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 b9003706..aa69358a 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
@@ -73,6 +73,8 @@ public class D331RtcmMessageExecutor implements Executor<D331RtcmMessage, Void>
             if(device1.getLastD3f0f2Time() == null ||
                     device1.getLastD3f0f2Time().isBefore(now.minusMinutes(30))) {
                 // new cycle
+                logger.info("device {} rx {} d331 in a cycle while not d3f0f2",device1.getDeviceId(),device1.getD3xxCount());
+
                 Device lastCycleDevice = new Device();
                 lastCycleDevice.setDeviceId(device1.getDeviceId());
                 lastCycleDevice.setTenantId(device1.getTenantId());