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#include "SPI.h"
#include “WiFiEsp.h”
#include  <WiFiEspClient.h>
#include “SoftwareSerial.h”
#include <PubSubClient.h>
#include <WiFiEspUdp.h>

float temp=0;
int tempPin = 0;
int isClientConnected = 0;

char data[80];
char ssid[] = “SSID”; // your network SSID (name)
char pass[] = “PASSWORD”; // your network password

int status = WL_IDLE_STATUS; // the Wifi radio’s status
char deviceName = “ArduinoClient1”;

IPAddress server(xxx,xxx,xxx,xxx); //MQTT server IP
IPAddress ip(192,168,43,200);

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("-");
}

// Emulate Serial1 on pins 6/7 if not present
WiFiEspClient espClient;
PubSubClient client(espClient);

SoftwareSerial Serial1(6,7); // RX, TX

void setup(){
    Serial.begin(9600);
    Serial1.begin(9600);
    WiFi.init(&Serial1);
    WiFi.config(ip);
    if (WiFi.status() == WL_NO_SHIELD) {
       Serial.println("WiFi shield not present");
       while (true);
    }

    while ( status != WL_CONNECTED) {
       Serial.print("Attemptingonnect to WPA SSID: ");
       Serial.println(ssid);
       status = WiFi.begin(ssid, pass);
       Serial.print("WiFius : ");
       Serial.println(status);
    }

    //connect to MQTT server
    client.setServer(server, 1883);
    client.setCallback(callback);
    isClientConnected = client.connect(deviceName);
    Serial.println("+++++++");
    Serial.print("isClientConnected;
    Serial.println(isClientConnected);
    Serial.print("client.state");
    Serial.println(client.state());

    if (isClientConnected) {
        Serial.println("Connected…..");
        client.publish("status","Welcome to ISG");
        client.subscribe("isg/demoPublish/rpi/ardTempWarn"); 
        //Not able to recieve for this subscribed topic on Arduino Uno Only if I   
        //print it returns 1

    }
}

void loop() {
    temp = (5.0 * analogRead(tempPin) * 100.0) / 1024;
    Serial.print(" temp : " );
    Serial.println(temp);
    Serial.print("client.connected);
    Serial.println(client.connected());
    if (!client.connected()) {
            reconnect();
    }
    client.publish("isg/demoPublish/ard1/tempLM35",String(temp).c_str()); 
    // able to receive data at other         
    // clients like RPI,Web using Mosquitto broker

    client.loop();
    delay(5000);
}

void reconnect() {
    Serial.println("Device is trying to connect to server ");
    while (!client.connected()) {
        if (client.connect(deviceName)) {
        } else {
            delay(5000);
        }
    }
}

我使用 Arduino Uno R3 和 ESP8266-01 作为 wifi 连接器。我必须读取温度数据并发送到 Mosquitto、MongoDB 和 Raspberry Pi 并接收特定条件下的数据，因为我在 Arduino 中订阅了一个主题。我能够从 Arduino 向所有其他客户接收数据，但我无法在 Arduino 中接收有关订阅主题的数据。但是像 MongoDB 这样的所有其他设备都能够从 Raspberry Pi 接收数据。我使用 Arduino Uno R3、ESP8266-01 设备和库来连接和发送/接收数据 WiFiEsp.h、WiFiEspClient.h、WiFiEspUdp.h、SoftwareSerial.h、PubSubClient.h client.subscribe("topic"); 返回 1 还实现了回调函数，但无法调用。

那么任何人都可以帮助我为什么我没有在 Arduino 中收到订阅的主题消息吗？

我已关注https://sonyarouje.com/2016/03/15/mqtt-communication-with-arduino-using-esp8266-esp-01/#comment-111773

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1 回答 1

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您正在使用的库在回调中有错误，因此最好使用其他库，我的偏好是 https://github.com/vshymanskyy/TinyGSM 这个库包括 SIM800 的几乎所有变体（A、C、L、 H,808)、SIM900(A,D,908,968) 的变体、ESP8266（安装在 arduino 上）、以太网屏蔽等。它对我有用，因为同样的问题困扰了我近 1-2 周，但后者能够接收所有订阅消息，与通信模式无关（GSM、以太网、WiFi）

于 2017-01-17T09:25:44.910 回答