Serial#Find method for Arduino, implemented in Mbed

Adoption of https://www.arduino.cc/en/Serial/Find, implemented without use of interrupts or buffers. Note that it keeps the thread busy, so if you're running this in the background, better use Serial#attach with a buffer.

Changes

RevisionDateWhoCommit message
0:6228e490f311 2017-11-10 Jan Jongboom Initial commit, tested on K64F with ESP8266 module default tip