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;
+        }
+    }
+}