How to run the program when Blynk not connect to WIFI and resume connectivity when Blynk back online?

Need Help With My Project
1

Hi everyone I’m new to Blynk and I want to track the Blynk WIFI connection when it is offline. I want it to still do something when it is offline but based on my code when “internet = 0” (in the void loop) it kinda freezes and I can’t run the offline code inside that condition. I’ve been researching for a while on how to do this but I didn’t seem to find any solution. I use Blynk Edgent by the way.

Here is my code:

//#define BLYNK_TEMPLATE_ID           "TMPxxxxxx"
//#define BLYNK_TEMPLATE_NAME         "Device"

#define BLYNK_FIRMWARE_VERSION "0.1.0"

#define BLYNK_PRINT Serial
//#define BLYNK_DEBUG

#define APP_DEBUG

#include "BlynkEdgent.h"

int internet = 0;

const int btn1 = 2;   
const int btn2 = 3;   

const int relay1_pin = 12;
const int relay2_pin = 13;

int relay1State = LOW;
int relay2State = LOW;

void checkConnection() {

  bool isConnected = Blynk.connected();
  if (isConnected == false) {
    internet = 0;
    Serial.println("Blynk Not Connected");
  }
  if (isConnected == true) {
    internet = 1;
    Serial.println("Blynk Connected");
  }
}

BLYNK_WRITE(V0) {
  relay1State = param.asInt();
  digitalWrite(relay1_pin, !relay1State);
}

BLYNK_WRITE(V1) {
  relay2State = param.asInt();
  digitalWrite(relay2_pin, !relay2State);
}

BLYNK_CONNECTED() {
  Blynk.syncVirtual(V0, V1);
}

void setup() {
  delay(1000);
  Serial.begin(115200);

  pinMode(relay1_pin, OUTPUT);
  pinMode(relay2_pin, OUTPUT);

  // Turn off relay
  digitalWrite(relay1_pin, HIGH);
  digitalWrite(relay2_pin, HIGH);

  BlynkEdgent.begin();
  timer.setInterval(2000L, checkConnection);
}

void loop() {
  BlynkEdgent.run();
  timer.run();

  // check if there is wifi connection
  if (internet != 1) {
    Serial.println("Connection failed!");
    // run offline operation
    // turn on/off relay with physicle button
  } else {
    Serial.println("Connection OK!");
  }
}
2

You’re going to have to re-work the Edgent example sketch quite a bit if you want to handle off-line functionality.
Is there any reason why you’re using the Edgent example rather than a regular static provisioning Blynk example?

Pete.

3

Thanks, Pete. I don’t think I know how to customize the Edgent sketch for this functionality. I think Edgent example let you config wifi network later on the app rather than include wifi name and password in the code and OTA too?

4

That’s my point - it’s a very complex sketch and isn’t a good starting point t for what you want to achieve.

Yes, the Edgent example allows dynamic provisioning of WiFi credentials.
There is a way to use Blynk.Air OTA without using Edgent though.

Pete.

5

Dynamic provisioning is a good feature to have but seems like I can’t achieve both of these functionalities, either have offline function or dynamic provisioning.

6

No, I’m not saying that, just that the Edgent sketch is very complex and you’ll need to to ensure that you understand it before you start making changes.

Pete.