在Arduino Uno R3中无法使用PubSubClient.h接收订阅的消息

Question

#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给蚊子，MongoDB和树莓派，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接收数据到所有其他客户端，但我无法接收Arduino中订阅主题的数据。但所有其他设备，如MongoDB，都能够从树莓派接收数据。我使用Arduino Uno R3, ESP8266-01设备和库来连接和发送/接收数据wifiespp .h, WiFiEspClient.h, WiFiEspUdp.h, SoftwareSerial.h, PubSubClient.hclient.subscribe("主题");返回1也实现了回调函数，但无法获得调用。

所以谁能帮助我为什么我没有得到订阅的主题消息在Arduino?

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

Answer 1

您正在使用的库在回调中有bug，因此您最好使用我喜欢的其他库https://github.com/vshymanskyy/TinyGSM该库包括SIM800(A,C,L,H,808)， SIM900(A,D,908,968)， ESP8266(安装在arduino上)，以太网屏蔽等几乎所有变体。它对我有效，因为同样的问题困扰了我近1-2周，但后来能够接收所有订阅的消息，无论通信模式(GSM，以太网，WiFi)