diff --git a/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/executor/D331RtcmMessageExecutor.java b/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/executor/D331RtcmMessageExecutor.java
index 04dcb8f1..de157746 100644
--- a/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/executor/D331RtcmMessageExecutor.java
+++ b/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/executor/D331RtcmMessageExecutor.java
@@ -56,6 +56,9 @@ public class D331RtcmMessageExecutor implements Executor<D331RtcmMessage, Void>
                 if(deviceId.equals("2419385")){
                     DeviceChannel channel = OnlineChannels.INSTANCE.getConfigChannel(deviceId);
                     if(channel != null && channel.isOnline()){
+                        if (logger.isDebugEnabled()) {
+                            logger.debug("forward d331 rtcm message to device {} tcp", deviceId);
+                        }
                         ByteBuf buf = Unpooled.buffer();
                         buf.writeBytes(forwardBytes);
                         channel.writeAndFlush(buf);