Well, i tried with 12Ml poly scene and no problems here.
The connection works still you don't export (the entire scene) to HDLS via FBX or alembic but that's not Corona fault..it's the plugin or memory problem imho...in the end hdls crashes.
Exporting to Collada (i'm used with this ;) ) and then inporting to HDLS instead of using the export inside the connection plugin, i can confirm it works like a charm.