ad-hoc-network

I am working on my Bachelor Thesis and I have to implement an application using Google Nearby Connection API. The goal is to develop a disaster assistance app. I tested Google Nearby Connection for the past two day and I have some problems, quesitons. I have 6 devices, 4 Motorola G (2nd Generation), 1 Nexus 5X and 1 OnePlus 5T. They all are up to date. I also use the latest version of Google Nearby 'com.google.android.gms:play-services-nearby:15.0.1' Here are my questions: The Motorola devices ask for a pairing code to connect one to another, but even when the pairing is accepted they do not