The iron and blanket aren't 'internet of' thing's, they're things that have modest processing power added. The iron isn't talking to the blanket, or light bulb, or any of the other yet to be discovered use cases we all know are the next big thing, yet nobody's found. You'll end up making an iron with an extra component to fail at higher cost and which will not be compatible with the next generations parts.
Remember programming the VCR with barcodes? Exactly.