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Order of execution of the blynk functions at startup

#1

Hello,
I’d like to understand the order of execution of the blynk functions at startup .
for example this simplified sketch:

void setup()
{
  Serial.begin(9600);
  Blynk.begin(auth, server_ip, 8080, arduino_ip, dns_ip, gateway_ip, subnet_mask, arduino_mac);

//other setup: GPIO, Functions...
}


BLYNK_CONNECTED() {  //update the values }

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

What is the correct order?

1-blynk begin function,
2-BLYNK_CONNECTED() function
3- //other setup: GPIO, Functions…

or

1-blynk begin function,
2-//other setup: GPIO, Functions…
3-BLYNK_CONNECTED() function

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#2

its a good question, and it can be answered by placing Serial.println(); commands
in setup() and BLYNK_CONNECTED(); and see what order they occur.

My guess is the latter… i.e. during Blynk.run()

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#3

Setup runs first and only once.

loop runs all the time but not untill after setup has completed.

blynk_connected only runs once when loop is running and the app gets connected.

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#4

I just tried this bit of code:

void setup()
{
  Serial.begin(57600);
  Serial.println("about to do Blynk.begin");
  Blynk.begin(auth, ssid, pass);
  // <------------------------------------------------BLYNK_CONNECTED executes here
  Serial.println("Blynk.begin completed");
  delay(100);
  Serial.println("Void setup 1");
  delay(100);
  Serial.println("Void setup 2");
}


BLYNK_CONNECTED()
{
  Serial.println("Blynk Connected executed");
}

void loop()
{
  Serial.println("Void Loop, about to do Blynk.run");
  Blynk.run();
  Serial.println("Void Loop, Blynk.run completed");
}

which produces this output in the serial monitor:

about to do Blynk.begin
[5398] Connecting to UltraNet
[15901] Connected to WiFi
[15901] IP: 192.168.1.27
[15901] 
    ___  __          __
   / _ )/ /_ _____  / /__
  / _  / / // / _ \/  '_/
 /____/_/\_, /_//_/_/\_\
        /___/ v0.6.1 on ESP8266

[15914] Connecting to blynk-cloud.com:80
[16084] Ready (ping: 56ms).
Blynk Connected executed
Blynk.begin completed
Void setup 1
Void setup 2
Void Loop, about to do Blynk.run
Void Loop, Blynk.run completed
Void Loop, about to do Blynk.run
Void Loop, Blynk.run completed

This shows that BLYNK_CONNECTED is executed IMMEDIATELY after the device has connected to Blynk, before the any further lines of code in void setup.

So this means that:

is the correct answer.

Pete.

3 Likes

#5

Thanks!!!

1 Like