DFRobot manufacture the Bluno - An Arduino Bluetooth 4.0 (BLE) Board. Their first example project led me to Public Lab:
Project 1. Build KnowFlow: automatic water monitor
KnowFlow is the name of this water quality monitoring device, based on Arduino Uno.
It can automatically monitor 5 parameters of water: pH, Temperature, Dissolved Oxygen, Electronic Conductivity, ORP._
It would be great to be able to send the data to an Android App via BLE. It's easy to create the App exactly as required with MIT's App Inventor http://ai2.appinventor.mit.edu
However, I cannot find an Arduino Sketch for KnowFlow and Bluno that uses Bluno's onboard BLE to share data collected. Has anybody achieved this?