3.1.0

Bug fixes, native tests + compile CI, docs, and a lighter AVR footprint. Fully backward compatible with 3.0.0.

Fixes

• syncRFC3339(): correct dates in leap years (previously rendered the wrong month/day).
• NTP examples now link on AVR (out-of-line definition of NTP_PACKET, gnu++11).
• _hasResponse(): fixed signed/unsigned comparison that could accept an error packet.
• getElapsedTimeInMillis(): now compiles and no longer overflows.
• offline example: guard LED_BUILTIN (undefined on the generic esp32 board).

AVR footprint

• Date conversion stays at 2 × 16-bit divisions (no 32-bit division).
• NTP_PACKET moved to PROGMEM: −48 bytes of RAM.

API

• getTimestampRFC3339() unchanged (returns String).
• New c_str(): zero-allocation timestamp access.

Tooling

• Native unit tests (-Werror) + GitHub Actions compiling examples on AVR / ESP8266 / ESP32.

3.0.0

Merge pull request #10 from 1e1/develop

major: manage itself the UDP

2.0.2: Merge pull request #9 from 1e1/develop

fix: don't update the timestamp if the NTP response has no timestamp

2.0.1: Merge pull request #8 from 1e1/develop

fix: syncRFC3339