esp32 dev board not connecting to wifi

ojosbourne
Posts: 3
Joined: Mon Aug 27, 2018 1:33 pm

esp32 dev board not connecting to wifi

Postby ojosbourne » Mon Aug 27, 2018 1:43 pm

i have an issue with my esp32 development board not connecting to wifi it just says connecting on the serial monnitor but never connects all the login details are correct.
the code has been hashed together from several sources however but was working

Code: Select all

 #include <Adafruit_Sensor.h>
//#include "DHT.h"
#include <WiFi.h>
#include <PubSubClient.h>
#include "SparkFunHTU21D.h"
//Create an instance of the object
HTU21D myHumidity;

const char* ssid = "skynet";
const char* password = "Sexyfrog9919";
const char* mqttServer = "192.168.0.196";
const int mqttPort = 1883;
const char* mqttUser = "ojosbourne";
const char* mqttPassword = "Skingsking9919";

#define temperature_topic "topic/temp"       //Topic temperature
#define humidity_topic "topic/humid"         //Topic humidity
//#define debug_topic "debug"                   //Topic for debugging


//here we use pin IO23 of ESP32 to read data
//#define DHTPIN 14
//our sensor is DHT22 type
//#define DHTTYPE DHT22
//create an instance of DHT sensor
//DHT dht(DHTPIN, DHTTYPE);

WiFiClient espClient;
PubSubClient client(espClient);


void setup() {
//void setup() (

//   connect to wifi 



Serial.begin(115200);
WiFi.begin(ssid, password);
 
while (WiFi.status() != WL_CONNECTED) {
delay(200);
Serial.println("Connecting to WiFi..");
}
 
Serial.println("Connected to the WiFi network");
 // connect to mqtt
 
client.setServer(mqttServer, mqttPort);
 
while (!client.connected()) {
Serial.println("Connecting to MQTT...");
 
if (client.connect("ESP32Client", mqttUser, mqttPassword )) {
 
Serial.println("connected");
 
} else {
 
Serial.print("failed with state ");
Serial.print(client.state());
delay(200);
 
}
//}

  
  //Serial.begin(115200);
  //Serial.println("DHT22 sensor!");
  //call begin to start sensor
  //dht.begin();

  Serial.println("HTU21D Example!");

  myHumidity.begin();
}

}
 



void loop() {

  float h = myHumidity.readHumidity();
  float t = myHumidity.readTemperature();

  
  //use the functions which are supplied by library.
  //float h = dht.readHumidity();
  // Read temperature as Celsius (the default)
  //float t = dht.readTemperature();
  // Check if any reads failed and exit early (to try again).
  if (isnan(h) || isnan(t)) {
    Serial.println("Failed to read from htu21d sensor!");
    return;
  }
  // print the result to Terminal
  //client.publish(humidity_topic, (h));
  Serial.print("Humidity: ");
  Serial.print(h);
  Serial.print(" %\t");
 // client.publish(temperature_topic, (t));
  Serial.print("Temperature: ");
  Serial.print(t);
  Serial.println(" *C ");

   // Publish values to MQTT topics
    client.publish(temperature_topic, String(t).c_str(), true);   // Publish temperature on mosohomes/temp1
    //if ( debug ) {    
      Serial.println("Temperature sent to MQTT.");
    //}
    delay(200); //some delay is needed for the mqtt server to accept the message
    
    client.publish(humidity_topic, String(h).c_str(), true);      // Publish humidity on mosohomes/humid1
    
    //if ( debug ) {
                  Serial.println("Humidity sent to MQTT.");
                 //}
  //we delay a little bit for next read
  delay(10000);
}

  

ojosbourne
Posts: 3
Joined: Mon Aug 27, 2018 1:33 pm

Re: esp32 dev board not connecting to wifi

Postby ojosbourne » Tue Aug 28, 2018 4:52 pm

i managed to fix it by changing while (WiFi.status() != WL_CONNECTED) {

to while (WiFi.status() == WL_CONNECTED) {

was driving me nuts i was looking at loads of code a noticed this was different in one of the sketches

boarchuz
Posts: 604
Joined: Tue Aug 21, 2018 5:28 am

Re: esp32 dev board not connecting to wifi

Postby boarchuz » Sun Sep 02, 2018 7:02 pm

Well that's a very... creative... solution. :lol:

How is that working out for you?

