Actually I have not received the modules yet but I'm playing around w/ Arduino IDE configured for the ESP8266 HUZZAH board and the Fingerprint sensor HARDWARE-serial library.
If I include the library (#include <Adafruit_Fingerprint.h>) in an empty sketch and compile I get an error:
..../libraries/Adafruit_Fingerprint/Adafruit_Fingerprint.cpp:18:24: fatal error: util/delay.h: No such file or directory
#include <util/delay.h>
Is there a workaround for this?
I also realised that the SoftwareSerial library is not available in the HUZZAH :/
Best regards, L