@the1laz thanks yes that makes some sense.
@Gordon On the subject of board design, having "tried" to solder shim to Pico it has occurred to me that a slightly longer Pico with the docking holes for the esp8266-01 would have been perfect. Just drop the legs in and solder the underside. Could even put pinheader in so removable. The design above obviously has to be fatter to accommodate the pads. And if only providing a wifi service to the board 01 would be fine the lack of Gpio not a factor, though I'm told the 12 style boards have better wifi range.
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