1 files changed, 78 insertions, 0 deletions
diff --git a/src/org/traccar/helper/ObdDecoder.java b/src/org/traccar/helper/ObdDecoder.java
new file mode 100644
index 000000000..35fa4dc07
--- /dev/null
+++ b/src/org/traccar/helper/ObdDecoder.java
@@ -0,0 +1,78 @@
+/*
+ * Copyright 2015 Anton Tananaev (anton.tananaev@gmail.com)
+ *
+ * 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.helper;
+
+import org.traccar.model.Event;
+
+import java.util.AbstractMap;
+import java.util.Map;
+
+public final class ObdDecoder {
+
+    private ObdDecoder() {
+    }
+
+    private static final int MODE_CURRENT = 0x01;
+    private static final int MODE_FREEZE_FRAME = 0x02;
+
+    private static final int PID_ENGINE_LOAD = 0x04;
+    private static final int PID_COOLANT_TEMPERATURE = 0x05;
+    private static final int PID_ENGINE_RPM = 0x0C;
+    private static final int PID_VEHICLE_SPEED = 0x0D;
+    private static final int PID_THROTTLE_POSITION = 0x11;
+    private static final int PID_MIL_DISTANCE = 0x21;
+    private static final int PID_FUEL_LEVEL = 0x2F;
+    private static final int PID_DISTANCE_CLEARED = 0x31;
+
+    public static Map.Entry<String, Object> decode(int mode, int pid, String value) {
+        switch (mode) {
+            case MODE_CURRENT:
+            case MODE_FREEZE_FRAME:
+                return decodeData(pid, value);
+            default:
+                return null;
+        }
+    }
+
+    private static Map.Entry<String, Object> createEntry(String key, Object value) {
+        return new AbstractMap.SimpleEntry<>(key, value);
+    }
+
+    private static Map.Entry<String, Object> decodeData(int pid, String value) {
+        int intValue = Integer.parseInt(value, 16);
+        switch (pid) {
+            case PID_ENGINE_LOAD:
+                return createEntry("engine-load", intValue * 100 / 255);
+            case PID_COOLANT_TEMPERATURE:
+                return createEntry("coolant-temperature", intValue - 40);
+            case PID_ENGINE_RPM:
+                return createEntry(Event.KEY_RPM, intValue / 4);
+            case PID_VEHICLE_SPEED:
+                return createEntry(Event.KEY_OBD_SPEED, intValue);
+            case PID_THROTTLE_POSITION:
+                return createEntry("throttle", intValue * 100 / 255);
+            case PID_MIL_DISTANCE:
+                return createEntry("mil-distance", intValue);
+            case PID_FUEL_LEVEL:
+                return createEntry(Event.KEY_FUEL, intValue * 100 / 255);
+            case PID_DISTANCE_CLEARED:
+                return createEntry(Event.KEY_FUEL, intValue);
+            default:
+                return null;
+        }
+    }
+
+}