add 下发指令

jetlinks-manager/device-manager/src/main/java/org/jetlinks/community/device/entity/DeviceDirectivesEntity.java

@@ -55,10 +55,14 @@ public class DeviceDirectivesEntity extends GenericEntity<String> {
     @Schema(description = "消息发送时间")
     private Long sendTimestamp;
 
-    @Comment("消息类型")
-    @Column(name = "message_type",nullable = false)
+
+    @Column(name = "message_type",length = 16)
     @EnumCodec
-    @JsonIgnore
+    @ColumnType(javaType = String.class)
+    @Schema(
+        description = "状态(只读)"
+        ,accessMode = Schema.AccessMode.READ_ONLY
+    )
     private MessageType messageType;
 
     @Comment("错误原因")