Ionic 4 - RSSI and Ibeacon with native plugin

Hello people, My name is Luiguy, actually I’m working on my master degree’s research and I was trying to develop an app, which could get RSSI from the phone to the router or any AP connected to it, and the ibeacon with bluetooth scaling, that means that I would need the dBm values to determinate distance for each phone on that environment. My first question is, is there any plugin working with these informations already? if there is, do I need to buy it? The second is - does ionic supports these kind of information for ios and android? (I heard that RSSI plugin could be not accepted for IOS store)