diff options
Diffstat (limited to 'src/main/java/org/traccar/protocol/GatorProtocolEncoder.java')
-rw-r--r-- | src/main/java/org/traccar/protocol/GatorProtocolEncoder.java | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/protocol/GatorProtocolEncoder.java b/src/main/java/org/traccar/protocol/GatorProtocolEncoder.java new file mode 100644 index 000000000..3d38b7455 --- /dev/null +++ b/src/main/java/org/traccar/protocol/GatorProtocolEncoder.java @@ -0,0 +1,76 @@ +/* + * Copyright 2023 Hossain Mohammad Seym (seym45@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 io.netty.buffer.ByteBuf; +import io.netty.buffer.Unpooled; +import org.traccar.BaseProtocolEncoder; +import org.traccar.Protocol; +import org.traccar.helper.Checksum; +import org.traccar.model.Command; + +public class GatorProtocolEncoder extends BaseProtocolEncoder { + + public GatorProtocolEncoder(Protocol protocol) { + super(protocol); + } + + public ByteBuf encodeId(long deviceId) { + ByteBuf buf = Unpooled.buffer(); + + String id = getUniqueId(deviceId); + + int firstDigit = Integer.parseInt(id.substring(1, 3)) - 30; + + buf.writeByte(Integer.parseInt(id.substring(3, 5)) | (((firstDigit >> 3) & 1) << 7)); + buf.writeByte(Integer.parseInt(id.substring(5, 7)) | (((firstDigit >> 2) & 1) << 7)); + buf.writeByte(Integer.parseInt(id.substring(7, 9)) | (((firstDigit >> 1) & 1) << 7)); + buf.writeByte(Integer.parseInt(id.substring(9)) | ((firstDigit & 1) << 7)); + + return buf; + } + + private ByteBuf encodeContent(long deviceId, int type) { + ByteBuf buf = Unpooled.buffer(); + + buf.writeByte(0x24); + buf.writeByte(0x24); + buf.writeByte(type); + buf.writeByte(0x00); + buf.writeByte(4 + 1 + 1); // ip 4 bytes, checksum and end byte + + ByteBuf pseudoIPAddress = encodeId(deviceId); + buf.writeBytes(pseudoIPAddress); + + int checksum = Checksum.xor(buf.nioBuffer()); + buf.writeByte(checksum); + + buf.writeByte(0x0D); + + return buf; + } + + @Override + protected Object encodeCommand(Command command) { + + switch (command.getType()) { + case Command.TYPE_POSITION_SINGLE: + return encodeContent(command.getDeviceId(), GatorProtocolDecoder.MSG_POSITION_REQUEST); + default: + return null; + } + } +} |