1 files changed, 107 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/protocol/EelinkProtocolEncoder.java b/src/main/java/org/traccar/protocol/EelinkProtocolEncoder.java
new file mode 100644
index 000000000..8f33441fb
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/EelinkProtocolEncoder.java
@@ -0,0 +1,107 @@
+/*
+ * Copyright 2016 - 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.DataConverter;
+import org.traccar.model.Command;
+
+import java.nio.ByteBuffer;
+import java.nio.charset.StandardCharsets;
+
+public class EelinkProtocolEncoder extends BaseProtocolEncoder {
+
+    private boolean connectionless;
+
+    public EelinkProtocolEncoder(boolean connectionless) {
+        this.connectionless = connectionless;
+    }
+
+    public static int checksum(ByteBuffer buf) {
+        int sum = 0;
+        while (buf.hasRemaining()) {
+            sum = (((sum << 1) | (sum >> 15)) + (buf.get() & 0xFF)) & 0xFFFF;
+        }
+        return sum;
+    }
+
+    public static ByteBuf encodeContent(
+            boolean connectionless, String uniqueId, int type, int index, ByteBuf content) {
+
+        ByteBuf buf = Unpooled.buffer();
+
+        if (connectionless) {
+            buf.writeBytes(DataConverter.parseHex('0' + uniqueId));
+        }
+
+        buf.writeByte(0x67);
+        buf.writeByte(0x67);
+        buf.writeByte(type);
+        buf.writeShort(2 + (content != null ? content.readableBytes() : 0)); // length
+        buf.writeShort(index);
+
+        if (content != null) {
+            buf.writeBytes(content);
+        }
+
+        ByteBuf result = Unpooled.buffer();
+
+        if (connectionless) {
+            result.writeByte('E');
+            result.writeByte('L');
+            result.writeShort(2 + buf.readableBytes()); // length
+            result.writeShort(checksum(buf.nioBuffer()));
+        }
+
+        result.writeBytes(buf);
+        buf.release();
+
+        return result;
+    }
+
+    private ByteBuf encodeContent(long deviceId, String content) {
+
+        ByteBuf buf = Unpooled.buffer();
+
+        buf.writeByte(0x01); // command
+        buf.writeInt(0); // server id
+        buf.writeBytes(content.getBytes(StandardCharsets.UTF_8));
+
+        return encodeContent(connectionless, getUniqueId(deviceId), EelinkProtocolDecoder.MSG_DOWNLINK, 0, buf);
+    }
+
+    @Override
+    protected Object encodeCommand(Command command) {
+
+        switch (command.getType()) {
+            case Command.TYPE_CUSTOM:
+                return encodeContent(command.getDeviceId(), command.getString(Command.KEY_DATA));
+            case Command.TYPE_POSITION_SINGLE:
+                return encodeContent(command.getDeviceId(), "WHERE#");
+            case Command.TYPE_ENGINE_STOP:
+                return encodeContent(command.getDeviceId(), "RELAY,1#");
+            case Command.TYPE_ENGINE_RESUME:
+                return encodeContent(command.getDeviceId(), "RELAY,0#");
+            case Command.TYPE_REBOOT_DEVICE:
+                return encodeContent(command.getDeviceId(), "RESET#");
+            default:
+                return null;
+        }
+    }
+
+}