ESP32 arduino方式连接阿里云

前言

笔者用ESP32的M5Stick-c开发版，参照ESP8266阿里云这篇文章，通过简单的修改完成了ESP32与阿里云IOT平台的快速连接

代码

#include <WiFi.h>
#include <Wire.h>
#include <PubSubClient.h>
#include <ArduinoJson.h>

#include "aliyun_mqtt.h"

#define SENSOR_PIN 10
 //以下信息需要自己修改
#define WIFI_SSID        "CMCC"//替换自己的WIFI
#define WIFI_PASSWD      "123456789"//替换自己的WIFI
 
#define PRODUCT_KEY      "abcdef" //替换自己的PRODUCT_KEY
#define DEVICE_NAME      "temp_sensor" //替换自己的DEVICE_NAME
#define DEVICE_SECRET    "VQo4KdxY2Jip6LaCeA8GVgVf4lIqa8Xh"//替换自己的DEVICE_SECRET
 //以下不需修改
#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] = '\0';
    Serial.println((char *)payload);
 
    if (strstr(topic, ALINK_TOPIC_PROP_SET))
    {
        StaticJsonBuffer<100> jsonBuffer;
        JsonObject &root = jsonBuffer.parseObject(payload);
        if (!root.success())
        {
            Serial.println("parseObject() failed");
            return;
        }
    }
}
void mqtt_version_post()
{
    char param[512];
    char jsonBuf[1024];
 
    //sprintf(param, "{\"MotionAlarmState\":%d}", digitalRead(13));
    sprintf(param, "{\"id\": 123,\"params\": {\"version\": \"%s\"}}", DEV_VERSION);
   // sprintf(jsonBuf, ALINK_BODY_FORMAT, ALINK_METHOD_PROP_POST, param);
    Serial.println(param);
    mqttClient.publish(ALINK_TOPIC_DEV_INFO, param);
}
void mqtt_check_connect()
{
    while (!mqttClient.connected())//
    {
        while (connect_aliyun_mqtt(mqttClient, PRODUCT_KEY, DEVICE_NAME, DEVICE_SECRET))
        {
            Serial.println("MQTT connect succeed!");
            //client.subscribe(ALINK_TOPIC_PROP_POSTRSP);
            mqttClient.subscribe(ALINK_TOPIC_PROP_SET);
            
            Serial.println("subscribe done");
            mqtt_version_post();
        }
    }
    
}
 
void mqtt_interval_post()
{
    char param[512];
    char jsonBuf[1024];
 
    //sprintf(param, "{\"MotionAlarmState\":%d}", digitalRead(13));
    sprintf(param, "{\"CurrentHumidity\":%d,\"CurrentTemperature\":18,\"GeoLocation\":{\"CoordinateSystem\":2,\"Latitude\":2,\"Longitude\":123,\"Altitude\":1}}", digitalRead(13));
    sprintf(jsonBuf, ALINK_BODY_FORMAT, ALINK_METHOD_PROP_POST, param);
    Serial.println(jsonBuf);
    mqttClient.publish(ALINK_TOPIC_PROP_POST, jsonBuf);
}
 
 
void setup()
{
    // Initialize the M5StickC object
    M5.begin();

    // LCD display
    M5.Lcd.print("Hello World");
 
    pinMode(SENSOR_PIN, INPUT);
    /* initialize serial for debugging */
    Serial.begin(115200);
 
    Serial.println("Demo Start");
 
    init_wifi(WIFI_SSID, WIFI_PASSWD);
 
    mqttClient.setCallback(mqtt_callback);
}
 
// the loop function runs over and over again forever
void loop()
{
    if (millis() - lastMs >= 20000)
    {
        lastMs = millis();
        mqtt_check_connect();
        /* Post */        
        mqtt_interval_post();
    }
 
    mqttClient.loop();
 
    unsigned int WAIT_MS = 2000;
    if (digitalRead(SENSOR_PIN) == HIGH)
    {
        Serial.println("Motion detected!");
    }
    else
    {
        Serial.println("Motion absent!");
    }
    delay(WAIT_MS); // ms
    Serial.println(millis() / WAIT_MS);
}

aliyun_mqtt.h

/*
  Aliyun_mqtt.h - Library for connect to Aliyun MQTT server with authentication by
  product key, device name and device secret.

  https://www.alibabacloud.com/help/product/30520.htm
*/

#ifndef _ALIYUN_MATT_H
#define _ALIYUN_MATT_H

#include "Arduino.h"
#include <PubSubClient.h>

/**
 * Connect to Alibaba Cloud MQTT server. In connection process, it will try several times for
 * possible network failure. For authentication issue, it will return false at once.
 *
 * @param mqttClient: Caller provide a valid PubSubClient object (initialized with network client).

 * @param productKey: Product Key, get from Alibaba Cloud Link Platform.

 * @param deviceName: Device Name, get from Alibaba Cloud Link Platform.

