2 files changed, 11 insertions, 3 deletions
diff --git a/src/org/traccar/protocol/WristbandProtocol.java b/src/org/traccar/protocol/WristbandProtocol.java
index 632eb6a42..1e5ef2c01 100644
--- a/src/org/traccar/protocol/WristbandProtocol.java
+++ b/src/org/traccar/protocol/WristbandProtocol.java
@@ -16,7 +16,6 @@
 package org.traccar.protocol;
 
 import io.netty.handler.codec.LengthFieldBasedFrameDecoder;
-import io.netty.handler.codec.string.StringEncoder;
 import org.traccar.BaseProtocol;
 import org.traccar.PipelineBuilder;
 import org.traccar.TrackerServer;
@@ -28,7 +27,6 @@ public class WristbandProtocol extends BaseProtocol {
             @Override
             protected void addProtocolHandlers(PipelineBuilder pipeline) {
                 pipeline.addLast(new LengthFieldBasedFrameDecoder(1024, 3, 2, 3, 0));
-                pipeline.addLast(new StringEncoder());
                 pipeline.addLast(new WristbandProtocolDecoder(WristbandProtocol.this));
             }
         });
diff --git a/src/org/traccar/protocol/WristbandProtocolDecoder.java b/src/org/traccar/protocol/WristbandProtocolDecoder.java
index a19dcad31..3b1c6c2d4 100644
--- a/src/org/traccar/protocol/WristbandProtocolDecoder.java
+++ b/src/org/traccar/protocol/WristbandProtocolDecoder.java
@@ -16,6 +16,7 @@
 package org.traccar.protocol;
 
 import io.netty.buffer.ByteBuf;
+import io.netty.buffer.Unpooled;
 import io.netty.channel.Channel;
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.DeviceSession;
@@ -46,7 +47,16 @@ public class WristbandProtocolDecoder extends BaseProtocolDecoder {
 
         if (channel != null) {
             String sentence = String.format("YX%s|%s|0|{F%d#%s}\r\n", imei, version, type, data);
-            channel.writeAndFlush(new NetworkMessage(sentence, channel.remoteAddress()));
+            ByteBuf response = Unpooled.buffer();
+            if (type != 91) {
+                response.writeBytes(new byte[]{0x00, 0x01, 0x02});
+                response.writeShort(sentence.length());
+            }
+            response.writeCharSequence(sentence, StandardCharsets.US_ASCII);
+            if (type != 91) {
+                response.writeBytes(new byte[]{(byte) 0xFF, (byte) 0xFE, (byte) 0xFC});
+            }
+            channel.writeAndFlush(new NetworkMessage(response, channel.remoteAddress()));
         }
     }