2 files changed, 8 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/protocol/UuxProtocolDecoder.java b/src/main/java/org/traccar/protocol/UuxProtocolDecoder.java
index 545784865..1081fa811 100644
--- a/src/main/java/org/traccar/protocol/UuxProtocolDecoder.java
+++ b/src/main/java/org/traccar/protocol/UuxProtocolDecoder.java
@@ -40,6 +40,7 @@ public class UuxProtocolDecoder extends BaseProtocolDecoder {
     public static final int MSG_IMMOBILIZER = 0x9E;
     public static final int MSG_ACK = 0xD0;
     public static final int MSG_NACK = 0xF0;
+    public static final int MSG_KEEPALIVE = 0xFF;
 
     private void sendResponse(Channel channel, int productCode, int protocolVersion, int type) {
         if (channel != null && BitUtil.check(protocolVersion, 7)) {
@@ -71,6 +72,10 @@ public class UuxProtocolDecoder extends BaseProtocolDecoder {
         buf.readUnsignedByte(); // length
         int type = buf.readUnsignedByte();
 
+        if (type == MSG_KEEPALIVE) {
+            return null;
+        }
+
         String vehicleId = buf.readCharSequence(10, StandardCharsets.US_ASCII).toString();
         DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, vehicleId);
         if (deviceSession == null) {
diff --git a/src/test/java/org/traccar/protocol/UuxProtocolDecoderTest.java b/src/test/java/org/traccar/protocol/UuxProtocolDecoderTest.java
index c1acfd740..753063d26 100644
--- a/src/test/java/org/traccar/protocol/UuxProtocolDecoderTest.java
+++ b/src/test/java/org/traccar/protocol/UuxProtocolDecoderTest.java
@@ -10,6 +10,9 @@ public class UuxProtocolDecoderTest extends ProtocolTest {
 
         var decoder = new UuxProtocolDecoder(null);
 
+        verifyNull(decoder, binary(
+                "81910b01ff"));
+
         verifyAttributes(decoder, binary(
                 "81910c5a9031395533443630363631051e061a1e07397079712a000000000000413133333135332e333939304e30333531322e393837324530303031303030303000000200000000001f303036323236303030303030303030300000ffff"));