Remote control unity app within another unity app

I am making an AR app in unity in which i have made some presentations. My requirement is my client has the ipad and i am having iphone. We both have same app and what i want to do is getting control of his ipad wih my iphone within the app so i can make ground detection he has nothing to tap i can access his app and use features like accessing buttons, tapping on ground detection plane.

I have gone through team viewer API :-

https://community.teamviewer.com/t5/Knowledge-Base/Remote-Access-API-Integration-Guide/ta-p/32318#toc-hId--476379713

As far i understood that it works only for android , but want this feature majorly in ios devices and my minor part is for android. I was also not been able to use this documentation for my unity project because i did not got the things well.