Whatever these drones are they're smart enough to vanish once we try to tail them. It's likely not simply Iranian tech. Remember China and Iran are allies, and sharing technology. If China wanted to prove something to the USA, they could easily let Iran do it, simply to cause less of an "International Incident" if the truth comes out of what's going on. My hunch is that it's a Chinese Technology Demonstration, and the "mothership" might be nothing more than a cargo container on a cargo ship. That would go totally unnoticed by our military sensor arrays.