【MQTT学习之路】ESP8266 NodeMCU连接阿里云

1.修改以下例程中的参数，其中线上环境参数从小工具中获取

小工具网盘链接: https://pan.baidu.com/s/16qRsPle_oUXB6hIYFFWvXQ?pwd=9xtt 提取码: 9xtt

#include <ESP8266WiFi.h>
/* 依赖 PubSubClient 2.4.0 */
#include <PubSubClient.h>
/* 依赖 ArduinoJson 5.13.4 */
#include <ArduinoJson.h>
#define SENSOR_PIN
13
/* 连接您的WIFI SSID和密码 */
#define WIFI_SSID
"WIFI名称"
#define WIFI_PASSWD
"WIFI密码"
/* 设备的三元组信息*/
#define PRODUCT_KEY
"gwbmE0Kg1oZ"
#define DEVICE_NAME
"Esp8266_1"
#define DEVICE_SECRET
"5430a923098af6223e6f650f382d266f"
/* 线上环境域名和端口号，从小工具中获取 */
#define MQTT_SERVER
"gwbmE0Kg1oZ.iot-as-mqtt.cn-shanghai.aliyuncs.com"
#define MQTT_PORT
1883
#define MQTT_USRNAME
"Esp8266_1&gwbmE0Kg1oZ"
#define CLIENT_ID
"123456|securemode=3,signmethod=hmacsha1|"
#define MQTT_PASSWD
"40FE77BA140AFC32A62D503395C2502C40FDD189"
#define ALINK_BODY_FORMAT
"{"id":"123","version":"1.0","method":"thing.event.property.post","params":%s}"
#define ALINK_TOPIC_PROP_POST
"/sys/" PRODUCT_KEY "/" DEVICE_NAME "/thing/event/property/post"
unsigned long lastMs = 0;
WiFiClient espClient;
PubSubClient
client(espClient);
void callback(char *topic, byte *payload, unsigned int length)
{
Serial.print("Message arrived [");
Serial.print(topic);
Serial.print("] ");
payload[length] = '';
Serial.println((char *)payload);
}
void wifiInit()
{
WiFi.mode(WIFI_STA);
WiFi.begin(WIFI_SSID, WIFI_PASSWD);
while (WiFi.status() != WL_CONNECTED)
{
delay(1000);
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);
}
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 mqttIntervalPost()
{
char param[32];
char jsonBuf[128];
sprintf(param, "{"idle":%d}", digitalRead(13));
sprintf(jsonBuf, ALINK_BODY_FORMAT, param);
Serial.println(jsonBuf);
boolean d = client.publish(ALINK_TOPIC_PROP_POST, jsonBuf);
Serial.print("publish:0 失败;1成功");
Serial.println(d);
}
void setup()
{
pinMode(SENSOR_PIN,
INPUT);
pinMode(LED_BUILTIN, OUTPUT);
// 设置板上LED引脚为输出模式
digitalWrite(LED_BUILTIN, HIGH);
// 启动后关闭板上LED
/* initialize serial for debugging */
Serial.begin(9600);
Serial.println("Demo Start");
wifiInit();
}
// the loop function runs over and over again forever
void loop()
{
if (millis() - lastMs >= 5000)
{
lastMs = millis();
mqttCheckConnect();
/* 上报 */
mqttIntervalPost();
}
client.loop();
if (digitalRead(SENSOR_PIN) == HIGH){
Serial.println("Motion detected!");
delay(2000);
}
else {
Serial.println("Motion absent!");
delay(2000);
}
}

2.顺利编译后发现无法与阿里云建立通讯，错误如下

3.之后发现需要改“PubSubClient.h”中的参数

这个头文件路径一般在Arduino的libraries下

C:UsersAdministratorDocumentsArduinolibrariesPubSubClientsrcPubSubClient.h

改成这样重新上传就可以了

4.成功连接 

最后

以上就是勤奋流沙为你收集整理的【MQTT学习之路】ESP8266 NodeMCU连接阿里云的全部内容，希望文章能够帮你解决【MQTT学习之路】ESP8266 NodeMCU连接阿里云所遇到的程序开发问题。

如果觉得靠谱客网站的内容还不错，欢迎将靠谱客网站推荐给程序员好友。