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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.
@Gordon
@RandyHarmon does your module flash when you plug the Pico into USB as well?
The flash is pretty standard behaviour for ESP8266 - it's just transmitting a 'hello world' sort of message when it boots.
So then I guess the issue is why it's not doing anything when the Espruino is sending data to it - I'd definitely check out the RX and TX wires are connected and not shorted.