diff --git a/src/main/java/a8k/canbus/A8kCanBusService.java b/src/main/java/a8k/canbus/A8kCanBusService.java
index 5cc2733..76f0060 100644
--- a/src/main/java/a8k/canbus/A8kCanBusService.java
+++ b/src/main/java/a8k/canbus/A8kCanBusService.java
@@ -653,6 +653,7 @@ public class A8kCanBusService {
 				Thread.sleep(100);
 			} catch (InterruptedException ignore) {
 			}
+			logger.error("send cmd {} fail, retry {}", pack, i);
 		}
 		throw new HardwareException(MId.valueOf(pack.getModuleId()), A8kEcode.Overtime);
 	}