Google iot MQTT-ESP32首次连接，仅在30m后重新连接 [英] Google iot MQTT - ESP32 Connects the first time and only reconnects after 30m

问题描述

我正在使用带有ESP32的google Iot cloud，我发送虚假值只是为了使用MQTT数据PUB/SUB进行测试，显然我已经成功发布了这些值，有时，我无法重新连接到谷歌物联网 我不知道为什么它会一直检查wifi ...发布并且不检查JWT密钥.

我注意到，如果我一次连接到Google IoT，然后从我的PC上拔下esp32(断开电源)，然后再次插回并尝试连接，我将在此检查wifi"中输入大约30m，直到我可以重新连接到Google物联网.如何解决这个问题?

我相信有一些可以解决的问题:

I'm working with google Iot cloud with ESP32, I am sending fake values just to make a test with the MQTT data PUB/SUB, Apparently I'm succeeding in publishing the values, sometimes, I can't reconnect to google iot. I don't know why it keeps checking wifi...publising and doest check for the JWT key.

I have noticed that if I connect once to the google iot and then I unplug the esp32 from my pc (disconnect no power), and plug it back again and try to connect, I will enter in this "checking wifi" for about 30m, until I can connect back to google iot. How can fix this?

I beleived there was something to deal with this:

// Time (seconds) to expire token += 20 minutes for drift
const int jwt_exp_secs = 3600; // Maximum 24H (3600*24)

当我设法收到将信息发送到服务器的良好响应时，我得到以下信息:

When I manage to get a good response that send info to the servers, i get this+:

entry 0x400806b8
Setup.....
Starting wifi
Connecting to WiFi
Connected
Waiting on time sync...
checking wifi...
connecting...Refreshing JWT
connected

Library connected!
incoming: /devices/esp32-device/config - 
incoming: /devices/esp32-device/config - 
Publishing value
Publishing value
Publishing value
Publishing value
Publishing value

有时候，在使用相同代码的情况下，我会在30m左右收到较差的响应，似乎正在发送恒定数据，该数据不应该是恒定的.(未发生):

There is times that I get a bad response for about 30m, using the same code, it seems to be sending constant data, which shouldn't be constant.(wasn't suppose to happen):

ho 0 tail 12 room 4
load:0x40080400,len:6352
entry 0x400806b8
Setup.....
Starting wifi
Connecting to WiFi
Connected
Waiting on time sync...
checking wifi...Publishing value
checking wifi...checking wifi...checking wifi...Publishing value
(Just keeps repeating)

这是与MQTT代码的主要连接，试图解决问题，但没有成功:

This is the main connection to MQTT code, with the attempts to fix problems, but didn't work:

// This file contains static methods for API requests using Wifi / MQTT
#ifndef __ESP32_MQTT_H__
#define __ESP32_MQTT_H__
#include <Client.h>
#include <WiFi.h>
#include <WiFiClientSecure.h>
#include <MQTT.h>
#include <CloudIoTCore.h> 
#include <CloudIoTCoreMqtt.h>
#include "ciotc_config.h" // Update this file with your configuration

void messageReceived(String &topic, String &payload) {
Serial.println("incoming: " + topic + " - " + payload);
}


// Initialize WiFi and MQTT for this board
Client *netClient;
CloudIoTCoreDevice *device;
CloudIoTCoreMqtt *mqtt;
MQTTClient *mqttClient;
unsigned long iat = 0;
String jwt;

String getDefaultSensor() {
return  "Wifi: " + String(WiFi.RSSI()) + "db";
}

String getJwt() {
Serial.println("Entered JWT");
delay(5000);
iat = time(nullptr);
Serial.println("Refreshing JWT");
jwt = device->createJWT(iat, jwt_exp_secs);
return jwt;
}

void setupWifi() { 
Serial.println("Starting wifi");

Serial.print("WIFI status = ");
Serial.println(WiFi.getMode());
WiFi.disconnect(true);
delay(3000);
WiFi.mode(WIFI_STA);
delay(3000);
Serial.print("WIFI status = ");
Serial.println(WiFi.getMode());

