1 files changed, 137 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/protocol/VltProtocolDecoder.java b/src/main/java/org/traccar/protocol/VltProtocolDecoder.java
new file mode 100644
index 000000000..8890dece1
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/VltProtocolDecoder.java
@@ -0,0 +1,137 @@
+/*
+ * Copyright 2023 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.channel.Channel;
+import io.netty.handler.codec.http.FullHttpRequest;
+import io.netty.handler.codec.http.HttpResponseStatus;
+import io.netty.handler.codec.http.QueryStringDecoder;
+import org.traccar.BaseHttpProtocolDecoder;
+import org.traccar.Protocol;
+import org.traccar.helper.Parser;
+import org.traccar.helper.PatternBuilder;
+import org.traccar.model.CellTower;
+import org.traccar.model.Network;
+import org.traccar.model.Position;
+import org.traccar.session.DeviceSession;
+
+import java.net.SocketAddress;
+import java.nio.charset.StandardCharsets;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.regex.Pattern;
+
+public class VltProtocolDecoder extends BaseHttpProtocolDecoder {
+
+    public VltProtocolDecoder(Protocol protocol) {
+        super(protocol);
+    }
+
+    private static final Pattern PATTERN = new PatternBuilder()
+            .number("(dd)")                      // alert id
+            .expression("([HL])")                // history
+            .number("([01])")                    // validity
+            .number("(dd)(dd)(dd)")              // date (ddmmyy)
+            .number("(dd)(dd)(dd)")              // time (hhmmss)
+            .number("(d{3}.d{6})([NS])")         // latitude
+            .number("(d{3}.d{6})([EW])")         // longitude
+            .number("(d{3})")                    // mcc
+            .expression("(x*[0-9]+)")            // mnc
+            .number("(x{4})")                    // lac
+            .number("(d{9})")                    // cid
+            .number("(d{3}.d{2})")               // speed
+            .number("(d{3}.d{2})")               // course
+            .number("(d{2})")                    // satellites
+            .number("(d{2})")                    // hdop
+            .number("(d{2})")                    // rssi
+            .number("([01])")                    // ignition
+            .number("([01])")                    // charging
+            .expression("([HMS])")               // vehicle mode
+            .compile();
+
+    private Position decodePosition(DeviceSession deviceSession, String sentence) {
+
+        Parser parser = new Parser(PATTERN, sentence);
+        if (!parser.matches()) {
+            return null;
+        }
+
+        Position position = new Position(getProtocolName());
+        position.setDeviceId(deviceSession.getDeviceId());
+
+        position.set(Position.KEY_EVENT, parser.nextInt());
+        position.set(Position.KEY_ARCHIVE, parser.next().equals("H") ? true : null);
+
+        position.setValid(parser.nextInt() > 0);
+        position.setTime(parser.nextDateTime(Parser.DateTimeFormat.DMY_HMS));
+        position.setLatitude(parser.nextCoordinate(Parser.CoordinateFormat.DEG_HEM));
+        position.setLongitude(parser.nextCoordinate(Parser.CoordinateFormat.DEG_HEM));
+
+        int mcc = parser.nextInt();
+        int mnc = Integer.parseInt(parser.next().replaceAll("x", ""));
+        int lac = parser.nextHexInt();
+        int cid = parser.nextInt();
+
+        position.setSpeed(parser.nextDouble());
+        position.setCourse(parser.nextDouble());
+
+        position.set(Position.KEY_SATELLITES, parser.nextInt());
+        position.set(Position.KEY_HDOP, parser.nextInt());
+
+        position.setNetwork(new Network(CellTower.from(mcc, mnc, lac, cid, parser.nextInt())));
+
+        position.set(Position.KEY_IGNITION, parser.nextInt() > 0);
+        position.set(Position.KEY_CHARGE, parser.nextInt() > 0);
+        position.set(Position.KEY_MOTION, parser.next().equals("M"));
+
+        return position;
+    }
+
+    @Override
+    protected Object decode(
+            Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
+
+        FullHttpRequest request = (FullHttpRequest) msg;
+        QueryStringDecoder decoder = new QueryStringDecoder(
+                request.content().toString(StandardCharsets.US_ASCII), false);
+        String sentence = decoder.parameters().get("vltdata").iterator().next();
+
+        int index = 0;
+        String type = sentence.substring(index, index += 3);
+        String imei = sentence.substring(index, index += 15);
+
+        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, imei);
+        if (deviceSession == null) {
+            sendResponse(channel, HttpResponseStatus.BAD_REQUEST);
+            return null;
+        }
+
+        sendResponse(channel, HttpResponseStatus.OK);
+
+        switch (type) {
+            case "NRM":
+                return decodePosition(deviceSession, sentence.substring(3 + 15));
+            default:
+                List<Position> positions = new LinkedList<>();
+                int count = Integer.parseInt(sentence.substring(index, index += 3));
+                for (int i = 0; i < count; i++) {
+                    positions.add(decodePosition(deviceSession, sentence.substring(index, index += 78)));
+                }
+                return positions;
+        }
+    }
+
+}