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/*
* Copyright 2021 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 io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.session.DeviceSession;
import org.traccar.NetworkMessage;
import org.traccar.Protocol;
import org.traccar.helper.Checksum;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
import java.util.Date;
public class ThinkPowerProtocolDecoder extends BaseProtocolDecoder {
public ThinkPowerProtocolDecoder(Protocol protocol) {
super(protocol);
}
public static final int MSG_LOGIN_REQUEST = 0x01;
public static final int MSG_LOGIN_RESPONSE = 0x02;
public static final int MSG_HEARTBEAT_REQUEST = 0x03;
public static final int MSG_HEARTBEAT_RESPONSE = 0x04;
public static final int MSG_RECORD_REPORT = 0x05;
public static final int MSG_RECORD_RESPONSE = 0x06;
private void sendResponse(Channel channel, int type, int index, ByteBuf content) {
if (channel != null) {
ByteBuf response = Unpooled.buffer();
response.writeByte(type);
response.writeByte(index);
if (content != null) {
response.writeShort(content.readableBytes());
response.writeBytes(content);
content.release();
} else {
response.writeShort(0);
}
response.writeShort(Checksum.crc16(Checksum.CRC16_CCITT_FALSE, response.nioBuffer()));
channel.writeAndFlush(new NetworkMessage(response, channel.remoteAddress()));
}
}
private void decodeValue(Position position, int type, ByteBuf buf) {
switch (type) {
case 0x01:
position.setValid(true);
position.setLatitude(buf.readInt() * 0.0000001);
position.setLongitude(buf.readInt() * 0.0000001);
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedShort() * 0.1));
position.setCourse(buf.readUnsignedShort() * 0.01);
break;
case 0x02:
position.setValid(buf.readUnsignedByte() > 0);
break;
case 0x03:
buf.skipBytes(3); // geofence
break;
case 0x06:
case 0x07:
case 0x08:
buf.skipBytes(2); // g-sensor x/y/z
break;
case 0x09:
buf.readUnsignedByte(); // collision alarm
break;
case 0x0A:
buf.readUnsignedByte(); // drop alarm
break;
case 0x10:
if (buf.readUnsignedByte() > 0) {
position.set(Position.KEY_ALARM, Position.ALARM_SOS);
}
break;
case 0x12:
position.set(Position.KEY_BATTERY, buf.readUnsignedShort() * 0.1);
break;
case 0x13:
if (buf.readUnsignedByte() > 0) {
position.set(Position.KEY_ALARM, Position.ALARM_LOW_BATTERY);
}
break;
case 0x16:
buf.readUnsignedShort(); // temperature
break;
case 0x17:
buf.readUnsignedByte(); // humidity
break;
case 0x18:
buf.readUnsignedShort(); // high temperature
break;
case 0x19:
buf.readUnsignedByte(); // high humidity
break;
case 0x50:
if (buf.readUnsignedByte() > 0) {
position.set(Position.KEY_ALARM, Position.ALARM_REMOVING);
}
break;
case 0x51:
if (buf.readUnsignedByte() > 0) {
position.set(Position.KEY_ALARM, Position.ALARM_TAMPERING);
}
break;
default:
break;
}
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
int type = buf.readUnsignedByte();
int index = buf.readUnsignedByte();
buf.readUnsignedShort(); // length
if (type == MSG_LOGIN_REQUEST) {
buf.readUnsignedByte(); // protocol major version
buf.readUnsignedByte(); // protocol minor version
String id = buf.readCharSequence(buf.readUnsignedByte(), StandardCharsets.US_ASCII).toString();
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, id);
ByteBuf content = Unpooled.buffer();
content.writeByte(deviceSession != null ? 0 : 4);
sendResponse(channel, MSG_LOGIN_RESPONSE, index, content);
} else if (type == MSG_HEARTBEAT_REQUEST) {
sendResponse(channel, MSG_HEARTBEAT_RESPONSE, index, null);
} else if (type == MSG_RECORD_REPORT) {
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
if (deviceSession == null) {
return null;
}
buf.readUnsignedByte(); // count
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
position.setTime(new Date(buf.readUnsignedInt() * 1000));
while (buf.readableBytes() > 2) {
decodeValue(position, buf.readUnsignedByte(), buf);
}
sendResponse(channel, MSG_RECORD_RESPONSE, index, null);
return position;
}
return null;
}
}
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