_NAME
#define DEVICE_SECRET    "QhT3OdM9Yi4izSgiXdjKOPIoCzQbVcLy"//替换自己的DEVICE_SECRET

#define DEV_VERSION       "S-TH-WIFI-v1.0-20190220"        //固件版本信息

#define ALINK_BODY_FORMAT         "{"id":"123","version":"1.0","method":"%s","params":%s}"
#define ALINK_TOPIC_PROP_POST     "/sys/" PRODUCT_KEY "/" DEVICE_NAME "/thing/event/property/post"
#define ALINK_TOPIC_PROP_POSTRSP  "/sys/" PRODUCT_KEY "/" DEVICE_NAME "/thing/event/property/post_reply"
#define ALINK_TOPIC_PROP_SET      "/sys/" PRODUCT_KEY "/" DEVICE_NAME "/thing/service/property/set"
#define ALINK_METHOD_PROP_POST    "thing.event.property.post"
#define ALINK_TOPIC_DEV_INFO      "/ota/device/inform/" PRODUCT_KEY "/" DEVICE_NAME ""    
#define ALINK_VERSION_FROMA      "{"id": 123,"params": {"version": "%s"}}"
unsigned long lastMs = 0;

WiFiClient   espClient;
PubSubClient mqttClient(espClient);

void init_wifi(const char *ssid, const char *password)
{
    WiFi.mode(WIFI_STA);
    WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED)
    {
        Serial.println("WiFi does not connect, try again ...");
        delay(500);
    }

    Serial.println("Wifi is connected.");
    Serial.println("IP address: ");
    Serial.println(WiFi.localIP());
}

void mqtt_callback(char *topic, byte *payload, unsigned int length)
{
    Serial.print("Message arrived [");
    Serial.print(topic);
    Serial.print("] ");
    payload[length] = '