2 files changed, 18 insertions, 1 deletions
diff --git a/src/main/java/org/traccar/protocol/TeltonikaProtocolDecoder.java b/src/main/java/org/traccar/protocol/TeltonikaProtocolDecoder.java
index 974d2c106..485df833a 100644
--- a/src/main/java/org/traccar/protocol/TeltonikaProtocolDecoder.java
+++ b/src/main/java/org/traccar/protocol/TeltonikaProtocolDecoder.java
@@ -145,8 +145,22 @@ public class TeltonikaProtocolDecoder extends BaseProtocolDecoder {
         } else {
 
             position.set(Position.KEY_TYPE, type);
-            position.set(Position.KEY_RESULT, buf.readSlice(buf.readInt()).toString(StandardCharsets.US_ASCII));
 
+            int length = buf.readInt();
+            boolean readable = true;
+            for (int i = 0; i < length; i++) {
+                byte b = buf.getByte(buf.readerIndex() + i);
+                if (b < 32 && b != '\r' && b != '\n') {
+                    readable = false;
+                    break;
+                }
+            }
+
+            if (readable) {
+                position.set(Position.KEY_RESULT, buf.readSlice(length).toString(StandardCharsets.US_ASCII));
+            } else {
+                position.set(Position.KEY_RESULT, ByteBufUtil.hexDump(buf.readSlice(length)));
+            }
         }
     }
 
diff --git a/src/test/java/org/traccar/protocol/TeltonikaProtocolDecoderTest.java b/src/test/java/org/traccar/protocol/TeltonikaProtocolDecoderTest.java
index f94cd9460..b515fbdc6 100644
--- a/src/test/java/org/traccar/protocol/TeltonikaProtocolDecoderTest.java
+++ b/src/test/java/org/traccar/protocol/TeltonikaProtocolDecoderTest.java
@@ -15,6 +15,9 @@ public class TeltonikaProtocolDecoderTest extends ProtocolTest {
         verifyNull(decoder, binary(
                 "000F313233343536373839303132333435"));
 
+        verifyPositions(decoder, false, binary(
+                "00000000000000100C010600000008010300010015D5C5010000D988"));
+
         verifyPositions(decoder, binary(
                 "000000000000004c08010000016818d500580009c28d9f1cb3757a00be00c60f0053000f06f0011503c80001011d00fc0007423799180053cdf80dce426f430f88190bb8560bb802f100005aa110002887e000010000ee8d"));