This is tool for traffer spectrum from PDS-100G/GN
This Android app provides a line-oriented terminal / console for classic Bluetooth (2.x) devices implementing the Bluetooth Serial Port Profile (SPP)
BT and most code from https://github.com/kai-morich/SimpleBluetoothTerminal
This App implements RFCOMM connection to the well-known SPP UUID 00001101-0000-1000-8000-00805F9B34FB