 * @param deviceSecret: Device Secret, get from Alibaba Cloud Link Platform.
 *
 * @param region: Optional region, use "cn-shanghai" as default. It can be "us-west-1",
 *                "ap-southeast-1" etc. Refer to Alibaba Cloud Link Platform.
 *
 *
 * @return true if connect succeed, otherwise false.
 */
extern "C" bool connect_aliyun_mqtt(
    PubSubClient &mqttClient,
    const char *productKey,
    const char *deviceName,
    const char *deviceSecret,
    const char *region = "cn-shanghai");

/**
 * Two new added APIs are designed for devices with limited resource like Arduino UNO.
 * Since it is hard to calculate HMAC256 on such devices, the calculation can be done externally.
 *
 * These two APIs should be used together with external HMAC256 calculation tools, e.g.
 * http://tool.oschina.net/encrypt?type=2
 * They can be used together to replace connectAliyunMQTT on resource-limited devices.
 */

/**
 * This API should be called in setup() phase to init all MQTT parameters. Since HMAC256
 * calculation is executed extenrally, a fixed timestamp string should be provided, such
 * as "23668" etc. The same timestamp string is also used to calculate HMAC256 result.
 *
 * Other params are similar to them in connectAliyunMQTT.
 */
extern "C" void mqtt_prepare(
    const char *timestamp,
    const char *productKey,
    const char *deviceName,
    const char *deviceSecret,
    const char *region = "cn-shanghai");

/**
 * Use tools here to calculate HMAC256: http://tool.oschina.net/encrypt?type=2
 * The calculated result should be defined as constants and passed when call this function.
 */
extern "C" bool connect_aliyun_mqtt_With_password(PubSubClient &mqttClient, const char *password);

#endif

aliyun_mqtt.cpp

/*
  Aliyun_mqtt.h - Library for connect to Aliyun MQTT server.
*/

#include "aliyun_mqtt.h"

#include <SHA256.h>

#define MQTT_PORT 1883
#define SHA256HMAC_SIZE 32

// Verify tool: http://tool.oschina.net/encrypt?type=2
static String hmac256(const String &signcontent, const String &ds)
{
  byte hashCode[SHA256HMAC_SIZE];
  SHA256 sha256;

  const char *key = ds.c_str();
  size_t keySize = ds.length();

  sha256.resetHMAC(key, keySize);
  sha256.update((const byte *)signcontent.c_str(), signcontent.length());
  sha256.finalizeHMAC(key, keySize, hashCode, sizeof(hashCode));

  String sign = "";
  for (byte i = 0; i < SHA256HMAC_SIZE; ++i)
  {
    sign += "0123456789ABCDEF"[hashCode[i] >> 4];
    sign += "0123456789ABCDEF"[hashCode[i] & 0xf];
  }

  return sign;
}

static String mqttBroker;
static String mqttClientID;
static String mqttUserName;
static String mqttPassword;

// call this function once
void mqtt_prepare(const char *timestamp,const char *productKey, const char *deviceName,const char *deviceSecret,const char *region)
{
  mqttBroker = productKey;
  mqttBroker += ".iot-as-mqtt.";
  mqttBroker += String(region);
  mqttBroker += ".aliyuncs.com";
  
  // Serial.println(mqttBroker);

  mqttUserName = deviceName;
  mqttUserName += '&';
  mqttUserName += productKey;
   //Serial.println(mqttUserName);
   
  mqttClientID = deviceName; // device name used as client ID
  mqttClientID += "|securemode=3,signmethod=hmacsha256,timestamp=";
  mqttClientID += timestamp;
  mqttClientID += '|';
   //Serial.println(mqttClientID);
}

bool connect_aliyun_mqtt_With_password(PubSubClient &mqttClient, const char *password)
{
  mqttClient.setServer(mqttBroker.c_str(), MQTT_PORT);

  byte mqttConnectTryCnt = 5;
  while (!mqttClient.connected() && mqttConnectTryCnt > 0)
  {
    //Serial.println("Connecting to MQTT Server ...");
    if (mqttClient.connect(mqttClientID.c_str(), mqttUserName.c_str(), password))
    {

      // Serial.println("MQTT Connected!");
      return true;
    }
    else
    {
      byte errCode = mqttClient.state();
      //Serial.print("MQTT connect failed, error code:");
      //Serial.println(errCode);
      if (errCode == MQTT_CONNECT_BAD_PROTOCOL || errCode == MQTT_CONNECT_BAD_CLIENT_ID || errCode == MQTT_CONNECT_BAD_CREDENTIALS || errCode == MQTT_CONNECT_UNAUTHORIZED)
      {
        //Serial.println("No need to try again.");
        break; // No need to try again for these situation
      }
      delay(3000);
    }
    mqttConnectTryCnt -= 1;
  }

  return false;
}

bool connect_aliyun_mqtt(
    PubSubClient &mqttClient,
    const char *productKey,
    const char *deviceName,
    const char *deviceSecret,
    const char *region)
{
  String timestamp = String(millis());
  mqtt_prepare(timestamp.c_str(), productKey, deviceName, deviceSecret, region);

  // Generate MQTT Password, use deviceName as clientID
  String signcontent = "clientId";
  signcontent += deviceName;
  signcontent += "deviceName";
  signcontent += deviceName;
  signcontent += "productKey";
  signcontent += productKey;
  signcontent += "timestamp";
  signcontent += timestamp;

  String mqttPassword = hmac256(signcontent, deviceSecret);

   //Serial.print("HMAC256 data: ");
   //Serial.println(signcontent);
   //Serial.print("HMAC256 key: ");
  // Serial.println(deviceSecret);
  // Serial.println(mqttPassword);

  return connect_aliyun_mqtt_With_password(mqttClient, mqttPassword.c_str());
}