Blynk not connecting to server if during start-setup time not have wifi connection

[Kamran]

Hi,

I dont know it is bug or i am something doing wrong, i relase that BLYNK not connecting to server if during start time not have wifi connection (like all power restarted and arduino started before wifi not ready) .
Blynk.run () command not connecting server and serial monitor wrote about failing connect wifi.

I have waited more than one hour, when I saw that it was not connected to the server, I turned the arduino off and on. After that arduino joined the sever.

Maybe in such cases blynk.begin settings should be re-entered on the loop controlled functions?

[PeteKnight]

@Kamran

Maybe in such cases blynk.begin settings should be re-entered on the loop controlled functions?

You’d be better managing your WiFi connection yourself, with appropriate WiFi connection checking via a timer (not in the void loop), then using Blynk.config and Blynk.connect.

Pete.

[Kamran]

Dear Pete,
Thanks for answering.
I will try use while blynk connection not available function inside setup with timer reconnection again.

[Kamran]

Inside setup function :
(I am using #include <BlynkSimpleShieldEsp8266.h> library, so i dont find wifi check function, i use just Blynk.connected() command.

       while (!Blynk.connected())
             {
                 timer.setInterval(7000L,ConnectServerAgain); 
             }

And
this function for reconnection to server till succesful connection

 void  ConnectServerAgain() 
  {
    Blynk.begin(auth, wifi, ssid, pass);
    
    }

[PeteKnight]

That’s not the way I’d do it.
Have you tested this fully is a variety of different scenarios?

Pete.

[Kamran]

You are right, it is not checking that function.

/ _ )/ /_ _____ / /__
/ _ / / // / _ / '/
///_, /////_
/__/ v1.1.0 on Arduino Mega

#StandWithUkraine https://bit.ly/swua

[521] Connecting to xxxx
[3569] WIFI DISCONNECT
AT version:1.1.0.0(May 11 2016 18:09:56)
SDK version:1.5.4(baaeaebb)
compile time:May 20 2016 15:08:19
OK
[13611] Failed to connect WiFi

[PeteKnight]

That’s because Blynk.begin is a blocking function and will halt all code execution at that point if a connection to WiFi or the Blynk server can’t be established.

That’s why is said…

@PeteKnight

You’d be better managing your WiFi connection yourself, with appropriate WiFi connection checking via a timer (not in the void loop), then using Blynk.config and Blynk.connect.

Pete.

[Kamran]

Dear Pete,

Have wifi check function for BlynkSimpleShieldEsp8266.h library ?
Inside library (https://github.com/blynkkk/blynk-library/blob/master/src/BlynkSimpleShieldEsp8266.h) already tested “connectWiFi” , “BlynkWifi” , “wifi”, “WiFi.status()” and all give error.

[PeteKnight]

How are you testing these functions?

Where is your sketch?

How is this connected with the fact that Blynk.begin is a blocking function for all board types?

Pete.

[Kamran]

@PeteKnight

that Blynk.begin is a blocking

I have turned off wifi router from power supply and started arduino to check connection
Code:

#define BLYNK_TEMPLATE_ID "xxxxxxxx"
#define BLYNK_DEVICE_NAME "xxxxxxxxxxx"
#define BLYNK_AUTH_TOKEN "xxxxxxxxxxx"

// Send Blynk user messages to the hardware serial port…
#define BLYNK_PRINT Serial 

//blynk library
#include <ESP8266_Lib.h>
#include <BlynkSimpleShieldEsp8266.h>

//blynk auth
char auth[] = BLYNK_AUTH_TOKEN;

// wifi password, login
char ssid[] = "xxxx";
char pass[] = "xxxxx";


// Define your ESP8266 baud rate:
#define ESP8266_BAUD 115200

// Tell the Blynk library to use the  Hardware Serial port 1 for WiFi..
ESP8266 wifi(&Serial3);

BlynkTimer timer;

void setup() 

{

   
   // Initialise the debug serial port
      Serial.begin(115200);

   // Initialise the Hardware serial1 port…
      Serial3.begin(ESP8266_BAUD);
      delay(10);
      Blynk.begin(auth, wifi, ssid, pass);
      while ( !Blynk.connected())
            {
                timer.setInterval(7000L,ConnectServerAgain); 
            }
}

  void  ConnectServerAgain() 
 {
   Blynk.begin(auth, wifi, ssid, pass);
   Serial.println("reconnection to server");
   }

And on the Serial monitor i dont see any reconnection to server comments, mean that it is freeze somewhere.

