Pushover

I’ve been using https://pushover.net/ https://pushover.net/ for this use case since forever.

If you want to try push notifications, I use https://pushover.net https://pushover.net as a service.

I like Pushover's protocol design: <https://pushover.net/api/client#websocket https://pushover.net/api/client#websocket>

If you need something similar that works on iOS (and Android), take a look at https://pushover.net/ https://pushover.net/ I use it for some personal automation scripts that might need to get my attention if something goes wrong.