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/*
* Copyright 2018 Anton Tananaev (anton@traccar.org)
*
* 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 org.traccar.protocol;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.DeviceSession;
import org.traccar.helper.BitUtil;
import org.traccar.helper.Checksum;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.CellTower;
import org.traccar.model.Network;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
import java.util.Date;
public class RoboTrackProtocolDecoder extends BaseProtocolDecoder {
public RoboTrackProtocolDecoder(RoboTrackProtocol protocol) {
super(protocol);
}
public static final int MSG_ID = 0x00;
public static final int MSG_ACK = 0x80;
public static final int MSG_GPS = 0x03;
public static final int MSG_GSM = 0x04;
public static final int MSG_IMAGE_START = 0x06;
public static final int MSG_IMAGE_DATA = 0x07;
public static final int MSG_IMAGE_END = 0x08;
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
int type = buf.readUnsignedByte();
if (type == MSG_ID) {
buf.skipBytes(16); // name
String imei = buf.readBytes(15).toString(StandardCharsets.US_ASCII);
if (getDeviceSession(channel, remoteAddress, imei) != null && channel != null) {
ChannelBuffer response = ChannelBuffers.dynamicBuffer();
buf.writeByte(MSG_ACK);
buf.writeByte(0x01); // success
response.writeByte(Checksum.crc8(Checksum.CRC8_ROHC, response.toByteBuffer()));
channel.write(response);
}
} else if (type == MSG_GPS || type == MSG_GSM) {
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
if (deviceSession == null) {
return null;
}
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
position.setDeviceTime(new Date(buf.readUnsignedInt() * 1000));
if (type == MSG_GPS) {
position.setValid(true);
position.setFixTime(position.getDeviceTime());
position.setLatitude(buf.readInt() * 0.000001);
position.setLongitude(buf.readInt() * 0.000001);
position.setSpeed(UnitsConverter.knotsFromKph(buf.readByte()));
} else {
getLastLocation(position, position.getDeviceTime());
position.setNetwork(new Network(CellTower.from(
buf.readUnsignedShort(), buf.readUnsignedShort(),
buf.readUnsignedShort(), buf.readUnsignedShort())));
buf.readUnsignedByte(); // reserved
}
int value = buf.readUnsignedByte();
position.set(Position.KEY_SATELLITES, BitUtil.to(value, 4));
position.set(Position.KEY_RSSI, BitUtil.between(value, 4, 7));
position.set(Position.KEY_MOTION, BitUtil.check(value, 7));
value = buf.readUnsignedByte();
position.set(Position.KEY_CHARGE, BitUtil.check(value, 0));
for (int i = 1; i <= 4; i++) {
position.set(Position.PREFIX_IN + i, BitUtil.check(value, i));
}
position.set(Position.KEY_BATTERY_LEVEL, BitUtil.from(value, 5) * 100 / 7);
position.set(Position.KEY_DEVICE_TEMP, buf.readByte());
for (int i = 1; i <= 3; i++) {
position.set(Position.PREFIX_ADC + i, buf.readUnsignedShort());
}
return position;
}
return null;
}
}
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