4 files changed, 34 insertions, 3 deletions
diff --git a/src/org/traccar/helper/ChannelBufferTools.java b/src/org/traccar/helper/ChannelBufferTools.java
index 9139ed7ae..4f1ebb7c0 100644
--- a/src/org/traccar/helper/ChannelBufferTools.java
+++ b/src/org/traccar/helper/ChannelBufferTools.java
@@ -15,6 +15,7 @@
  */
 package org.traccar.helper;
 
+import java.util.Formatter;
 import org.jboss.netty.buffer.ChannelBuffer;
 
 /**
@@ -77,4 +78,23 @@ public class ChannelBufferTools {
         return result;
     }
 
+    /**
+     * Return hex string
+     */
+    public static String readHexString(ChannelBuffer buf, int length) {
+        
+        StringBuilder result = new StringBuilder();
+        Formatter formatter = new Formatter(result);
+        
+        for (int i = 0; i < length / 2; i++) {
+            formatter.format("%02x", buf.readByte());
+        }
+        
+        if (length % 2 == 1) {
+            int b = buf.getUnsignedByte(buf.readerIndex());
+            formatter.format("%01x", b >>> 4);
+        }
+        
+        return result.toString();
+    }
 }
diff --git a/src/org/traccar/protocol/Jt600ProtocolDecoder.java b/src/org/traccar/protocol/Jt600ProtocolDecoder.java
index 8a2be63fb..11932f8ce 100644
--- a/src/org/traccar/protocol/Jt600ProtocolDecoder.java
+++ b/src/org/traccar/protocol/Jt600ProtocolDecoder.java
@@ -50,8 +50,8 @@ public class Jt600ProtocolDecoder extends GenericProtocolDecoder {
         buf.readByte(); // header
         
         // Get device by identifier
-        int id = ChannelBufferTools.readHexInteger(buf, 10);
-        position.setDeviceId(getDataManager().getDeviceByImei(String.valueOf(id)).getId());
+        String id = Long.valueOf(ChannelBufferTools.readHexString(buf, 10)).toString();
+        position.setDeviceId(getDataManager().getDeviceByImei(id).getId());
         
         buf.readByte(); // protocol version + data type
         
diff --git a/test/org/traccar/helper/ChannelBufferToolsTest.java b/test/org/traccar/helper/ChannelBufferToolsTest.java
index 16ff036b8..792770dab 100644
--- a/test/org/traccar/helper/ChannelBufferToolsTest.java
+++ b/test/org/traccar/helper/ChannelBufferToolsTest.java
@@ -20,4 +20,15 @@ public class ChannelBufferToolsTest {
                 factory.getBuffer(buf, 0, buf.length), 5);
         assertEquals(1903, result);
     }
+    
+    @Test
+    public void testReadHexString() {
+        byte[] buf = {0x01,(byte)0x90,0x34};
+        String result = ChannelBufferTools.readHexString(
+                factory.getBuffer(buf, 0, buf.length), 5);
+        assertEquals("01903", result);
+        
+        result = Long.valueOf(result).toString();
+        assertEquals("1903", result);
+    }
 }
diff --git a/test/org/traccar/protocol/Jt600ProtocolDecoderTest1.java b/test/org/traccar/protocol/Jt600ProtocolDecoderTest.java
index cdf8f1568..c08ca0605 100644
--- a/test/org/traccar/protocol/Jt600ProtocolDecoderTest1.java
+++ b/test/org/traccar/protocol/Jt600ProtocolDecoderTest.java
@@ -5,7 +5,7 @@ import org.jboss.netty.buffer.ChannelBuffers;
 import static org.junit.Assert.assertNotNull;
 import org.junit.Test;
 
-public class Jt600ProtocolDecoderTest1 {
+public class Jt600ProtocolDecoderTest {
 
     @Test
     public void testDecode() throws Exception {