PiNTP

 A lightweight SNTP time synchronization client for Raspberry Pi
 computers (ideal for the Pi 3B+, which has no hardware RTC).
 Synchronizes or displays the current time over UDP port 123.

 REQUIREMENTS:

 - AROS aarch64 with a running TCP/IP stack (AROSTCP) providing
   bsdsocket.library
 - A configured network interface with a default route (e.g.
   Devs:Networks/bcmgenet.device on the Pi 3B+)
 - A working DNS configuration ONLY if you use hostnames (see
   TROUBLESHOOTING); server IPs can be used directly, sidestepping
   DNS entirely

 FEATURES:

 - SNTP protocol (RFC 4330, UDP port 123), client mode, NTPv4 (VN=4)
 - Query any NTP server, by hostname or IP
 - Set the AROS software clock from the response (-s); works through
   the CLI 'Date' command (timer.device), since AROS settimeofday()
   is not implemented
 - Timezone support with -z (seconds or +/-HH[:MM] forms)
 - Auto-detects timezone from ENV:TZ or AROS locale (loc_GMTOffset)
 - Validates replies: packet length, server mode, synchronization
   status, Kiss-of-Death (stratum 0) and zero timestamps
 - Verbose mode shows the resolved server IP, NTP stratum and timestamps


 USAGE:

 From CLI:

   PiNTP                              ; query pool.ntp.org, show time
   PiNTP -s                           ; query and set system clock
   PiNTP -s 162.159.200.123           ; query a server by IP (no DNS)
   PiNTP -s -z 3600                   ; set clock for UTC+1 (CET)
   PiNTP -v pool.ntp.org              ; verbose, show resolved IP


 OPTIONS:

   -s            Set system clock from NTP response
   -z <offset>   Timezone offset from UTC in SECONDS (e.g. 3600,
                 -18000, 19800) or as +/-HH[:MM] (e.g. +1, -5, +5:30)
                 Overrides ENV:TZ / locale auto-detection
   -v            Verbose output (resolved IP, NTP details)
   -h            Show help
   [server]      NTP server: hostname or dotted-quad IP address.
                 Default: pool.ntp.org

 NOTE on timezones: AROS locale provides a fixed offset and no DST
 rules. If you need daylight saving, use '-z' or set ENV:TZ.


 TROUBLESHOOTING:

 - "Failed to send data: Permission denied" (EACCES): the AROSTCP
   resolver marks unresolvable hostnames with the broadcast address
   255.255.255.255 (or 0.0.0.0), and AROSTCP refuses to send to a
   broadcast address. Fix the DNS configuration in
   System:Network/AROSTCP/db/netdb-myhost (NAMESERVER <router/gateway
   IP>) and restart the stack, or simply pass a server IP address:
   'PiNTP -s 162.159.200.123'
 - Timeout waiting for NTP response: the NTP server or port 123 is
   unreachable from your network. Check the route with 'netstat -r'
   and try a different server.


 LICENSE:

 Freeware. Use at your own risk.