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@Gordon
I'm afraid we'd need more information... Have you checked with
NRF Connectto ensure that the ESP32 is actually advertising the right stuff?If so,
NRF.findDevices/requestDevice/setScanshould all return an object that contains the BLE advertising data from a BLE device - things like service data should be decoded automatically - check the reference: http://www.espruino.com/Reference#l_NRF_findDevices