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  • I've the same problem.
    after:

    var wifi = require("ESP8266WiFi").connect(Serial2, function(err)
    

    there is an Error:

    No 'ready' after AT+RST
    

    I can't see any red or blue LED on the esp8266 board.
    btw. I wonder that 5V is connected to the shim, but not connected to the esp8266 board. where does the power for the wifi module comes from ?

  • It takes the 3.3v supply from the pico - it's one of those 3 little pins on the side of the shim - make sure you soldered those.

    You need to put a ~1 uf+ cap between power and ground (there are pads for an SMD one on the shim), it seems like (at least in most cases) to get reliable operation. I've also found that sometimes it takes two tries to get AT+RST to work, if the ESP8266 isn't power cycled between attempts to use it.

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