Use APKPure App
Get Bluetooth LE Analyzer old version APK for Android
Bluetooth Low Energy AD Paket Messung App
Two modes are available :
_ one for all BLE devices
_ one for Rfduino flashed with software available at https://github.com/bertrandmartel/bluetooth-le-analyzer where you can measure packet reception rate and set scan interval value
Github : https://github.com/bertrandmartel/bluetooth-le-analyzer
This application is released under GPLv3 license