cannoSubDirPath
1.3.6.1.4.1.9.9.8888.1.1.1.1.1.6
This object specifies the directory path under the default
TFTP directory in the Announcement File server for
announcement files.
The individual characters in cannoSubDirPath may be
alphanumeric characters, forward slashes, backward slashes,
periods, dashes, and underscores, but no embedded spaces.
The last character of cannoSubDirPath must not be a dash.