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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.
@Stevie
@cool_acid: My ESP boards worked fine with the shim without any cap. Using the example. Except that the web server will get stuck if more than one request comes in at the same time. And of course the web client will get stuck after doing about 300 requests, most of the time. I have some auto-reset code catching that condition. None of that is the problem of the Pico, I am sure. The ESPs are notorious for these kinds of things.
But more general, in my experience those ESP boards are divas. They are cheap in more than one way. Sometimes they just don't work. Mine won't work with anything else than the Pico. For whatever reason, I don't know. Power? TX lines too long? No idea. Maybe yours just does not work. Do you have a second one to try?