新增照片水印，将照片转为二进制前先打上水印

rain

2024-04-19 999c71172bc2135665bf84f5b345d59be01f28bb

 src/main/java/com/dji/sample/component/mqtt/model/TopicConst.java

@@ -34,4 +34,9 @@

    public static final String REGEX_SN = "[A-Za-z0-9]+";

    public static final String DRC = "/drc";

    public static final String UP = "/up";

    public static final String DOWN = "/down";
}