67 lines
2.8 KiB
Java
67 lines
2.8 KiB
Java
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 static final int MAX_MSG_LENGTH = 18;
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public AlertNotificationProfile(T support) {
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super(support);
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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 = alert.getMessage();
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if (message.length() > MAX_MSG_LENGTH && strategy == OverflowStrategy.TRUNCATE) {
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message = StringUtils.truncate(message, MAX_MSG_LENGTH);
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}
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int numChunks = message.length() / MAX_MSG_LENGTH;
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if (message.length() % MAX_MSG_LENGTH > 0) {
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numChunks++;
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}
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for (int i = 0; i < numChunks; i++) {
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int offset = i * MAX_MSG_LENGTH;
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int restLength = message.length() - offset;
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message = message.substring(offset, offset + Math.min(MAX_MSG_LENGTH, restLength));
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if (message.length() == 0) {
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break;
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}
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writeAlertMessage(builder, characteristic, alert, message, i);
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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 void writeAlertMessage(TransactionBuilder builder, BluetoothGattCharacteristic characteristic, NewAlert alert, String message, int chunk) {
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try {
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ByteArrayOutputStream stream = new ByteArrayOutputStream(100);
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stream.write(alert.getCategory().getId());
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stream.write(alert.getNumAlerts());
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stream.write(BLETypeConversions.toUtf8s(message));
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builder.write(characteristic, stream.toByteArray());
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} catch (IOException ex) {
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// aint gonna happen
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LOG.error("Error writing alert message to ByteArrayOutputStream");
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}
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}
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}
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