Question about Blynk.connected()?

1

Hi

I write some code to send some information to Blynk , like

void update()
{
if (Blynk.connected())
{
send to Blynk;
}
}

But from the begin, when hardware bootup, before reach line Blynk.begin(), I see hardware send data to Blynk via that function, is this normal? I think from begining, value of Blynk.connected() must be false?

2

Once you have the basic setup correct like so:

void setup()
{
  Blynk.begin(auth);  // Here your Arduino connects to the Blynk Cloud.
  while (Blynk.connect() == false) {
    // do nothing but wait
  }
}

void loop()
{
  Blynk.run(); // All the Blynk Magic happens here...
}

then you just need to make a Blynk.virtualWrite(); call to “send data” to blynk.

1 Like
3

Hi

I know that, but in my case, that function used to send data to Blynk called inside another function, something like

{
  do sth;
  update();
}```

function() called from setup(), before Blynk.connect(), normal logic in this time, hardware is not connected to server yet, but hardware still send data to Blynk, it's not a big problem, but I think that maybe an some kind of error
4

Why are you putting functions in setup? That’s not a good practice unless you are making a battery operated sensor.

You would be best to connect the hardware, then perform functions using SimpleTimer WHILE connected.

Refer to the getting Started Blynk examples.

5

I store last value of some variable to SDcard, when hardware boot up, it get back last value from sdcard

6

you can send variable to Blynk and retrieve variable from Blynk on startup with Sync command

7

Some value created when hardware offline or in case of can not connect to internet

8

Ok, I see, sorry I couldn’t help more…

9

So does it return true even Blynk not started?

10

I think yes, it does. Let’s me check again

11

You may try also == false to be sure.

12

I checked, that’s all my mistake, Blynk.connectd() work correctly, I found out there are some wrong in my code

1 Like