112 lines
4.9 KiB
Java
112 lines
4.9 KiB
Java
/* Copyright (C) 2016-2017 Carsten Pfeiffer
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This file is part of Gadgetbridge.
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Gadgetbridge is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published
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by the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Gadgetbridge is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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package nodomain.freeyourgadget.gadgetbridge.service.btle.profiles.alertnotification;
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import android.bluetooth.BluetoothGattCharacteristic;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import nodomain.freeyourgadget.gadgetbridge.service.btle.AbstractBTLEDeviceSupport;
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import nodomain.freeyourgadget.gadgetbridge.service.btle.BLETypeConversions;
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import nodomain.freeyourgadget.gadgetbridge.service.btle.GattCharacteristic;
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import nodomain.freeyourgadget.gadgetbridge.service.btle.TransactionBuilder;
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import nodomain.freeyourgadget.gadgetbridge.service.btle.profiles.AbstractBleProfile;
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import nodomain.freeyourgadget.gadgetbridge.util.StringUtils;
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public class AlertNotificationProfile<T extends AbstractBTLEDeviceSupport> extends AbstractBleProfile<T> {
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private static final Logger LOG = LoggerFactory.getLogger(AlertNotificationProfile.class);
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private int maxLength = 18; // Mi2-ism?
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public AlertNotificationProfile(T support) {
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super(support);
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}
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public void setMaxLength(int maxLength) {
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this.maxLength = maxLength;
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}
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public void configure(TransactionBuilder builder, AlertNotificationControl control) {
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BluetoothGattCharacteristic characteristic = getCharacteristic(GattCharacteristic.UUID_CHARACTERISTIC_ALERT_NOTIFICATION_CONTROL_POINT);
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if (characteristic != null) {
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builder.write(characteristic, control.getControlMessage());
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}
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}
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public void updateAlertLevel(TransactionBuilder builder, AlertLevel level) {
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BluetoothGattCharacteristic characteristic = getCharacteristic(GattCharacteristic.UUID_CHARACTERISTIC_ALERT_LEVEL);
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if (characteristic != null) {
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builder.write(characteristic, new byte[] {BLETypeConversions.fromUint8(level.getId())});
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}
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}
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public void newAlert(TransactionBuilder builder, NewAlert alert, OverflowStrategy strategy) {
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BluetoothGattCharacteristic characteristic = getCharacteristic(GattCharacteristic.UUID_CHARACTERISTIC_NEW_ALERT);
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if (characteristic != null) {
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String message = StringUtils.ensureNotNull(alert.getMessage());
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if (message.length() > maxLength && strategy == OverflowStrategy.TRUNCATE) {
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message = StringUtils.truncate(message, maxLength);
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}
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int numChunks = message.length() / maxLength;
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if (message.length() % maxLength > 0) {
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numChunks++;
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}
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try {
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boolean hasAlerted = false;
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for (int i = 0; i < numChunks; i++) {
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int offset = i * maxLength;
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int restLength = message.length() - offset;
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message = message.substring(offset, offset + Math.min(maxLength, restLength));
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if (hasAlerted && message.length() == 0) {
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// no need to do it again when there is no text content
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break;
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}
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builder.write(characteristic, getAlertMessage(alert, message, 1));
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hasAlerted = true;
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}
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if (!hasAlerted) {
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builder.write(characteristic, getAlertMessage(alert, "", 1));
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}
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} catch (IOException ex) {
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// ain't gonna happen
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LOG.error("Error writing alert message to ByteArrayOutputStream");
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}
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} else {
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LOG.warn("NEW_ALERT characteristic not available");
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}
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}
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protected byte[] getAlertMessage(NewAlert alert, String message, int chunk) throws IOException {
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ByteArrayOutputStream stream = new ByteArrayOutputStream(100);
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stream.write(BLETypeConversions.fromUint8(alert.getCategory().getId()));
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stream.write(BLETypeConversions.fromUint8(alert.getNumAlerts()));
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if (message.length() > 0) {
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stream.write(BLETypeConversions.toUtf8s(message));
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} else {
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// some write a null byte instead of leaving out this optional value
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// stream.write(new byte[] {0});
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}
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return stream.toByteArray();
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}
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}
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