{ntfy} is now on CRAN #rstats  

https://CRAN.R-project.org/package=ntfy

The README on the GitHub repo contains the most thorough walkthrough

https://github.com/jonocarroll/ntfy

tl;dr send messages to a channel on-demand or when some code completes, including emoji and plot outputs. No sign-up, no fees, no subscription, and minimal dependencies.

ntfy: Lightweight Wrapper to the 'ntfy.sh' Service

The 'ntfy' (pronounce: notify) service is a simple HTTP-based pub-sub notification service. It allows you to send notifications to your phone or desktop via scripts from any computer, entirely without signup, cost or setup. It's also open source if you want to run your own. Visit <<a href="https://ntfy.sh" target="_top">https://ntfy.sh</a>> for more details.

@jonocarroll Thanks! It's been in production for 200 days already! It sends me daily messages to my mobile phone about tomorrow's electric price. It is simple and works very well.
@jonocarroll This ntfy thing is dangerously addictive 😅. I might or might not have enthusiastically added notifications all over my processing pipelines yesterday (mostly in bash scripts and Python, but R will come 😅) and now it has gotten a bit out of control... 🙈