[PeteKnight]

Where is your void loop?

Pete.

[Kamran]

Sorry,

void loop() 
{

  Blynk.run();
  timer.run();
}

[PeteKnight]

@Kamran

And on the Serial monitor i dont see any reconnection to server comments, mean that it is freeze somewhere.

You don’t seem to understand the concept of a blocking function.

@PeteKnight

Blynk.begin is a blocking function and will halt all code execution at that point if a connection to WiFi or the Blynk server can’t be established.

Pete.

[Kamran]

On some topic adviced to add Wifi.h library so i added, now i can check WiFi.status()

void setup() 

 {

    //Blink ve serial xeberlesme ucun 
    // Initialise the debug serial port
       Serial.begin(115200);

    // Initialise the Hardware serial1 port…
       Serial3.begin(ESP8266_BAUD);
       delay(10);
       WiFi.begin(ssid, pass);
      while (WiFi.status()!=WL_CONNECTED  )
             {
              delay(500);
              Serial.print(".");
                 timer.setInterval(2000L,ConnectServerAgain); 
             }

             
 if(WiFi.status()==WL_CONNECTED  ) 

 {
   Blynk.begin(auth, wifi, ssid, pass);
  }
}

   void  ConnectServerAgain() 
  {
    WiFi.begin(ssid, pass);
Serial.println("connection to wifi");
    delay(500);
    
    }

Blynk.config(auth) give error .
Upper codes not give any error but device not connection to wifi with this function (WiFi.begin(ssid, pass); , it is strange.

Serial monitor just show “…” comments

[Kamran]

Blynk.connectWiFi(ssid, pass); also not work
Serial monitor just continiously show
[510] Connecting to xxxx

[Kamran]

Dear Pete,

I’ve looked a little deeper, but there are errors that don’t match with the documentation.
@Gunner wrote in this topic how to solve it

Mega+ESP will freeze if there is a connection problem

Hello, I have a problem that is similar to furby_goulag. I have an Arduino Mega connected to an ESP-01 module. I have the wifi connection and Blynk working fine. Non-technical people will be using my device in various locations, on various wifi networks. I have a touch screen interface on the Arduino that allows the user to enter the ssid and password for whatever network they intend to use. This system works fine assuming: The user enters the ssid correctly The user enters the password …

char server[] = "blynk-cloud.com";
unsigned int port = 8080;

  wifi.setDHCP(1, 1, 1); //Enable dhcp in station mode and save in flash of esp8266
  Blynk.config(wifi, auth, server, port);
  if (Blynk.connectWiFi(ssid, pass)) {
    Blynk.connect();
  }

In my case (maybe blynk 2 version something changed) auth not taken

[23] 
    ___  __          __
   / _ )/ /_ _____  / /__
  / _  / / // / _ \/  '_/
 /____/_/\_, /_//_/_/\_\
        /___/ v1.1.0 on Arduino Mega

 #StandWithUkraine    https://bit.ly/swua


[534] Connecting to Ibadovlar
[3582] WIFI CONNECTED
AT version:1.1.0.0(May 11 2016 18:09:56)
SDK version:1.5.4(baaeaebb)
compile time:May 20 2016 15:08:19
OK
[8652] +CIFSR:STAIP,"192.168.1.7"
+CIFSR:STAMAC,"dc:4f:22:22:29:8d"
[8653] Connected to WiFi
[19844] Invalid auth token

Also, i have tried to delay before begin function, it is strange that after a while delay time begin function not working.

[PeteKnight]

@Kamran

blynk 2 version something changed

Yes, the server is now blynk.cloud and the port is 80

Pete.

[Kamran]

yes, i found it also from sketch generator.
Thanks

[PeteKnight]

You’d also be well advised to look at how the BlynkTimers are initialised in the Sketch Builder examples.

Pete.

[Kamran]

Tested, work normally for now )
Thanks for support

My code like this

  wifi.setDHCP(1, 1, 1); //Enable dhcp in station mode and save in flash of esp8266 - (i dont know what it is ) )))
    Blynk.config(wifi, auth, server, port);
  while (Blynk.connectWiFi(ssid, pass)==false) {
    delay(500);
    Serial.println("repeat checking");

  } 


  while (Blynk.connect() == false) {
    // Wait until connected
  }