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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.Crc;
import org.traccar.model.Command;
public class Gt06ProtocolEncoder extends BaseProtocolEncoder {
@Override
protected Object encodeCommand(Command command) {
String content = "";
switch (command.getType()) {
case Command.TYPE_ENGINE_STOP:
content = "DYD#";
break;
case Command.TYPE_ENGINE_RESUME:
content = "HFYD#";
break;
}
int serverFlagBit = 0x00;
int commandLength = serverFlagBit + content.length();
int packetLength = 0x80 + content.length() + 2 + 2;
ChannelBuffer response = ChannelBuffers.dynamicBuffer();
response.writeBytes(new byte[]{0x78, 0x78}); // Start Bit
response.writeByte(packetLength); // Packet Length
response.writeByte(0x80); // Protocol Number
// Information Content
response.writeByte(commandLength); // Length of command
response.writeByte(serverFlagBit); // Server Flag Bit
response.writeBytes(content.getBytes()); // Command Content
response.writeBytes(new byte[]{0x00, 0x02}); // Language
response.writeShort(1); // Information Serial Number
int crc = Crc.crc16Ccitt(response.toByteBuffer(2, response.writerIndex()));
response.writeShort(crc); // Error Check
response.writeBytes(new byte[] {0x0D, 0x0A}); // Stop Bit
return response;
}
}
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