NUSPacker Wii U

NUSPacker is an open-source tool written in Jave that can package files into an installable format for the Wii U.

User guide

Set up a folder containing "code," "content," and "meta" folders. Make sure that the content folder is not empty.

Optionally, create an "encryptKeyWith" text file and add the common key as a hexstring (32 characters) for encryption.

To pack files, use these arguments:

-in - Directory with decrypted data (root folder with code, content, and meta).
-out - Destination for the installable package.

Optional, will be parsed from app.xml if missing:

Optional, defaults values will be used if missing (or loaded from external file):

Example command (make sure to have a valid app.xml):

java -jar NUSPacker.jar -in "inputDir" -out "outputDir"

Example command without common key stored in file:

java -jar NUSPacker.jar -in "inputDir" -out "outputDir" -encryptKeyWith 12345678123456781234567812345678

To create a channel out of an .rpx you need valid .xml files and meta data. This tool is just packing everything together.
Don't use ddd dumps - The code folder is not working. Redump/get the code folder without ddd.
You need signature patches (ie. Mocha, Haxchi, CHBC or Signature Patcher) to be able to install the created packages.

[Wii U] Dumping, Extracting & Repacking Wii U Disc Games [wudump, JWUDTool & NUSPacker Tutorial] (BullyWiiPlaza)