From 29b9ec9ddcd8248b8a8398a2c714a8f52c0581d8 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton@traccar.org>
Date: Sat, 28 Oct 2023 20:32:09 -0700
Subject: Basic Positrex protocol support

---
 .../org/traccar/protocol/PositrexProtocol.java     |  36 +++++++
 .../traccar/protocol/PositrexProtocolDecoder.java  | 106 +++++++++++++++++++++
 2 files changed, 142 insertions(+)
 create mode 100644 src/main/java/org/traccar/protocol/PositrexProtocol.java
 create mode 100644 src/main/java/org/traccar/protocol/PositrexProtocolDecoder.java

(limited to 'src/main')

diff --git a/src/main/java/org/traccar/protocol/PositrexProtocol.java b/src/main/java/org/traccar/protocol/PositrexProtocol.java
new file mode 100644
index 000000000..67b8f2189
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/PositrexProtocol.java
@@ -0,0 +1,36 @@
+/*
+ * 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 jakarta.inject.Inject;
+import org.traccar.BaseProtocol;
+import org.traccar.PipelineBuilder;
+import org.traccar.TrackerServer;
+import org.traccar.config.Config;
+
+public class PositrexProtocol extends BaseProtocol {
+
+    @Inject
+    public PositrexProtocol(Config config) {
+        addServer(new TrackerServer(config, getName(), false) {
+            @Override
+            protected void addProtocolHandlers(PipelineBuilder pipeline, Config config) {
+                pipeline.addLast(new PositrexProtocolDecoder(PositrexProtocol.this));
+            }
+        });
+    }
+
+}
diff --git a/src/main/java/org/traccar/protocol/PositrexProtocolDecoder.java b/src/main/java/org/traccar/protocol/PositrexProtocolDecoder.java
new file mode 100644
index 000000000..8726bc831
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/PositrexProtocolDecoder.java
@@ -0,0 +1,106 @@
+/*
+ * 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.buffer.ByteBuf;
+import io.netty.channel.Channel;
+import org.traccar.BaseProtocolDecoder;
+import org.traccar.Protocol;
+import org.traccar.helper.BitUtil;
+import org.traccar.helper.DateBuilder;
+import org.traccar.helper.UnitsConverter;
+import org.traccar.model.Position;
+import org.traccar.session.DeviceSession;
+
+import java.net.SocketAddress;
+import java.util.Date;
+
+public class PositrexProtocolDecoder extends BaseProtocolDecoder {
+
+    public PositrexProtocolDecoder(Protocol protocol) {
+        super(protocol);
+    }
+
+    public static final int MSG_PING = 0x2E;
+
+    private Date readTime(ByteBuf buf) {
+        long time = buf.readUnsignedInt();
+        DateBuilder dateBuilder = new DateBuilder();
+        dateBuilder.setSecond((int) (time % 60));
+        time /= 60;
+        dateBuilder.setMinute((int) (time % 60));
+        time /= 60;
+        dateBuilder.setHour((int) (time % 24));
+        time /= 24;
+        dateBuilder.setDay((int) (time % 32));
+        time /= 32;
+        dateBuilder.setMonth((int) (time % 13));
+        dateBuilder.setYear((int) (2000 + time / 13));
+        return dateBuilder.getDate();
+    }
+
+    @Override
+    protected Object decode(
+            Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
+
+        ByteBuf buf = (ByteBuf) msg;
+
+        int first = buf.getUnsignedByte(buf.readerIndex());
+        int second = buf.getUnsignedByte(buf.readerIndex() + 1);
+        long deviceId;
+        if (BitUtil.check(first, 7)) {
+            if (BitUtil.check(first, 6)) {
+                deviceId = 73000000 + BitUtil.to(buf.readUnsignedInt(), 30);
+            } else if (second == 0) {
+                deviceId = 7590000 + BitUtil.to(buf.readUnsignedMedium(), 20);
+            } else {
+                deviceId = 70000000 + BitUtil.to(buf.readUnsignedMedium(), 20);
+            }
+        } else {
+            deviceId = 7560000 + buf.readUnsignedShort();
+        }
+
+        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, String.valueOf(deviceId));
+        if (deviceSession == null) {
+            return null;
+        }
+
+        int service = buf.readUnsignedByte();
+        if (service == MSG_PING) {
+
+            Position position = new Position(getProtocolName());
+            position.setDeviceId(deviceSession.getDeviceId());
+
+            position.setTime(readTime(buf));
+
+            int latitude = buf.readMedium();
+            int longitude = buf.readMedium();
+
+            position.setValid(BitUtil.check(latitude, 23));
+            position.setLatitude(BitUtil.to(latitude, 23) * 0.000025);
+            position.setLongitude(longitude * 0.000025);
+
+            position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte()));
+            position.setCourse(buf.readUnsignedByte() * 2);
+
+            return position;
+
+        }
+
+        return null;
+    }
+
+}
-- 
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