Added sanity checking of received timestamp before using it.
Added millis() rollover protection in getEpochTime().
Added new function, setEpochTime(), to set NTPClient's internal currentEpoch from hardware RTC time.
Changed the default updateInterval to 1 hour.
Added 'Advanced_with_RTC' example to demonstrate new capabilities and accuracy.
The comment directs the reader to find a URL "above" for more information, but there is no such URL anywhere in the source code, and never was even when the comment was introduced to the repository on the first commit.
The NTPClient method update() has been changed to only return "TRUE" after a successful update. The following conditions return "FALSE":
- Interval duration requirement not met
- forceUpdate() times out
I added two functions:
```cpp
setTimeOffset(int timeOffset)
```
Allows you to set the offset at a later stage (e.g. upon timezone
changes or change from summertime to standard time)
```cpp
setUpdateInterval(int updateInterval)
```
Allows to set the interval at a later point. This was helpful when not
setting an offset at initialization and e.g. for other sync times during
special occasions.
