[BLE] How to send data to arduino?

Hello, im beginner on ionic and i try develop to an app in BLE for a school project. So, now i can scan and connect
device. But now i want turn on a light with an arduino and a BLE module.

How do that ?

My BLE module is : https://www.amazon.fr/gp/product/B01N4P7T0H/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

I have an arduino uno R3.

The service of the module are :

Sorry for my verry bad english (im french),
Nice day ! ^^