Java tutorial
/* * Copyright (C) 2013 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.nordicsemi.UART_UDP_PROXY; import android.app.Service; import android.bluetooth.BluetoothAdapter; import android.bluetooth.BluetoothDevice; import android.bluetooth.BluetoothGatt; import android.bluetooth.BluetoothGattCallback; import android.bluetooth.BluetoothGattCharacteristic; import android.bluetooth.BluetoothGattDescriptor; import android.bluetooth.BluetoothGattService; import android.bluetooth.BluetoothManager; import android.bluetooth.BluetoothProfile; import android.content.Context; import android.content.Intent; import android.os.Binder; import android.os.IBinder; import android.support.v4.content.LocalBroadcastManager; import android.util.Log; import java.util.ArrayList; import java.util.List; import java.util.UUID; import com.arm.mbed.UartRPC; import com.arm.mbed.UartRPCCallbacks; /** * Service for managing connection and data communication with a GATT server hosted on a * given Bluetooth LE device. */ public class UartService extends Service implements UartRPCCallbacks { public static final String TAG = "UARTUDPPROXY"; private BluetoothManager mBluetoothManager; private BluetoothAdapter mBluetoothAdapter; private String mBluetoothDeviceAddress; private BluetoothGatt mBluetoothGatt; private int mConnectionState = STATE_DISCONNECTED; // DA private UartRPC m_uart_rpc = new UartRPC(this); private MainActivity m_ui = null; private static final int STATE_DISCONNECTED = 0; private static final int STATE_CONNECTING = 1; private static final int STATE_CONNECTED = 2; public final static String ACTION_GATT_CONNECTED = "com.nordicsemi.nrfUART.ACTION_GATT_CONNECTED"; public final static String ACTION_GATT_DISCONNECTED = "com.nordicsemi.nrfUART.ACTION_GATT_DISCONNECTED"; public final static String ACTION_GATT_SERVICES_DISCOVERED = "com.nordicsemi.nrfUART.ACTION_GATT_SERVICES_DISCOVERED"; public final static String ACTION_DATA_AVAILABLE = "com.nordicsemi.nrfUART.ACTION_DATA_AVAILABLE"; public final static String EXTRA_DATA = "com.nordicsemi.nrfUART.EXTRA_DATA"; public final static String DEVICE_DOES_NOT_SUPPORT_UART = "com.nordicsemi.nrfUART.DEVICE_DOES_NOT_SUPPORT_UART"; public static final UUID TX_POWER_UUID = UUID.fromString("00001804-0000-1000-8000-00805f9b34fb"); public static final UUID TX_POWER_LEVEL_UUID = UUID.fromString("00002a07-0000-1000-8000-00805f9b34fb"); public static final UUID CCCD = UUID.fromString("00002902-0000-1000-8000-00805f9b34fb"); public static final UUID FIRMWARE_REVISON_UUID = UUID.fromString("00002a26-0000-1000-8000-00805f9b34fb"); public static final UUID DIS_UUID = UUID.fromString("0000180a-0000-1000-8000-00805f9b34fb"); public static final UUID RX_SERVICE_UUID = UUID.fromString("6e400001-b5a3-f393-e0a9-e50e24dcca9e"); public static final UUID RX_CHAR_UUID = UUID.fromString("6e400002-b5a3-f393-e0a9-e50e24dcca9e"); public static final UUID TX_CHAR_UUID = UUID.fromString("6e400003-b5a3-f393-e0a9-e50e24dcca9e"); // Implements callback methods for GATT events that the app cares about. For example, // connection change and services discovered. private final BluetoothGattCallback mGattCallback = new BluetoothGattCallback() { @Override public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) { String intentAction; if (newState == BluetoothProfile.STATE_CONNECTED) { intentAction = ACTION_GATT_CONNECTED; mConnectionState = STATE_CONNECTED; broadcastUpdate(intentAction); Log.i(TAG, "Connected to GATT server."); // Attempts to discover services after successful connection. Log.i(TAG, "Attempting to start service discovery:" + mBluetoothGatt.discoverServices()); } else if (newState == BluetoothProfile.STATE_DISCONNECTED) { intentAction = ACTION_GATT_DISCONNECTED; mConnectionState = STATE_DISCONNECTED; Log.i(TAG, "Disconnected from GATT server."); broadcastUpdate(intentAction); } } @Override public void onServicesDiscovered(BluetoothGatt gatt, int status) { if (status == BluetoothGatt.GATT_SUCCESS) { Log.w(TAG, "mBluetoothGatt = " + mBluetoothGatt); broadcastUpdate(ACTION_GATT_SERVICES_DISCOVERED); } else { Log.w(TAG, "onServicesDiscovered received: " + status); } } @Override public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) { if (status == BluetoothGatt.GATT_SUCCESS) { broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic); } } @Override public void onCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic) { broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic); } }; private void broadcastUpdate(final String action) { final Intent intent = new Intent(action); LocalBroadcastManager.getInstance(this).sendBroadcast(intent); } private void broadcastUpdate(final String action, final BluetoothGattCharacteristic