Implement Niot protocol

1 files changed, 102 insertions, 0 deletions

diff --git a/src/main/java/org/traccar/protocol/NiotProtocolDecoder.java b/src/main/java/org/traccar/protocol/NiotProtocolDecoder.java
new file mode 100644
index 000000000..81b6efc91
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/NiotProtocolDecoder.java
@@ -0,0 +1,102 @@
+/*
+ * Copyright 2020 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.ByteBufUtil;
+import io.netty.buffer.Unpooled;
+import io.netty.channel.Channel;
+import org.traccar.BaseProtocolDecoder;
+import org.traccar.DeviceSession;
+import org.traccar.NetworkMessage;
+import org.traccar.Protocol;
+import org.traccar.helper.BcdUtil;
+import org.traccar.helper.Checksum;
+import org.traccar.helper.DateBuilder;
+import org.traccar.helper.UnitsConverter;
+import org.traccar.model.Position;
+
+import java.net.SocketAddress;
+
+public class NiotProtocolDecoder extends BaseProtocolDecoder {
+
+    public NiotProtocolDecoder(Protocol protocol) {
+        super(protocol);
+    }
+
+    public static final int MSG_RESPONSE = 0x21;
+    public static final int MSG_POSITION_DATA = 0x80;
+
+    private void sendResponse(Channel channel, SocketAddress remoteAddress, int type, int checksum) {
+        if (channel != null) {
+            ByteBuf response = Unpooled.buffer();
+            response.writeShort(0x5858); // header
+            response.writeByte(MSG_RESPONSE);
+            response.writeShort(5); // length
+            response.writeByte(checksum);
+            response.writeByte(type);
+            response.writeByte(0); // subtype
+            response.writeByte(Checksum.xor(response.nioBuffer(2, response.writerIndex())));
+            response.writeByte(0x0D);
+            channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
+        }
+    }
+
+    @Override
+    protected Object decode(
+            Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
+
+        ByteBuf buf = (ByteBuf) msg;
+
+        buf.skipBytes(2); // header
+        int type = buf.readUnsignedByte();
+        buf.readUnsignedShort(); // length
+
+        String imei = ByteBufUtil.hexDump(buf.readSlice(8)).substring(1);
+
+        sendResponse(channel, remoteAddress, type, buf.getByte(buf.writerIndex() - 2));
+
+        if (type == MSG_POSITION_DATA) {
+
+            Position position = new Position(getProtocolName());
+
+            DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, imei);
+            if (deviceSession == null) {
+                return null;
+            }
+            position.setDeviceId(deviceSession.getDeviceId());
+
+            DateBuilder dateBuilder = new DateBuilder()
+                    .setYear(BcdUtil.readInteger(buf, 2))
+                    .setMonth(BcdUtil.readInteger(buf, 2))
+                    .setDay(BcdUtil.readInteger(buf, 2))
+                    .setHour(BcdUtil.readInteger(buf, 2))
+                    .setMinute(BcdUtil.readInteger(buf, 2))
+                    .setSecond(BcdUtil.readInteger(buf, 2));
+            position.setTime(dateBuilder.getDate());
+
+            position.setLatitude(BcdUtil.readCoordinate(buf));
+            position.setLongitude(BcdUtil.readCoordinate(buf));
+            position.setSpeed(UnitsConverter.knotsFromKph(BcdUtil.readInteger(buf, 4)));
+            position.setCourse(BcdUtil.readInteger(buf, 4));
+
+            return position;
+        }
+
+        return null;
+    }
+
+}