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/*
* Copyright 2023 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 org.traccar.BaseProtocolEncoder;
import org.traccar.Protocol;
import org.traccar.model.Command;
public class HuaShengProtocolEncoder extends BaseProtocolEncoder {
public HuaShengProtocolEncoder(Protocol protocol) {
super(protocol);
}
private ByteBuf encodeContent(int type, ByteBuf content) {
ByteBuf buf = Unpooled.buffer();
buf.writeByte(0xC0);
buf.writeShort(0x0000); // flag and version
buf.writeShort(12 + content.readableBytes());
buf.writeShort(type);
buf.writeShort(0); // checksum
buf.writeInt(1); // index
buf.writeBytes(content);
content.release();
buf.writeByte(0xC0);
return buf;
}
@Override
protected Object encodeCommand(Command command) {
ByteBuf content = Unpooled.buffer(0);
switch (command.getType()) {
case Command.TYPE_POSITION_PERIODIC:
content.writeShort(0x0002);
content.writeShort(6); // length
content.writeShort(command.getInteger(Command.KEY_FREQUENCY));
return encodeContent(HuaShengProtocolDecoder.MSG_SET_REQ, content);
case Command.TYPE_OUTPUT_CONTROL:
content.writeByte(
(command.getInteger(Command.KEY_INDEX) - 1) * 2
+ (2 - command.getInteger(Command.KEY_DATA)));
return encodeContent(HuaShengProtocolDecoder.MSG_CTRL_REQ, content);
case Command.TYPE_ALARM_ARM:
case Command.TYPE_ALARM_DISARM:
content.writeShort(0x0001);
content.writeShort(5); // length
content.writeByte(command.getType().equals(Command.TYPE_ALARM_ARM) ? 1 : 0);
return encodeContent(HuaShengProtocolDecoder.MSG_SET_REQ, content);
case Command.TYPE_SET_SPEED_LIMIT:
content.writeShort(0x0004);
content.writeShort(6); // length
content.writeShort(command.getInteger(Command.KEY_DATA));
return encodeContent(HuaShengProtocolDecoder.MSG_SET_REQ, content);
default:
return null;
}
}
}
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