This is actually a problem with the Openembedded git submodule, but it will stop CoreCDP from building. The solution is simple.
Edit corecdp/openembedded/recipes/netbase/netbase_4.21.bb:
Change the SRC_URI line from this:
http://developer.irexnet.com/pub/iOn/Sources/1.0/Third%20party/all/netbase-${PV}.tar.gz \
to this:
http://downloads.yoctoproject.org/mirror/sources/netbase-${PV}.tar.gz \
I’m not exactly sure how to do a pull request back to the openembedded project to fix this. If anyone else knows, I’ll do it.