A tiny command-line tool that serves a web page with a big button that says READY. Until the button is pressed, the process will not exit.
This lets you do neat things, like running
ready on your laptop,
&&-chained to a command you want to run at some time in the near future.
$ ready && picast video.mp4
You can run this command, walk off with your phone or tablet or friend's computer, and when you're ready, visit http://10.0.0.10:3210 (or whatever your local ip is), tap READY, and the video will start playing on the TV (in this case, using picast.
npm i -g web-ready