Bluetooth Low Energy-Verbindung-Parameter für Android, iOS und Win8

Parameter zu ändern in Android (die Beantragung von zentralen zu Peripheren) können Sie etwas wie das hier tun:

private String CONN_SERVICE_UUID = "00001800-0000-1000-8000-00805f9b34fb";
private static final UUID CONN_CHARACTERISTIC_UUID = UUID.fromString("00002a04-0000-1000-8000-00805F9B34FB");
private static final int CONN_INTERVAL = 0x0006;
private static final int SUPERVISION_TIMEOUT = 0x000A;
private void findServiceForConnectionParams(List<BluetoothGattService> gattServices){
    BluetoothGattService connGattService = filterServices(gattServices, CONN_SERVICE_UUID);
    if (connGattService != null) {
        setConnectionInterval(connGattService);
    }
}
private void setConnectionInterval(BluetoothGattService gattService) {
    if (gattService == null) {
        Log.e(TAG, "setConnectionInterval. Gatt service is null!");
        return;
    }
    BluetoothGattCharacteristic connCharacteristic = 
            gattService.getCharacteristic(CONN_CHARACTERISTIC_UUID);
    if (connCharacteristic != null) {
        byte[] value = { (byte) (CONN_INTERVAL & 0x00FF), //gets LSB of 2 byte value
                (byte) ((CONN_INTERVAL & 0xFF00) >> 8), //gets MSB of 2 byte value
                (byte) (CONN_INTERVAL & 0x00FF),
                (byte) ((CONN_INTERVAL & 0xFF00) >> 8),
                0, 0,
                (byte) (SUPERVISION_TIMEOUT & 0x00FF),
                (byte) ((SUPERVISION_TIMEOUT & 0xFF00) >> 8)
        };
        connCharacteristic.setValue(value);
        boolean status = mBluetoothGatt.writeCharacteristic(connCharacteristic);
        Log.d(TAG, "setConnectionInterval. Change connection interval result: " + status);
    } else {
        Log.e(TAG, "setConnectionInterval. Connection characteristic is null!");
    }

}
private BluetoothGattService filterServices(List<BluetoothGattService> gattServices, String targetUuid) {
    for(BluetoothGattService gattService : gattServices){
        String serviceUUID = gattService.getUuid().toString();
        Log.i(TAG, "serviceUUID: " + serviceUUID);

        if(serviceUUID.equals(targetUuid)){
            Log.i(TAG, "serviceUUID matches! UUID: " + serviceUUID + " Type: " + gattService.getType());
            //no needed, just to check which characteristics are offered
            for(BluetoothGattCharacteristic characteristic : gattService.getCharacteristics()) {
                Log.i(TAG, "serviceUUID characteristics: " + characteristic.getUuid().toString());
            }
            return gattService;
        }
    }
    return null;
}

Ich muss aber sagen, dass es für mich nicht funktioniert mit Android-5-Geräte, die sowohl als periphere und zentrale, da die Generischen Acces Service (0x1800) ist nicht mit in mein Gerät Charakteristisch 0x2a04 für Bevorzugte Verbindung Parameter. Es ist nur das Angebot 0x2a00 (device name) und 0x2a01 (Aussehen).
Referenzen:

http://www.cumulations.com/blogs/7/Doing-firmware-upgrade-over-BLE-in-Android

https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.gap.peripheral_preferred_connection_parameters.xml

https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.generic_access.xml

https://farwestab.wordpress.com/2011/02/05/some-tips-on-android-and-bluetooth/

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