I hope I am posting this question in the right section. I am making a Smart Home Project for my college semester finals. I am using an Atmega328p microcontroller along with an ESP8266 (Esp 01). The Atmega328p controls all the sensors and actuators and sends the data to Esp01 via serial communication.

I have created a web server on the Esp01 which I plan to access by creating an app using MIT App Inventor. My GET request is of the format "http://192.168.43.42/4" where the digit at the end is data I want to send to the server and the response I get from the server is of the format "12&0&34.8" where the '&' is used to separate different values.

My problem is , when I access the server from Chrome in my laptop I get the desired response but when I access it using the App , I get an error "Error 1101 :Cannot find the specified URL". The Esp01 is connecting to a hotspot from my phone and I have checked the IP assigned to the Esp01 to ensure my GET request is correct.

The code for Esp01 in Arduino IDE is here : https://gist.github.com/TheMagicSmoke/467d6227d670697464038056e22f302d

The blocks for the app made in App Inventor is below:

The GET request URL when entered from Chrome in laptop returns a blank page at first but upon refreshing Chrome I get the desired response I told earlier. And in the app , I have used a timer which queries the server with the same GET request every 2 seconds. But when I open the App the error keeps on popping up. Please suggest me a solution, I have googled this without any success.