Connection to Server over 4G

Issues and Errors
1

Hello,

I have a project I would like to run in a remote location.

I can connect the ESP32 to my mobile one a personal hotspot but cannot connect to the Blynk Server over 4G either the app or the ESP32.

It works fine if on a WIFI connection with internet

Any ideas?

ESP32, WIFI
Apple iPhone X IOS 14.6
Blynk server 80
Blynk Library V1.0.1 on ESP32

2

Blynk Legacy or Blynk IoT?

Does this:

mean you are using port 80?

If so then your 4G ISP may be blocking port 80 and you should try port 8080 instead.

Pete.

3

Hi Pete,

its Blynk Legacy at the moment.

Capture3

how do I change the port?

4

Change your Blynk.begin command to this format…

Blynk.begin(auth, ssid, pass, "blynk-cloud.com", 8080);

Pete.

5

Thanks,

I tried that and it does not work.

If I turn Wifi off on my phone and its just relying on cell data the App cannot connect to the server.

I am sure I tested this in the early days of designing this project and it worked fine on the hotspot

6

It may be that the 4G ISP is blocking the Blynk protocol, or possibly the hotspot app is blocking the traffic.

Pete.