WiFi.begin(ssid, password);
Serial.println("Connecting to WiFi");
while (WiFi.status() != WL_CONNECTED) {
  delay(100);
 }
Serial.println("Connected");
delay(5000);

configTime(0, 0, ntp_primary, ntp_secondary);
Serial.println("Waiting on time sync...");
while (time(nullptr) < 1510644967) {
  delay(10);
}
}


void connectWifi() {
Serial.print("checking wifi...");
while (WiFi.status() != WL_CONNECTED) {
 Serial.print(".");
}
delay(5000);
}


bool publishTelemetry(String data) {
return mqtt->publishTelemetry(data);
}

 bool publishTelemetry(const char* data, int length) {
 return mqtt->publishTelemetry(data, length);
 }

 bool publishTelemetry(String subfolder, String data) {
 return mqtt->publishTelemetry(subfolder, data);
 } 

 bool publishTelemetry(String subfolder, const char* data, int length) {
 return mqtt->publishTelemetry(subfolder, data, length);
 }

 void connect() {
 connectWifi();
  mqtt->mqttConnect();

  delay(5000);
 }

 void setupCloudIoT() {
 device = new CloudIoTCoreDevice(
  project_id, location, registry_id, device_id,
  private_key_str);

 setupWifi();
 netClient = new WiFiClientSecure();
 mqttClient = new MQTTClient(512);
 mqttClient->setOptions(180, true, 1000); // keepAlive, cleanSession, timeout
 mqtt = new CloudIoTCoreMqtt(mqttClient, netClient, device);
 mqtt->setUseLts(true);
 mqtt->startMQTT();

 delay(5000);
 }
 #endif //__ESP32_MQTT_H__

这是main.cpp:

This is the main.cpp:

#include <Arduino.h>
#include <WiFiClientSecure.h>
#include "esp32-mqtt.h"
#include <ArduinoJson.h>
#define led 14

char buffer[100];
float counter = 0;
float counter1 = 0;

void setup() {
Serial.begin(115200);

Serial.println("Setup.....");
pinMode(led, OUTPUT);

setupCloudIoT();
}

unsigned long lastMillis = 0;

void loop() {
mqtt->loop();
delay(10);  // <- fixes some issues with WiFi stability

if (!mqttClient->connected()) {
connect();
}

counter++;
counter1++;

if (millis() - lastMillis > 1000) {
Serial.println("Publishing value");
lastMillis = millis();
float temp = counter;
float hum = counter1;
StaticJsonDocument<100> doc;
doc["temp"] = temp;
doc["humidity"] = hum;
serializeJson(doc, buffer);
publishTelemetry(buffer);
}
}

有人知道是否还有其他模块没有这个问题?

推荐答案

您面临的问题是恕我直言，这不是您的代码或所使用的MQTT-lib的问题. ESP32核心封装似乎存在问题(1.04仍然存在).请参阅github上的问题集以及一些建议的解决方法，这些方法最终会延迟问题，但无法解决.
MQTT问题从2018年至今收集的问题
这些是尚未解决的问题关于WiFi重新连接问题
一个引发错误的测试案例是从以下其中一个链接的:
我用于识别ESP32特定问题的方法与带有MQTT连接的esp8266上的相同程序相同，并且运行了几个月.关闭它们.因此，我只是引用了未解决的问题，如果您搜索已解决的问题，您会发现更多)是由过时的bot而不是由解决方案解决的！

The issue you face is IMHO not a problem of your code or the MQTT-lib you use. There seems to be a problem in the ESP32 core package (1.04 has it still). See this collection of issues from github and some proposed work around, which in the end delay the problem but do not solve it.
Issue with MQTT collection of problems from 2018 till today
These are open issues regarding WiFi re/connection problems
A test case for provoking an error is linked from one of the post.
I use for identifying ESP32 specific problems the identical programm on an esp8266 with MQTT connection and there it runs for months.
The ESP32 people have the bad habit to leave issues uncommented open for month hopeing the stale bot closes them. So I just cited the open issues, if you search for closed issues you'll find some more) closed by stale bot and not by solution!

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