Hi, I think that someone could find this usefull.
I have been getting problems with SoftwareSerial and ESP8266 package version. (i am using a wemos d1 mini board for test). Trying enroll sketch, It seems that it can detect the fingerprint sensor, but after that ... "comunication error"
Software Serial is NOT working with 2.5.1 package version.
I have read in severalweb pages that we have to use 2.4 packages.
I will try 2.5.2 package version and write down here.
Update: 2.5.2 also not working with Software Serial