Relay Switch (Phyisical button and Widget) - working without internet

Need Help With My Project
4

You have to apply both advices

  1. @PeteKnight to avoid being blocked when starting the system without WiFi/Internet/Blynk
  2. @Blynk_Coeur to avoid being blocked while being in the loop and being able to reconnect to WiFi/Blynk when WiFi/Internet connection reestablished

But you also have to further isolate the code in checkPhysicalButton() from Blynk by calling Blynk.virtualWrite() only when Blynk is connected. You also can use millis() instead of BlynkTimer to check to know when to call checkPhysicalButton()

void checkPhysicalButton()
{
  if (digitalRead(PUSH_BUTTON_1) == LOW) {
    // pushButton1State is used to avoid sequential toggles
    if (pushButton1State != LOW) {

      // Toggle Relay state
      relay1State = !relay1State;
      digitalWrite(RELAY_PIN_1, relay1State);

      // Update Button Widget
      if (Blynk.connected())
         Blynk.virtualWrite(VPIN_BUTTON_1, relay1State);
    }
    pushButton1State = LOW;
  } else {
    pushButton1State = HIGH;
  }

  if (digitalRead(PUSH_BUTTON_2) == LOW) {
    // pushButton2State is used to avoid sequential toggles
    if (pushButton2State != LOW) {

      // Toggle Relay state
      relay2State = !relay2State;
      digitalWrite(RELAY_PIN_2, relay2State);

      // Update Button Widget
      if (Blynk.connected())
        Blynk.virtualWrite(VPIN_BUTTON_2, relay2State);
    }
    pushButton2State = LOW;
  } else {
    pushButton2State = HIGH;
  }

  if (digitalRead(PUSH_BUTTON_3) == LOW) {
    // pushButton3State is used to avoid sequential toggles
    if (pushButton3State != LOW) {

      // Toggle Relay state
      relay3State = !relay3State;
      digitalWrite(RELAY_PIN_3, relay3State);

      // Update Button Widget
      if (Blynk.connected())
        Blynk.virtualWrite(VPIN_BUTTON_3, relay3State);
    }
    pushButton3State = LOW;
  } else {
    pushButton3State = HIGH;
  }

  if (digitalRead(PUSH_BUTTON_4) == LOW) {
    // pushButton4State is used to avoid sequential toggles
    if (pushButton4State != LOW) {

      // Toggle Relay state
      relay4State = !relay4State;
      digitalWrite(RELAY_PIN_4, relay4State);

      // Update Button Widget
      if (Blynk.connected())
        Blynk.virtualWrite(VPIN_BUTTON_4, relay4State);
    }
    pushButton4State = LOW;
  } else {
    pushButton4State = HIGH;
  }
}

If you’d like, you can try Blynk_WM library solution to solve the similar issue here

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