Error 1101 when trying to control an LED with ESP8266

[Akanksha G]

Hello there!

I am trying to turn an LED on and off over wifi using an app. When I click on  ON/OFF, a request is sent and I get a message on screen telling me whether LED is on or off. The app is working fine, but I have 2 concerns:

1. When I press ON/OFF button, I get the following error:

"Error 1101:Unable to get a response with the specified URL:http://192.168.1.2/ON (or OFF)"

I am able to get rid of the error by using when screen1.ErrorOccured. However, I'd like to know what the error means and be able to prevent it. 

2. When I press ON/OFF, the message "LED status" continues to change whether or not I am connected to the internet. Is there a way to check internet connectivity and whether the state of the LED is actually changing?

Thank you in advance for your help.

Regards

Akanksha

[Juan Antonio]

Hi,

in this post I wrote about NodeMcu (it is a board with ESP8266-12E), maybe you can get some ideas.

https://groups.google.com/forum/#!category-topic/mitappinventortest/app-inventor--internet-of-things/gsvi0wZbQDU

IOT:

https://groups.google.com/forum/#!categories/mitappinventortest/app-inventor--internet-of-things

[Michael Moreau]

This fixed the same problem I had with my ESP32.

[Akanksha G]

Thank you Juan and Micheal for your replies. I was able to remove the error by using screen1.ErrorOccured block but I want to understand why the error occurs. Also, is there a way to check whether the app is connected to the internet or not when a button is pressed?

[Michael Moreau]

The error occurs because you are asking for something and not getting a response. The app is waiting for information. I haven't looked into how to send a response from the arduino.

You could always ping a server to find out if you have internet.

[Akanksha G]

Thank you Michael. What you wrote made a lot of sense. Just one question though, what did you mean by "ping a server to find out if you have internet"?

(Sorry if this sounds like a basic thing to know, I am a newbie). 

[Michael Moreau]

Its not exactly pinging but this will work. You just check to see if you get a response from a known good website.

http://www.imagnity.com/tutorials/app-inventor/check-internet-connection-in-app-inventor/