NodeMCU V3 ESP8266

WiFi Modes of Operation of ESP8266: There are three modes of WiFi Operation in the ESP8266 WiFi Module. Those are:

1. Station Mode (STA)
2. Soft Access Point (AP)
3. Soft AP + Station

Station Mode

Only Access Point

#include "ESP8266WiFi.h"

const char* ssid = "ChorkeOrg_2.4GHz";
const char* pass = "academia";

void setup(void) {
  pinMode(D4, OUTPUT);
  Serial.begin(115200);
  WiFi.begin(ssid, pass);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print("*");
  }

  Serial.println("");
  Serial.println("WiFi connection Successful");
  Serial.print("The IP Address of ESP8266 Module is: ");
  Serial.print(WiFi.localIP());
}

void loop() {
  digitalWrite(D4, LOW);
  delay(1000);
  digitalWrite(D4, HIGH);
  delay(1000);
}

Multi Access Point

#include <ESP8266WiFi.h>
#include <ESP8266WiFiMulti.h>

const char* ap0_ssid_24 = "ChorkeOrg";
const char* ap0_pasword = "chorke@bd/0A";
const char* ap0_ssid_50 = "ChorkeOrg_2.4GHz";

ESP8266WiFiMulti multi;

void setup(void) {
  pinMode(D4, OUTPUT);
  Serial.begin(115200);

  delay(10);
  Serial.println('\n');
  multi.addAP(ap0_ssid_24, ap0_pasword);
  multi.addAP(ap0_ssid_50, ap0_pasword);

  Serial.print("Connecting : ");
  while (multi.run() != WL_CONNECTED) {
    delay(500);
    Serial.print('>');
  }
  Serial.println('\n');
  Serial.print("Connected to: ");
  Serial.println(WiFi.SSID());
  Serial.print("IP address  : ");
  Serial.println(WiFi.localIP());
}

void loop() {
  digitalWrite(D4, LOW);
  delay(1000);
  digitalWrite(D4, HIGH);
  delay(1000);
}

Soft Access Point

#include "ESP8266WiFi.h"

const char* ssid = "ChorkeIot_2.4GHz";
const char* pass = "academia";

IPAddress local_IP(10, 19, 83, 10);
IPAddress subnet(255, 255, 255, 0);
IPAddress gateway(10, 19, 83, 1);

void setup(void) {
  pinMode(D4, OUTPUT);
  Serial.begin(115200);
  Serial.println();

  Serial.print("WNC Config: ");
  Serial.print(WiFi.softAPConfig(local_IP, gateway, subnet) ? "Ready" : "Failed!");

  Serial.println("SID Config: ");
  Serial.print(WiFi.softAP(ssid, pass) ? "Ready" : "Failed!");

  Serial.println("WAN Config: ");
  Serial.print(WiFi.softAPIP());
}

void loop() {
  digitalWrite(D4, LOW);
  delay(1000);
  digitalWrite(D4, HIGH);
  delay(1000);
}

References

Quick Start with NodeMCU V3 ESP8266 WiFi Modes Station Access Point Blynk Simple ESP8266 Header Arduino core for ESP8266 Connect ESP8266 to WiFi NodeMCU V3 ESP8266 Soft Access Point Class Blynk C++ Library Blynk Example Arduino IDE

Client-Server Wi-Fi Communication WiFi Connections ESB8266WiFi.h