Nut/OS Upgrade

Issues while upgrading from Nut/OS 4.9.10 to Nut/OS 5.1

RTC subsystem Additional argument (NUTRTC * rtc) in all functions prototypes defined in NUTRTC structure.

Code from 4.9 looks like:

rtc->rtc_gettime(&tm_temp);

Should be changed to:

rtc->rtc_gettime(rtc, &tm_temp);