- Fail setup, instead of underflowing, when max_packet_size leaves the
encryption or session layer no room
- Warn when the boot number cannot be saved
- Warn once when the peer's packets carry an older boot number, which
happens when its flash is erased
- Test the counter wrapping to a new boot number
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The session layer sends keep-alives and reports whether the peer can be
reached, including after it restarts or a reliability layer below loses
data. The encryption layer encrypts and checks each packet with XXTEA,
with an optional rolling code against replays. Components that a layer
needs, such as binary_sensor, are loaded only when it is configured.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
