Fix GT06 transparent data

3 files changed, 21 insertions, 25 deletions

diff --git a/src/main/java/org/traccar/helper/BufferUtil.java b/src/main/java/org/traccar/helper/BufferUtil.java
index d1025f548..12c31ba9d 100644
--- a/src/main/java/org/traccar/helper/BufferUtil.java
+++ b/src/main/java/org/traccar/helper/BufferUtil.java
@@ -71,4 +71,16 @@ public final class BufferUtil {
         }
     }
 
+    public static boolean isPrintable(ByteBuf buf, int length) {
+        boolean printable = true;
+        for (int i = 0; i < length; i++) {
+            byte b = buf.getByte(buf.readerIndex() + i);
+            if (b < 32 && b != '\r' && b != '\n') {
+                printable = false;
+                break;
+            }
+        }
+        return printable;
+    }
+
 }
diff --git a/src/main/java/org/traccar/protocol/Gt06ProtocolDecoder.java b/src/main/java/org/traccar/protocol/Gt06ProtocolDecoder.java
index 383d4cb3a..e1bc2b5ad 100644
--- a/src/main/java/org/traccar/protocol/Gt06ProtocolDecoder.java
+++ b/src/main/java/org/traccar/protocol/Gt06ProtocolDecoder.java
@@ -20,6 +20,7 @@ import io.netty.buffer.ByteBufUtil;
 import io.netty.buffer.Unpooled;
 import io.netty.channel.Channel;
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.helper.BufferUtil;
 import org.traccar.session.DeviceSession;
 import org.traccar.NetworkMessage;
 import org.traccar.Protocol;
@@ -1382,19 +1383,13 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
             getLastLocation(position, null);
 
             buf.readUnsignedByte(); // external device type code
-            int length = buf.readableBytes() - 9; // line break + checksum + index + checksum + footer
 
-            if (length <= 0) {
-                return null;
-            } else if (length < 8) {
-                position.set(
-                        Position.PREFIX_TEMP + 1,
-                        Double.parseDouble(buf.readCharSequence(length - 1, StandardCharsets.US_ASCII).toString()));
+            ByteBuf data = buf.readSlice(buf.readableBytes() - 6); // index + checksum + footer
+            if (BufferUtil.isPrintable(data, data.readableBytes())) {
+                String value = data.readCharSequence(data.readableBytes(), StandardCharsets.US_ASCII).toString();
+                position.set(Position.KEY_RESULT, value.trim());
             } else {
-                buf.readUnsignedByte(); // card type
-                position.set(
-                        Position.KEY_DRIVER_UNIQUE_ID,
-                        buf.readCharSequence(length - 1, StandardCharsets.US_ASCII).toString());
+                position.set(Position.KEY_RESULT, ByteBufUtil.hexDump(data));
             }
 
             return position;
diff --git a/src/main/java/org/traccar/protocol/TeltonikaProtocolDecoder.java b/src/main/java/org/traccar/protocol/TeltonikaProtocolDecoder.java
index c8e0005f9..e888642b4 100644
--- a/src/main/java/org/traccar/protocol/TeltonikaProtocolDecoder.java
+++ b/src/main/java/org/traccar/protocol/TeltonikaProtocolDecoder.java
@@ -20,6 +20,7 @@ import io.netty.buffer.ByteBufUtil;
 import io.netty.buffer.Unpooled;
 import io.netty.channel.Channel;
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.helper.BufferUtil;
 import org.traccar.model.Device;
 import org.traccar.session.DeviceSession;
 import org.traccar.NetworkMessage;
@@ -112,18 +113,6 @@ public class TeltonikaProtocolDecoder extends BaseProtocolDecoder {
         }
     }
 
-    private boolean isPrintable(ByteBuf buf, int length) {
-        boolean printable = true;
-        for (int i = 0; i < length; i++) {
-            byte b = buf.getByte(buf.readerIndex() + i);
-            if (b < 32 && b != '\r' && b != '\n') {
-                printable = false;
-                break;
-            }
-        }
-        return printable;
-    }
-
     private void decodeSerial(
             Channel channel, SocketAddress remoteAddress, DeviceSession deviceSession, Position position, ByteBuf buf) {
 
@@ -169,7 +158,7 @@ public class TeltonikaProtocolDecoder extends BaseProtocolDecoder {
             position.set(Position.KEY_TYPE, type);
 
             int length = buf.readInt();
-            if (isPrintable(buf, length)) {
+            if (BufferUtil.isPrintable(buf, length)) {
                 String data = buf.readSlice(length).toString(StandardCharsets.US_ASCII).trim();
                 if (data.startsWith("UUUUww") && data.endsWith("SSS")) {
                     String[] values = data.substring(6, data.length() - 4).split(";");
@@ -636,7 +625,7 @@ public class TeltonikaProtocolDecoder extends BaseProtocolDecoder {
                 buf.readUnsignedByte(); // type
                 int length = buf.readInt() - 4;
                 getLastLocation(position, new Date(buf.readUnsignedInt() * 1000));
-                if (isPrintable(buf, length)) {
+                if (BufferUtil.isPrintable(buf, length)) {
                     String data = buf.readCharSequence(length, StandardCharsets.US_ASCII).toString().trim();
                     if (data.startsWith("GTSL")) {
                         position.set(Position.KEY_DRIVER_UNIQUE_ID, data.split("\\|")[4]);