ESP8266 MQTT模板

最新推荐文章于 2025-05-28 23:25:44 发布

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最新推荐文章于 2025-05-28 23:25:44 发布 · 743 阅读

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CC 4.0 BY-SA版权

文章标签：

#ESP8266 #IoT #NodeMCU

MQTT模板

一个好的模板将极大的提高编程效率

传感器发送数据

以超声波为例

#include <ESP8266WiFi.h>
#include <PubSubClient.h>
#include <string.h>
#include <SoftwareSerial.h>
#include <ArduinoJson.h>
#include <SPI.h> // Only needed for Arduino 1.6.5 and earlier

//Wifi Configuration
#define MQTT_VERSION MQTT_VERSION_3_1_1
const char* WIFI_SSID = "wifi ssid";
const char* WIFI_PASSWORD = "wifi password";
const PROGMEM char* MQTT_PUBLISH_TOPIC = "topic";
const PROGMEM char* MQTT_CLIENT_ID = "client id";
const PROGMEM char* MQTT_SERVER_IP = "IP";
const PROGMEM uint16_t MQTT_SERVER_PORT = port;
const PROGMEM char* MQTT_USER = "user";
const PROGMEM char* MQTT_PASSWORD = "password";

unsigned int HighLen = 0;
unsigned int LowLen  = 0;
unsigned int Len_mm  = 0;

SoftwareSerial us100(D1,D2);//Rx,Tx
WiFiClient wifiClient;
PubSubClient client(wifiClient);

void callback(char* p_topic, byte* p_payload, unsigned int p_length) {

  // concat the payload into a string
  String payload;
  for (uint8_t i = 0; i < p_length; i++) {
    payload.concat((char)p_payload[i]);
  }

}

void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("INFO: Attempting MQTT connection...");
    // Attempt to connect
    if (client.connect(MQTT_CLIENT_ID, MQTT_USER, MQTT_PASSWORD)) {