Hi there, I'm the author of mosquitto. I'd just like to point out that some of the MQTT features you might want to use aren't in mosquitto yet - specifically client authentication and access control lists as added in v3.1 of the MQTT spec. They'll be in the next release, but if you can't wait that long they are supported in the IBM "free for evaluation" broker, rsmb. Mosquitto uses the same config file format as rsmb, so you'll be able to swap between them. I'm also keen on making sure mosquitto can run on more restricted/unusual devices - so if you need help getting it on a dd-wrt router or similar then feel free to get in touch. It's good to hear interest in MQTT for this kind of application - it's exactly the situation its suited for. Best of luck! Cheers, Roger