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Expand NTP-TZ-DST example to list SNTP servers (#6611)

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This change expands the NTP-TZ-DST example to list the active
SNTP servers. It lists the IP address server name (if used) and
reachability in ntpq style octal format.

Tests:
 - Build against all LwIP stack configurations and correct
   operation with a single SNTP server
 - Vary connectivity to an SNTP server and check reachability
   updates
 - Configure 3 SNTP servers by name
 - With a patched LwIP stack that supports simultaneous DHCP
   and DHCPv6 SNTP servers check that all server details are
   listed and update correctly during operation
This commit is contained in:
David J. Fiddes 2019-10-08 16:41:42 +01:00 committed by Earle F. Philhower, III
parent 8c3f1be63f
commit d3debb64c9
1 changed files with 19 additions and 0 deletions
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19
libraries/esp8266/examples/NTP-TZ-DST/NTP-TZ-DST.ino
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@ -130,6 +130,25 @@ void showTime() {
Serial.print("ctime: ");
Serial.print(ctime(&now));
#if LWIP_VERSION_MAJOR > 1
// LwIP v2 is able to list more details about the currently configured SNTP servers
for (int i = 0; i < SNTP_MAX_SERVERS; i++) {
IPAddress sntp = *sntp_getserver(i);
const char* name = sntp_getservername(i);
if (sntp.isSet()) {
Serial.printf("sntp%d: ", i);
if (name) {
Serial.printf("%s (%s) ", name, sntp.toString().c_str());
} else {
Serial.printf("%s ", sntp.toString().c_str());
}
Serial.printf("IPv6: %s Reachability: %o\n",
sntp.isV6() ? "Yes" : "No",
sntp_getreachability(i));
}
}
#endif
Serial.println();
}