characteristic) { final Intent intent = new Intent(action); if (TX_CHAR_UUID.equals(characteristic.getUuid())) { // Log.d(TAG, String.format("Received TX: %d",characteristic.getValue() )); intent.putExtra(EXTRA_DATA, characteristic.getValue()); } else { } LocalBroadcastManager.getInstance(this).sendBroadcast(intent); // DA onDataReceived(characteristic.getStringValue(0)); } public class LocalBinder extends Binder { UartService getService() { return UartService.this; } } @Override public IBinder onBind(Intent intent) { return mBinder; } @Override public boolean onUnbind(Intent intent) { // After using a given device, you should make sure that BluetoothGatt.close() is called // such that resources are cleaned up properly. In this particular example, close() is // invoked when the UI is disconnected from the Service. close(); return super.onUnbind(intent); } private final IBinder mBinder = new LocalBinder(); /** * Initializes a reference to the local Bluetooth adapter. * * @return Return true if the initialization is successful. */ public boolean initialize(MainActivity ui) { // DA this.m_ui = ui; // For API level 18 and above, get a reference to BluetoothAdapter through // BluetoothManager. if (mBluetoothManager == null) { mBluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE); if (mBluetoothManager == null) { Log.e(TAG, "Unable to initialize BluetoothManager."); return false; } } mBluetoothAdapter = mBluetoothManager.getAdapter(); if (mBluetoothAdapter == null) { Log.e(TAG, "Unable to obtain a BluetoothAdapter."); return false; } return true; } /** * Connects to the GATT server hosted on the Bluetooth LE device. * * @param address The device address of the destination device. * * @return Return true if the connection is initiated successfully. The connection result * is reported asynchronously through the * {@code BluetoothGattCallback#onConnectionStateChange(android.bluetooth.BluetoothGatt, int, int)} * callback. */ public boolean connect(final String address) { if (mBluetoothAdapter == null || address == null) { Log.w(TAG, "BluetoothAdapter not initialized or unspecified address."); return false; } // Previously connected device. Try to reconnect. if (mBluetoothDeviceAddress != null && address.equals(mBluetoothDeviceAddress) && mBluetoothGatt != null) { Log.d(TAG, "Trying to use an existing mBluetoothGatt for connection."); if (mBluetoothGatt.connect()) { mConnectionState = STATE_CONNECTING; return true; } else { return false; } } final BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address); if (device == null) { Log.w(TAG, "Device not found. Unable to connect."); return false; } // We want to directly connect to the device, so we are setting the autoConnect // parameter to false. mBluetoothGatt = device.connectGatt(this, false, mGattCallback); Log.d(TAG, "Trying to create a new connection."); mBluetoothDeviceAddress = address; mConnectionState = STATE_CONNECTING; return true; } /** * Disconnects an existing connection or cancel a pending connection. The disconnection result * is reported asynchronously through the * {@code BluetoothGattCallback#onConnectionStateChange(android.bluetooth.BluetoothGatt, int, int)} * callback. */ public void disconnect() { if (mBluetoothAdapter == null || mBluetoothGatt == null) { Log.w(TAG, "BluetoothAdapter not initialized"); return; } mBluetoothGatt.disconnect(); // mBluetoothGatt.close(); // DA this.disconnectSocket(); } /** * After using a given BLE device, the app must call this method to ensure resources are * released properly. */ public void close() { if (mBluetoothGatt == null) { return; } Log.w(TAG, "mBluetoothGatt closed"); mBluetoothDeviceAddress = null; mBluetoothGatt.close(); mBluetoothGatt = null; } /** * Request a read on a given {@code BluetoothGattCharacteristic}. The read result is reported * asynchronously through the {@code BluetoothGattCallback#onCharacteristicRead(android.bluetooth.BluetoothGatt, android.bluetooth.BluetoothGattCharacteristic, int)} * callback. * * @param characteristic The characteristic to read from. */ public void readCharacteristic(BluetoothGattCharacteristic characteristic) { if (mBluetoothAdapter == null || mBluetoothGatt == null) { Log.w(TAG, "BluetoothAdapter not initialized"); return; } mBluetoothGatt.readCharacteristic(characteristic); } /** * Enables or disables notification on a give characteristic. * * @param characteristic Characteristic to act on. * @param enabled If true, enable notification. False otherwise. */ /* public void setCharacteristicNotification(BluetoothGattCharacteristic characteristic, boolean enabled) { if (mBluetoothAdapter == null || mBluetoothGatt == null) { Log.w(TAG, "BluetoothAdapter not