Nodemcu does not connect to phone wifi

Question

All welcome.

I'm trying to connect nodemcu to the phone's wifi.

And nodemcu can't do it. But sometimes after several reboots she does it. Also if i use my old phone - nodemcu connects perfectly! Why?

My "new" phone: Fly FS504 Cirrus 2

My old phone: Fly IQ4504 Quad.

My code:

#include <ESP8266WiFi.h>

const char *ssid =  "Just my SSID";     

const char *pass =  "Some password";

WiFiClient client;

void setup() 
{
       Serial.begin(9600);
       delay(10);

       Serial.println("Connecting to ");
       Serial.println(ssid); 

       WiFi.begin(ssid, pass); 
       while (WiFi.status() != WL_CONNECTED) 
          {
            // stack here (only with new phone)
            delay(500);
            Serial.print(".");
          }
      Serial.println("");
      Serial.println("WiFi connected"); 
}

void loop() 
{      

}

Answer 1

From my experience the esp8266's wifi is a little bit buggy sometimes. I'm not sure if it has something to do with the esp auto-connecting to known networks, but I managed to work-around this issue by explicitly WiFi.disconnect()ing from any potential network right before calling WiFi.begin().

Another thing that I noticed several times is that the esp can be easily disturbed when connected to a breadboard, in special when wifi is in use (in this case the esp might even crash). There must be some bad interferences, I guess.