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/*
* Copyright 2015 - 2017 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.DateBuilder;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.ByteOrder;
public class MxtProtocolDecoder extends BaseProtocolDecoder {
public MxtProtocolDecoder(MxtProtocol protocol) {
super(protocol);
}
public static final int MSG_ACK = 0x02;
public static final int MSG_NACK = 0x03;
public static final int MSG_POSITION = 0x31;
private static void sendResponse(Channel channel, int device, long id, int crc) {
if (channel != null) {
ChannelBuffer response = ChannelBuffers.dynamicBuffer(ByteOrder.LITTLE_ENDIAN, 0);
response.writeByte(device);
response.writeByte(MSG_ACK);
response.writeInt((int) id);
response.writeShort(crc);
response.writeShort(Checksum.crc16(
Checksum.CRC16_XMODEM, response.toByteBuffer()));
ChannelBuffer encoded = ChannelBuffers.dynamicBuffer();
encoded.writeByte(0x01); // header
while (response.readable()) {
int b = response.readByte();
if (b == 0x01 || b == 0x04 || b == 0x10 || b == 0x11 || b == 0x13) {
encoded.writeByte(0x10);
b += 0x20;
}
encoded.writeByte(b);
}
encoded.writeByte(0x04); // ending
channel.write(encoded);
}
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
buf.readUnsignedByte(); // start
int device = buf.readUnsignedByte(); // device descriptor
int type = buf.readUnsignedByte();
long id = buf.readUnsignedInt();
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, String.valueOf(id));
if (deviceSession == null) {
return null;
}
if (type == MSG_POSITION) {
Position position = new Position();
position.setProtocol(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
buf.readUnsignedByte(); // protocol
int infoGroups = buf.readUnsignedByte();
position.set(Position.KEY_INDEX, buf.readUnsignedShort());
DateBuilder dateBuilder = new DateBuilder().setDate(2000, 1, 1);
long date = buf.readUnsignedInt();
long days = BitUtil.from(date, 6 + 6 + 5);
long hours = BitUtil.between(date, 6 + 6, 6 + 6 + 5);
long minutes = BitUtil.between(date, 6, 6 + 6);
long seconds = BitUtil.to(date, 6);
dateBuilder.addMillis((((days * 24 + hours) * 60 + minutes) * 60 + seconds) * 1000);
position.setTime(dateBuilder.getDate());
position.setValid(true);
position.setLatitude(buf.readInt() / 1000000.0);
position.setLongitude(buf.readInt() / 1000000.0);
long flags = buf.readUnsignedInt();
position.set(Position.KEY_IGNITION, BitUtil.check(flags, 0));
if (BitUtil.check(flags, 1)) {
position.set(Position.KEY_ALARM, Position.ALARM_GENERAL);
}
position.set(Position.KEY_INPUT, BitUtil.between(flags, 2, 7));
position.set(Position.KEY_OUTPUT, BitUtil.between(flags, 7, 10));
position.setCourse(BitUtil.between(flags, 10, 13) * 45);
//position.setValid(BitUtil.check(flags, 15));
position.set(Position.KEY_CHARGE, BitUtil.check(flags, 20));
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte()));
buf.readUnsignedByte(); // input mask
if (BitUtil.check(infoGroups, 0)) {
buf.skipBytes(8); // waypoints
}
if (BitUtil.check(infoGroups, 1)) {
buf.skipBytes(8); // wireless accessory
}
if (BitUtil.check(infoGroups, 2)) {
position.set(Position.KEY_SATELLITES, buf.readUnsignedByte());
position.set(Position.KEY_HDOP, buf.readUnsignedByte());
buf.readUnsignedByte(); // GPS accuracy
position.set(Position.KEY_RSSI, buf.readUnsignedByte());
buf.readUnsignedShort(); // time since boot
buf.readUnsignedByte(); // input voltage
position.set(Position.PREFIX_TEMP + 1, buf.readByte());
}
if (BitUtil.check(infoGroups, 3)) {
position.set(Position.KEY_ODOMETER, buf.readUnsignedInt());
}
if (BitUtil.check(infoGroups, 4)) {
position.set(Position.KEY_HOURS, buf.readUnsignedInt());
}
if (BitUtil.check(infoGroups, 5)) {
buf.readUnsignedInt(); // reason
}
if (BitUtil.check(infoGroups, 6)) {
position.set(Position.KEY_POWER, buf.readUnsignedShort() * 0.001);
position.set(Position.KEY_BATTERY, buf.readUnsignedShort());
}
if (BitUtil.check(infoGroups, 7)) {
position.set(Position.KEY_RFID, buf.readUnsignedInt());
}
buf.readerIndex(buf.writerIndex() - 3);
sendResponse(channel, device, id, buf.readUnsignedShort());
return position;
}
return null;
}
}
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