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select the UDP payload and then select "decode as", but CCSDS is not in the list

What did you do to get the list?

Unless you have a really old version, you need to:

• select the packet;
• select Analyze > Decode As...;
• click the + button;
• double-click the value in the "Current" column for the newly-added row (it probably says "(none)");
• clock the button on the right with "^" above "v".

That list shows CCSDS in the version of Wireshark I have.