Add PT215 frame decoder

src/main/java/org/traccar/protocol/Pt215FrameDecoder.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright 2019 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.channel.Channel;
+import io.netty.channel.ChannelHandlerContext;
+import org.traccar.BaseFrameDecoder;
+
+public class Pt215FrameDecoder extends BaseFrameDecoder {
+
+    private ByteBuf decodeFrame(ByteBuf buf, int length) {
+        if (buf.readableBytes() >= length) {
+            return buf.readRetainedSlice(length);
+        }
+        return null;
+    }
+
+    @Override
+    protected Object decode(
+            ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {
+
+        if (buf.readableBytes() < 5) {
+            return null;
+        }
+
+        int type = buf.getUnsignedByte(buf.readerIndex() + 2 + 1);
+        switch (type) {
+            case Pt215ProtocolDecoder.MSG_LOGIN:
+                return decodeFrame(buf, 15);
+            case Pt215ProtocolDecoder.MSG_GPS_REALTIME:
+            case Pt215ProtocolDecoder.MSG_GPS_OFFLINE:
+                return decodeFrame(buf, 27);
+            case Pt215ProtocolDecoder.MSG_STATUS:
+                return decodeFrame(buf, 11);
+            default:
+                return null;
+
+        }
+    }
+
+}

src/main/java/org/traccar/protocol/Pt215Protocol.java

@@ -15,7 +15,6 @@
  */
 package org.traccar.protocol;
 
-import io.netty.handler.codec.LengthFieldBasedFrameDecoder;
 import org.traccar.BaseProtocol;
 import org.traccar.PipelineBuilder;
 import org.traccar.TrackerServer;
@@ -26,7 +25,7 @@ public class Pt215Protocol extends BaseProtocol {
         addServer(new TrackerServer(false, getName()) {
             @Override
             protected void addProtocolHandlers(PipelineBuilder pipeline) {
-                pipeline.addLast(new LengthFieldBasedFrameDecoder(1024, 2, 1, -1, 0));
+                pipeline.addLast(new Pt215FrameDecoder());
                 pipeline.addLast(new Pt215ProtocolDecoder(Pt215Protocol.this));
             }
         });

src/test/java/org/traccar/protocol/Pt215FrameDecoderTest.java

@@ -0,0 +1,27 @@
+package org.traccar.protocol;
+
+import org.junit.Test;
+import org.traccar.ProtocolTest;
+
+public class Pt215FrameDecoderTest extends ProtocolTest {
+
+    @Test
+    public void testDecode() throws Exception {
+
+        Pt215FrameDecoder decoder = new Pt215FrameDecoder();
+
+        verifyFrame(
+                binary("58580d010359339075799656010d0a"),
+                decoder.decode(null, null, binary("58580d010359339075799656010d0a")));
+
+        verifyFrame(
+                binary("5858071340010819640d0a"),
+                decoder.decode(null, null, binary("5858071340010819640d0a")));
+
+        verifyFrame(
+                binary("585815101309160d0f0c9902b7015405f0e82404347afff7000d0a"),
+                decoder.decode(null, null, binary("585815101309160d0f0c9902b7015405f0e82404347afff7000d0a")));
+
+    }
+
+}