Perhaps the most straightforward would be to use an esp8266-01 module for each pico, although if all were in station mode, you would need a central router to talk to. If there were in ap mode, you would have to connect to each one in turn to send updates.
You possible could have one in ap mode, and have the other unit and your phone connect to that ap, so that everything is on the same network.
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.
Perhaps the most straightforward would be to use an esp8266-01 module for each pico, although if all were in station mode, you would need a central router to talk to. If there were in ap mode, you would have to connect to each one in turn to send updates.
You possible could have one in ap mode, and have the other unit and your phone connect to that ap, so that everything is on the same network.