Even though the iRobot line of smart vacuums doesn't support Apple HomeKit, there is a way to control your iRobot Roomba with Siri. It's not as simple as downloading an app and pushing a button, but it's not overly complex either. If you're in a tinkering mood, then you're going to have a blast, and in about 10 minutes, you should be able to command your Roomba using Siri, or actions programmed into the Shortcuts app on your iPhone.
How to control your Roomba with Siri
