It's described in the link above.
Short answer is: if you're not happy opening the watch, the hoops you have to jump through to program wirelessly are going to be too painful as well.
@Gordon started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
It's described in the link above.
Short answer is: if you're not happy opening the watch, the hoops you have to jump through to program wirelessly are going to be too painful as well.