/* * MIT License * * Copyright (c) 2017 Inova IT * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ package si.inova.neatle.operation; import android.bluetooth.BluetoothGatt; import android.bluetooth.BluetoothGattCharacteristic; import android.bluetooth.BluetoothGattDescriptor; import android.bluetooth.BluetoothGattService; import android.support.annotation.IntDef; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.util.Arrays; import java.util.UUID; import si.inova.neatle.monitor.Connection; import si.inova.neatle.util.NeatleLogger; class SubscribeCommand extends SingleCharacteristicsCommand { private static final UUID CLIENT_CHARACTERISTIC_CONFIG = UUID.fromString("00002902-0000-1000-8000-00805f9b34fb"); @Type private final int type; SubscribeCommand(@Type int type, UUID serviceUUID, UUID characteristicUUID, CommandObserver observer) { super(serviceUUID, characteristicUUID, observer); this.type = type; } @Override protected void start(Connection connection, BluetoothGatt gatt) { if (type == Type.UNSUBSCRIBE && connection.getCharacteristicsChangedListenerCount(characteristicUUID) > 0) { NeatleLogger.d("Won't unsubscribe on " + characteristicUUID + " since it has registered listeners"); finish(CommandResult.createEmptySuccess(characteristicUUID)); return; } BluetoothGattService service = gatt.getService(serviceUUID); if (service == null) { finish(CommandResult.createErrorResult(characteristicUUID, SERVICE_NOT_FOUND)); return; } BluetoothGattCharacteristic characteristic = service.getCharacteristic(characteristicUUID); if (characteristic == null) { finish(CommandResult.createErrorResult(characteristicUUID, CHARACTERISTIC_NOT_FOUND)); return; } BluetoothGattDescriptor descriptor = characteristic.getDescriptor(CLIENT_CHARACTERISTIC_CONFIG); if (descriptor == null) { finish(CommandResult.createErrorResult(characteristicUUID, DESCRIPTOR_NOT_FOUND)); return; } boolean turnOn; byte[] valueToWrite; switch (type) { case Type.SUBSCRIBE_INDICATION: NeatleLogger.d("Subscribing to indications on " + characteristicUUID); valueToWrite = BluetoothGattDescriptor.ENABLE_INDICATION_VALUE; turnOn = true; break; case Type.SUBSCRIBE_NOTIFICATION: NeatleLogger.d("Subscribing to notifications on " + characteristicUUID); valueToWrite = BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE; turnOn = true; break; case Type.UNSUBSCRIBE: NeatleLogger.d("Unsubscribing from notifications/indications on " + characteristicUUID); valueToWrite = BluetoothGattDescriptor.DISABLE_NOTIFICATION_VALUE; turnOn = false; break; default: throw new IllegalStateException(); } byte[] descriptorValue = descriptor.getValue(); if (Arrays.equals(descriptorValue, valueToWrite)) { NeatleLogger.d("No subscription changes needed - is at " + valueToWrite[0] + " on " + characteristicUUID); finish(CommandResult.createEmptySuccess(characteristicUUID)); return; } if (!gatt.setCharacteristicNotification(characteristic, turnOn)) { NeatleLogger.e("Failed to change characteristics notification flag on " + characteristicUUID); finish(CommandResult.createErrorResult(characteristicUUID, BluetoothGatt.GATT_FAILURE)); return; } descriptor.setValue(valueToWrite); NeatleLogger.d("Writing descriptor on " + characteristicUUID); if (!gatt.writeDescriptor(descriptor)) { NeatleLogger.e("Failed to write descriptor on " + characteristicUUID); finish(CommandResult.createErrorResult(characteristicUUID, BluetoothGatt.GATT_FAILURE)); } } @Override protected void onDescriptorWrite(BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status) { if (status != BluetoothGatt.GATT_SUCCESS) { finish(CommandResult.createErrorResult(characteristicUUID, status)); } else { finish(CommandResult.createEmptySuccess(characteristicUUID)); } } @Override protected void onError(int error) { finish(CommandResult.createErrorResult(characteristicUUID, error)); } @Override public String toString() { if (type == Type.UNSUBSCRIBE) { return "UnsubscribeCommand[" + characteristicUUID + "] on [" + serviceUUID + "]"; } else if (type == Type.SUBSCRIBE_INDICATION) { return "SubscribeCommand[" + characteristicUUID + "] on [" + serviceUUID + "]"; } else if (type == Type.SUBSCRIBE_NOTIFICATION) { return "SubscribeNotificationCommand[" + characteristicUUID + "] on [" + serviceUUID + "]"; } else { return super.toString(); } } @Retention(RetentionPolicy.SOURCE) @IntDef({Type.SUBSCRIBE_NOTIFICATION, Type.SUBSCRIBE_INDICATION, Type.UNSUBSCRIBE}) @interface Type { int SUBSCRIBE_NOTIFICATION = 0; int SUBSCRIBE_INDICATION = 1; int UNSUBSCRIBE = 2; } }