1 files changed, 67 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/protocol/KhdProtocolEncoder.java b/src/main/java/org/traccar/protocol/KhdProtocolEncoder.java
new file mode 100644
index 000000000..c66129283
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/KhdProtocolEncoder.java
@@ -0,0 +1,67 @@
+/*
+ * Copyright 2015 - 2018 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.helper.Checksum;
+import org.traccar.model.Command;
+
+public class KhdProtocolEncoder extends BaseProtocolEncoder {
+
+    public static final int MSG_CUT_OIL = 0x39;
+    public static final int MSG_RESUME_OIL = 0x38;
+
+    private ByteBuf encodeCommand(int command, String uniqueId) {
+
+        ByteBuf buf = Unpooled.buffer();
+
+        buf.writeByte(0x29);
+        buf.writeByte(0x29);
+
+        buf.writeByte(command);
+        buf.writeShort(6); // size
+
+        uniqueId = "00000000".concat(uniqueId);
+        uniqueId = uniqueId.substring(uniqueId.length() - 8);
+        buf.writeByte(Integer.parseInt(uniqueId.substring(0, 2)));
+        buf.writeByte(Integer.parseInt(uniqueId.substring(2, 4)) + 0x80);
+        buf.writeByte(Integer.parseInt(uniqueId.substring(4, 6)) + 0x80);
+        buf.writeByte(Integer.parseInt(uniqueId.substring(6, 8)));
+
+        buf.writeByte(Checksum.xor(buf.nioBuffer()));
+        buf.writeByte(0x0D); // ending
+
+        return buf;
+    }
+
+    @Override
+    protected Object encodeCommand(Command command) {
+
+        String uniqueId = getUniqueId(command.getDeviceId());
+
+        switch (command.getType()) {
+            case Command.TYPE_ENGINE_STOP:
+                return encodeCommand(MSG_CUT_OIL, uniqueId);
+            case Command.TYPE_ENGINE_RESUME:
+                return encodeCommand(MSG_RESUME_OIL, uniqueId);
+            default:
+                return null;
+        }
+    }
+
+}