This Android App is a necessary research tool in the field of RFID. It includes proxmark3 universal client. The client comes from the latest RRG Iceman repo.
You can use it to connect your Proxmark 3 RDV4.0 via Bluetooth or USB-OTG. Later it will be compatible with more devices in the future.

Open Source: https://github.com/RfidResearchGroup/RFIDtools

Welcome you to join our project. :)