ArtemN
Posts: 13
Joined: Mon Sep 03, 2018 4:20 am

Re: esp32 dev board not connecting to wifi

Postby ArtemN » Mon Sep 03, 2018 4:58 am

Its a strange bug. newer version of esp tools led to problem with transaction for example in standart simplewifiserver.ino code! In old version all fine, but in last version client.stop() not end connection, then in second loop client.connected() = true, but client.available() = false... in this branche of code have no "break" for out from while ;) and program looped in infinity cycle for the moment when browser make a timeout and client.connected() be false.
It semed that there is another possibility to say browser that "connection end" not waitin browser timeout, but i novice in HTTP and have no idea yet.

ArtemN
Posts: 13
Joined: Mon Sep 03, 2018 4:20 am

Re: esp32 dev board not connecting to wifi

Postby ArtemN » Fri Jan 18, 2019 2:48 am

It seemed that wifi goto in sleep mode. I disable sleep mode after Wifi.begin() and all work fine!

void setup()
{
...
WiFi.begin(ssid, password);
WiFi.setSleep(false);// this code solves my problem
...
}

silgarth
Posts: 1
Joined: Mon Jul 22, 2019 11:51 pm

Re: esp32 dev board not connecting to wifi

Postby silgarth » Mon Jul 22, 2019 11:52 pm

I am seeing a similar issue, sometimes the Wifi will not connect even after several resets. And then it connects almost everytime. This is really unreliable, the Wifi code is running in the second core.

void wifiSetup()
{
xTaskCreatePinnedToCore(
wifiTask, /* Function to implement the task */
"Wifi Task", /* Name of the task */
10000, /* Stack size in words */
NULL, /* Task input parameter */
2, /* Priority of the task */
&wifiTaskHandle, /* Task handle. */
0); /* Core where the task should run */
}
void wifiSetupInternal() {

gWifiStatus = 1;
// Connect to WiFi network
Serial.println();
Serial.println();
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.mode(WIFI_STA);
esp_wifi_set_ps(WIFI_PS_NONE);
Serial.print("MAC: ");
Serial.println(WiFi.macAddress());
gmacAddr = WiFi.macAddress();
// commented out to allow WiFi to pick address
// WiFi.config(ip, gateway, netmask);
WiFi.begin(ssid, password);

while (WiFi.status() != WL_CONNECTED)
{
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0018,len:4
load:0x3fff001c,len:928
ho 0 tail 12 room 4
load:0x40078000,len:9280
load:0x40080400,len:5848
entry 0x40080698
34

Version: esp32 - version 1 2019-05-02 - test D



Connecting to TXTdev
MAC: 24:0A:C4:1D:5E:74
.........................

User avatar
HermannSW
Posts: 97
Joined: Fri Oct 27, 2017 6:58 am
Location: Eberbach, Germany
Contact:

Re: esp32 dev board not connecting to wifi

Postby HermannSW » Tue Jul 23, 2019 6:14 am

I noticed similar, whenever I flashed [F]CameraWebServer to ESP32-CAM module, or powered on the module, Wifi nearly never connects on first reset (with Serial Monitor started before), and almost always connects on second reset ...

mongoose
Posts: 2
Joined: Sun May 12, 2019 2:40 am

Re: esp32 dev board not connecting to wifi

Postby mongoose » Tue Sep 01, 2020 5:32 am

Please refer to this solution
https://arduino.stackexchange.com/a/77753

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