initialized"); return; } mBluetoothGatt.setCharacteristicNotification(characteristic, enabled); if (UUID_HEART_RATE_MEASUREMENT.equals(characteristic.getUuid())) { BluetoothGattDescriptor descriptor = characteristic.getDescriptor( UUID.fromString(SampleGattAttributes.CLIENT_CHARACTERISTIC_CONFIG)); descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE); mBluetoothGatt.writeDescriptor(descriptor); } }*/ /** * Enable TXNotification * * @return */ public void enableTXNotification() { /* if (mBluetoothGatt == null) { showMessage("mBluetoothGatt null" + mBluetoothGatt); broadcastUpdate(DEVICE_DOES_NOT_SUPPORT_UART); return; } */ BluetoothGattService RxService = mBluetoothGatt.getService(RX_SERVICE_UUID); if (RxService == null) { showMessage("Rx service not found!"); broadcastUpdate(DEVICE_DOES_NOT_SUPPORT_UART); return; } BluetoothGattCharacteristic TxChar = RxService.getCharacteristic(TX_CHAR_UUID); if (TxChar == null) { showMessage("Tx charateristic not found!"); broadcastUpdate(DEVICE_DOES_NOT_SUPPORT_UART); return; } mBluetoothGatt.setCharacteristicNotification(TxChar, true); BluetoothGattDescriptor descriptor = TxChar.getDescriptor(CCCD); descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE); mBluetoothGatt.writeDescriptor(descriptor); } public void writeRXCharacteristic(byte[] value) { BluetoothGattService RxService = mBluetoothGatt.getService(RX_SERVICE_UUID); showMessage("mBluetoothGatt null" + mBluetoothGatt); if (RxService == null) { showMessage("Rx service not found!"); broadcastUpdate(DEVICE_DOES_NOT_SUPPORT_UART); return; } BluetoothGattCharacteristic RxChar = RxService.getCharacteristic(RX_CHAR_UUID); if (RxChar == null) { showMessage("Rx charateristic not found!"); broadcastUpdate(DEVICE_DOES_NOT_SUPPORT_UART); return; } RxChar.setValue(value); boolean status = mBluetoothGatt.writeCharacteristic(RxChar); Log.d(TAG, "write RXchar - status=" + status); } private void showMessage(String msg) { Log.e(TAG, msg); } /** * Retrieves a list of supported GATT services on the connected device. This should be * invoked only after {@code BluetoothGatt#discoverServices()} completes successfully. * * @return A {@code List} of supported services. */ public List<BluetoothGattService> getSupportedGattServices() { if (mBluetoothGatt == null) return null; return mBluetoothGatt.getServices(); } // DA @Override public void ackSocketOpen(boolean open_ok) { int opened = 0; if (open_ok) opened = 1; String socket_open_ack = "[1|" + opened + "]"; Log.d(TAG, "ackSocketOpen(): ack: " + socket_open_ack + " being sent for socket() open status..."); this.sendData(socket_open_ack); } // DA @Override public void disconnectSocket() { if (this.m_uart_rpc != null) this.m_uart_rpc.close(); } // DA @Override public void sendData(final String data) { this.m_ui.logAction("UDP", "UART", data.getBytes()); this.writeRXCharacteristic(data.getBytes()); } // DA private List<String> splitEqually(String text, int size) { // Give the list the right capacity to start with. You could use an array // instead if you wanted. List<String> ret = new ArrayList<String>(); for (int start = 0; start < text.length(); start += size) { String tmp = text.substring(start, Math.min(text.length(), start + size)); while (tmp.length() < size) tmp += " "; Log.d(TAG, "splitEqually(): adding " + tmp + "..."); ret.add(tmp); } return ret; } // DA @Override public void sendOverUART(byte[] data, int length) { String packet = this.m_uart_rpc.rpc_recv_data(data, length); if (packet != null) { Log.d(TAG, "sendOverUART(): encoded_data=[" + packet + "] length: " + packet.length() + "... splitting..."); List<String> list = this.splitEqually(packet, 20); for (int i = 0; i < list.size(); ++i) { //this.m_ui.logAction("UDP","UART", list.get(i).getBytes()); this.sendData(list.get(i)); } } else { Log.d(TAG, "sendOverUART(): dropping null packet. Base64 encoding failed.."); } } // DA @Override public void onDataReceived(final String data) { if (data != null && data.length() > 0) { String trimmed_data = this.m_uart_rpc.trimData(data); // if we received an ACK... we will ignore it... if (trimmed_data.equalsIgnoreCase("ACK") == false) { Log.d(TAG, "onDataReceived(): data=[" + trimmed_data + "] length: " + trimmed_data.length()); if (this.m_uart_rpc.accumulate(trimmed_data)) { this.m_ui.logAction("UART", "UDP", this.m_uart_rpc.getAccumulation().getBytes()); this.m_uart_rpc.dispatch(); } // send back an ACK byte... this will reset the notifications and will allow the peer to continue... this.sendData("ACK"); } else { // just received an ACK... so no need to reply with another... this.m_ui.logAction("UART", "UDP", trimmed_data.getBytes()); Log.d(TAG, "onDataReceived(): recevied ACK (OK)... continuing..."); } } } }