Implement UART abstraction layer
UART abstraction layer is needed by https://git.simvelop.de/aconnocustomers/lase/peoplecounterfw.
Also closes aconnocustomers/lase/peoplecounterfw#8.
UART abstraction layer is needed by https://git.simvelop.de/aconnocustomers/lase/peoplecounterfw.
Also closes aconnocustomers/lase/peoplecounterfw#8.