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/*
* Copyright 2015 Anton Tananaev (anton.tananaev@gmail.com)
*
* 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.traccar.BaseProtocolEncoder;
import org.traccar.helper.Checksum;
import org.traccar.helper.Log;
import org.traccar.model.Command;
import javax.xml.bind.DatatypeConverter;
import java.nio.charset.Charset;
import java.util.Map;
public class MeiligaoProtocolEncoder extends BaseProtocolEncoder {
public static final int MSG_TRACK_ON_DEMAND = 0x4101;
public static final int MSG_TRACK_BY_INTERVAL = 0x4102;
public static final int MSG_MOVEMENT_ALARM = 0x4106;
public static final int MSG_TIME_ZONE = 0x4132;
public static final int MSG_REBOOT_GPS = 0x4902;
private ChannelBuffer encodeContent(long deviceId, int type, ChannelBuffer content) {
ChannelBuffer buf = ChannelBuffers.dynamicBuffer();
buf.writeByte('@');
buf.writeByte('@');
buf.writeShort(2 + 2 + 7 + 2 + content.readableBytes() + 2 + 2); // message length
buf.writeBytes(DatatypeConverter.parseHexBinary((getUniqueId(deviceId) + "FFFFFFFFFFFFFF").substring(0, 14)));
buf.writeShort(type);
buf.writeBytes(content);
buf.writeShort(Checksum.crc16(Checksum.CRC16_CCITT_FALSE, buf.toByteBuffer()));
buf.writeByte('\r');
buf.writeByte('\n');
return buf;
}
// TODO: remove if not needed
private static int radiusToArea(int radius) {
if (radius == 0) {
return 0x00;
} else if (radius <= 30) {
return 0x01;
} else if (radius <= 50) {
return 0x02;
} else if (radius <= 100) {
return 0x03;
} else if (radius <= 200) {
return 0x04;
} else if (radius <= 300) {
return 0x05;
} else if (radius <= 500) {
return 0x06;
} else if (radius <= 1000) {
return 0x07;
} else if (radius <= 2000) {
return 0x08;
} else {
return 0xff;
}
}
@Override
protected Object encodeCommand(Command command) {
ChannelBuffer content = ChannelBuffers.dynamicBuffer();
Map<String, Object> attributes = command.getAttributes();
switch (command.getType()) {
case Command.TYPE_POSITION_SINGLE:
return encodeContent(command.getDeviceId(), MSG_TRACK_ON_DEMAND, content);
case Command.TYPE_POSITION_PERIODIC:
content.writeShort(((Number) attributes.get(Command.KEY_FREQUENCY)).intValue() / 10);
return encodeContent(command.getDeviceId(), MSG_TRACK_BY_INTERVAL, content);
case Command.TYPE_MOVEMENT_ALARM:
content.writeShort(((Number) attributes.get(Command.KEY_RADIUS)).intValue());
return encodeContent(command.getDeviceId(), MSG_MOVEMENT_ALARM, content);
case Command.TYPE_SET_TIMEZONE:
int offset = ((Number) attributes.get(Command.KEY_TIMEZONE)).intValue() / 60;
content.writeBytes(String.valueOf(offset).getBytes(Charset.defaultCharset()));
return encodeContent(command.getDeviceId(), MSG_TIME_ZONE, content);
case Command.TYPE_REBOOT_DEVICE:
return encodeContent(command.getDeviceId(), MSG_REBOOT_GPS, content);
default:
Log.warning(new UnsupportedOperationException(command.getType()));
break;
}
return null;
}
}
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