From d0d83fd1424b87fcba295676a0116cc61bf79767 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Sun, 17 Apr 2016 01:15:05 +1200
Subject: Only reply in TCP mode (fix #1836)

---
 src/org/traccar/protocol/T55ProtocolDecoder.java | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/org/traccar/protocol/T55ProtocolDecoder.java b/src/org/traccar/protocol/T55ProtocolDecoder.java
index c5704cd56..a71ef6b33 100644
--- a/src/org/traccar/protocol/T55ProtocolDecoder.java
+++ b/src/org/traccar/protocol/T55ProtocolDecoder.java
@@ -19,6 +19,7 @@ import java.net.SocketAddress;
 import java.util.Date;
 import java.util.regex.Pattern;
 import org.jboss.netty.channel.Channel;
+import org.jboss.netty.channel.socket.DatagramChannel;
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.helper.DateBuilder;
 import org.traccar.helper.Parser;
@@ -92,7 +93,7 @@ public class T55ProtocolDecoder extends BaseProtocolDecoder {
 
     private Position decodeGprmc(String sentence, SocketAddress remoteAddress, Channel channel) {
 
-        if (channel != null) {
+        if (channel != null && !(channel instanceof DatagramChannel)) {
             channel.write("OK1\r\n");
         }
 
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