My guess is I'd use Deno on the client side so I could stay in JavaScript land (I like it... have reasons... don't judge me).

anyway... It looks like Deno can handle the above... there was a closed GitHub issue, but I can't see it. FU Github... but, I know you are a for-profit company, so fair is fair. I post all my code on floppypng.com CC0, so I don't fall in that trap. I can't believe how people that are supposedly maximalist freedom meme adherents are still mostly on github.

But, again... that is a future life... I've been 12 hours a day, 7 days a week (mostly) since May of 2019 working on Logical Map and related. When that gets more sane, I'm not so sure I'll have the inclination to bring up an MQTT server to do this.