From 23f83e9f1c6c0f183256a3952a8b3a819dc0ea1c Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Fri, 6 Nov 2015 11:56:19 +1300
Subject: Finish OBD decoder implementation

---
 src/org/traccar/helper/ObdDecoder.java | 50 +++++++++++++++++++++++++++++++++-
 1 file changed, 49 insertions(+), 1 deletion(-)

(limited to 'src/org/traccar/helper')

diff --git a/src/org/traccar/helper/ObdDecoder.java b/src/org/traccar/helper/ObdDecoder.java
index 63fd30b09..684702bba 100644
--- a/src/org/traccar/helper/ObdDecoder.java
+++ b/src/org/traccar/helper/ObdDecoder.java
@@ -15,13 +15,61 @@
  */
 package org.traccar.helper;
 
+import org.traccar.model.Event;
+
+import java.util.AbstractMap;
+import java.util.Map;
+
 public class ObdDecoder {
 
     private static final int MODE_CURRENT = 0x01;
     private static final int MODE_FREEZE_FRAME = 0x02;
-    private static final int MODE_DTC = 0x03; // diagnostic trouble codes
 
+    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;
+        }
+    }
 
 }
-- 
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