This uses the Android Bluetooth Low Energy sample codebase to read Generic Attribute Profile (GATT) to transmit arbitrary data between devices. It has customization for the Sylvac calipers.
The S CAL EVO Calipers have three services/profiles. The first service offers 3 characteristics which can be read, the second service offers no characteristics and the third service offers 4 characteristics.
The UUID for these services and characteristics are listed in SCalEvoBluetoothSpecifications.java. Currently we dont know what these services are for, nor what the characteristics mean but we have named them so that as we discover what they mean we annotate them.
There are two buttons, one for requesting manual data, one for connecting or disconnecting from the calipers.
Changing the mode is done by two steps:
- Set the characteristic notificaiton to true
- mBluetoothLeService.setCharacteristicNotification(characteristic, true);
- Set the value of the descriptor to enable notification
- descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
The S_CAL_EVO calipers dont appear to follow any existing profiles for mesurement devices:
This sample can list all available Bluetooth LE devices and provides an interface to connect, display data and display GATT services and characteristics supported by any device.
It creates a Service for managing connection and data communication with a GATT server hosted on a given Bluetooth LE device.
The Activities communicate with the Service, which in turn interacts with the Bluetooth LE API.
- Android SDK v23
- Android Build Tools v23.0.2
- Android Support Repository
This sample uses the Gradle build system. To build this project, use the "gradlew build" command or use "Import Project" in Android Studio.
Copyright 2014 The Android Open Source Project, Inc.
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