There is now a mirror where we have uploaded the missing packages.
To enable it, add the following lines to your project's local.conf file.
INHERIT += "own-mirrors"
SOURCE_MIRROR_URL = "ftp://ftp1.digi.com/support/digiembeddedyocto/mirror/"
Then to be safe, clean previous attempt of downloading the missing packages:
bitbake -c cleanall crda
And now you can bitbake dey-image-minimal again. It should get the missing packages from the mirror.