Break blynk.run loop if internet is not available

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That is expected behavior because original Blynk.run() is a blocking call.

You can try this sketch, based on yours, using non-blocking Blynk_WM to see how to solve the issue. This sketch has been tested and working OK, with or w/o Blynk / Internet.

#ifndef ESP8266
#error This code is intended to run on the ESP8266 platform! Please check your Tools->Board setting.
#endif

#define BLYNK_PRINT Serial
#include <ESP8266WiFi.h>

// Not use #define USE_SPIFFS  => using EEPROM for configuration data in WiFiManager
// #define USE_SPIFFS    false => using EEPROM for configuration data in WiFiManager
// #define USE_SPIFFS    true  => using SPIFFS for configuration data in WiFiManager
// Be sure to define USE_SPIFFS before #include <BlynkSimpleEsp8266_WM.h>

#define USE_SPIFFS                  true

// Force some params in Blynk, only valid for library version 1.0.1 and later
#define TIMEOUT_RECONNECT_WIFI                    10000L
#define RESET_IF_CONFIG_TIMEOUT                   true
#define CONFIG_TIMEOUT_RETRYTIMES_BEFORE_RESET    5
// Those above #define's must be placed before #include <BlynkSimpleEsp8266_WM.h>

#include <BlynkSimpleEsp8266_WM.h>    //https://github.com/khoih-prog/Blynk_WM

#include <DNSServer.h>
#include <ESP8266WebServer.h>

#include <Ticker.h>

#define HTTP_PORT       80

WiFiClient client;
WiFiServer server(HTTP_PORT);

String  command = ""; // Command received from Android device

// Set Relay Pins
#define    RELAY1_PIN    D0

Ticker relay_ticker;

#define PROGRAM_DEBUG       true

void set_relay(byte status) 
{ 
  digitalWrite(RELAY1_PIN, status); 
}

#define RELAY_CLICK_TIME_MS      400

void click_relay() 
{
  set_relay(HIGH);
  relay_ticker.once_ms(RELAY_CLICK_TIME_MS, set_relay, (byte) LOW);
} 

/* check command received from Android Device */
String checkClient (void)
{
  while (!client.available()) 
    delay(1);
    
  String request = client.readStringUntil('\r');
  request.remove(0, 5);
  request.remove(request.length()-9,9);
  return request;
}

/* send command echo back to android device */
void sendBackEcho(String echo)
{
  client.println("HTTP/1.1 200 OK");
  client.println("Content-Type: text/html");
  client.println("");
  client.println("<!DOCTYPE HTML>");
  client.println("<html>");
  client.println(echo);
  client.println("</html>");
  client.stop();
  delay(1);
}

// Blynk PushButton
BLYNK_WRITE(V1)
{ 
  if (param.asInt())
  {
    #if (PROGRAM_DEBUG)
      Serial.println("Gate Open/Close by Blynk Button");
    #endif
    
    click_relay();
  }  
}

void WebServerHandle(void)
{
  client = server.available();
  
  if (!client) 
    return;
    
  command = checkClient();
  
  Serial.println(command);
  
  if (command == "r1on" || command == "on" || command == "open" )
  {
    #if (PROGRAM_DEBUG)
      Serial.println("Gate Open");
    #endif
    
    click_relay();
    sendBackEcho(command);// send command echo back to android device
  }
  else if (command == "r1off" || command == "off" || command == "close")
  {
    #if (PROGRAM_DEBUG)
      Serial.println("Gate Close");
    #endif
    click_relay();
    sendBackEcho(command);// send command echo back to android device
  }
  
  command = "";
}

void setup()
{
  pinMode(RELAY1_PIN, OUTPUT); 
  digitalWrite(RELAY1_PIN, LOW);
  
  Serial.begin(115200);
  Serial.println("\nStarting GateController-Server");
 
  Blynk.begin("GateController-Server"); 
  server.begin();
}

void loop()
{
  Blynk.run();
  WebServerHandle();
}

You certainly have to install Blynk_WM library from Arduino IDE Library Manager.

Some improvements have been made such as :

  1. Use Ticker to eliminate using unwanted delay() in loop()
  2. Remove all unnecessary functions, etc.
  3. Remove unnecessary OnDemand HotSpot as new Blynk.run will reconnect / start config portal if necessary.
  4. Making it easier to read, easier to reconfigure by not using hardcoding if possible

You can add more and more functions later as needed.

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