This app Blue Monitor handles services of Bluetooth devices both classic as well as Bluetooth Low Energy (BLE). N.B. For BLE scan turn location ON !!! While scanning a remote device can be selected resulting in een overview of its offered services. All characteristics of a selected service are listed including values of readable characteristics. Notified characteristics are updated when received. Certain services are elaborated enumerating there (parts of) characteristics in detail. These services are: Device Information Battery Service Heart Rate.
The Blue Monitor is able to act as a client as well as a server. It can listen to a service chosen in the Settings Screen. In particular the SerialPort service has been implemented. This allows 2 devices to exchange text messages. So when acting as a client : select the SerialPort service of a connected device. Or when acting as a server: choose the (default) SerialPort service via Settings and then switch Listen ON in the Overview Screen.

Features :
* switch Bluetooth ON/OFF
* make device discoverable
* scan for remote devices
* listen to client services
* show bonded or available remote devices
* show services of remote devices
* connect to remote device
* show characteristics of a connected device
* show read or notified characteristic values
* show details of services:
- Device Information
- Battery Service
- Heart Rate
* establish a session via SerialPort service with remote device
* exchange text messages via SerialPort service
* cache addresses of BLE devices for quickly connecting
* optionally switch on Bluetooth at startup
* configure discoverable duration
* configure BLE Scan duration
* configure to scan for classic or BLE devices
* configure connection security
* configure the service to listen for
* clear all cached addresses.

Requires Android 4.3 or higher.