The documentation was wrong. The type we support is "binary" not hex.
Okayed on jabber.
<row><entry>Name</entry><entry>Meaning</entry></row>
</thead>
<tbody>
- <row><entry>hex</entry><entry>An arbitrary string of bytes, specified as a set of hexadecimal digits.</entry></row>
+ <row><entry>binary</entry><entry>An arbitrary string of bytes, specified as a set of hexadecimal digits.</entry></row>
<row><entry>boolean</entry><entry>Boolean value with allowed values true or false</entry></row>
<row><entry>empty</entry><entry>No value, data is carried in suboptions</entry></row>
<row><entry>fqdn</entry><entry>Fully qualified domain name (e.g. www.example.com)</entry></row>