修改sn号重复注册问题

device-api/src/main/java/com/xy/dto/MqttUserDto.java

@@ -74,7 +74,6 @@ public class MqttUserDto {
         @ApiModelProperty("连接地址")
         private String ipAddress;
 
-        @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
         private Long serverTime;
 
         @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")