Here you can find this application: https://apkpure.com/fr/domotstyle/com.example.myjson

1- To communicate with ESP8266 , turn on the ESP8266 and  you must  activate the Wi-Fi on your smartphone, among the proposed  networks  select AutoConnectApp.

2 - On the AutoConnectApp page, click Configure Wi-Fi.

2.1- Enable Wi-Fi sharing and select your phone's Wi-Fi network from the list of available networks.

Or choose your internet router's network if you want to use your home internet.

2.3 - Select your Wi-Fi network and enter the PIN (password)  of  your phone's or router's Wi-Fi network, then click Save.

3 - Your phone will then assign an IP number to the ESP8266 that you can see in your configuration menu by finding the devices connected to your phone in the personal networks menu.

Or:

Your home network will then assign an IP number to ESP8266 which you can find by searching for devices connected to your home network on your computer.

3.1-The IP number assigned to ESP8266 will be visible, memorize it will be useful to save it in your DOMOTSTYLE application.

4- Lunch the DOMOTSTYLE APP and press on  +  button on the bottom right of your smartphone screen and add the Ip number given earlier and the description of what the esp8266 controls.

Important:

1- After adding your ESP8266 to your phone's Wi-Fi network or your home internet it is very important that your phone's Wi-Fi  sharing or your router's Wi-Fi is active when you turn on the ESP8266, because otherwise AutoConnectAP will not appear in your phone's Wi-Fi network list and you must reset the ESP8266.

2- If you turn off the ESP8266-01S or reset , you need to repeat the steps: 1,2,2.1,2.3, but the IP number may be changed.

Additional Note:

When using your phone's Wi-Fi network, the control distance between ESP8266 and your phone is about 150 meters, so you can use it anywhere outdoors or at home as long as this distance is not exceeded.