I created an installer with the following command:
../../bin/binarycreator -c config/config.xml --online-only online_installer
My config file is very basic and basically has an entry to the url where my repository is stored. I intentionally clear the "packages" sub-folder (for this step) to ensure the contents were not being included by error.
I went ahead and created a repository with repogen in the following way:

../../bin/repogen -p packages/ -c config/config.xml -i com.vendor.product,com.vendor.product.updated rep_last

I also tried the simpler version..
../../bin/repogen -p packages/ -c config/config.xml rep_last

Once the repository is created, I see the 7zip files and "Updates.xml." It is my understanding from documentation that these are the files to be updated to my url. When running the installer, it connects to the server, fetches the package data, but fails to extract. I'm attaching the installation log for your reference.

Just for uniformity in my testing, I attempted the same steps with the installer framework build provided in:

http://builds.qt-project.org/view/Installer%20Framework/job/ifw-unix/lastSuccessfulBuild/label=ubuntu64-builder-1004/

In general,I don't perceive a problem in the installer(produced by binarycreator) or network settings...but I can't really point out what wrong with the repogen instructions...

Any help is appreciated,

Gabriel