Hallo,
ich habe das fertige Sketch zu NTP vom ESP32 library genommen. Das funktioniert soweit auch - die Zeitabfrage passt.
Wie bekomme ich die einzelnen Werte für zB H, M und S in eigene Variablen, damit ich das weiterverwenden kann. (zur Hochrechnung der Zeit mit der Laufzeit des ESP - man soll den NTP Server lt Info nicht dauernd abfragen)
void printLocalTime()
{
struct tm timeinfo;
if(!getLocalTime(&timeinfo)){
Serial.println("No time available (yet)");
return;
}
//Serial.println(&timeinfo, "%A, %B %d %Y %H:%M:%S"); // %A = Tag mit Namen - zB Montag
Serial.print("ZEITABFRAGE: ");
Serial.println(&timeinfo, "%B %d %Y %H:%M:%S");
} // end void
Serial Monitor ergibt:
January 09 2024 00:54:07
Der gesamte Sketch aus dem ESP library:
#include <WiFi.h>
#include "time.h"
#include "sntp.h"
const char* ssid = "YOUR_SSID";
const char* password = "YOUR_PASS";
const char* ntpServer1 = "pool.ntp.org";
const char* ntpServer2 = "time.nist.gov";
const long gmtOffset_sec = 3600;
const int daylightOffset_sec = 3600;
const char* time_zone = "CET-1CEST,M3.5.0,M10.5.0/3"; // TimeZone rule for Europe/Rome including daylight adjustment rules (optional)
void printLocalTime()
{
struct tm timeinfo;
if(!getLocalTime(&timeinfo)){
Serial.println("No time available (yet)");
return;
}
Serial.println(&timeinfo, "%A, %B %d %Y %H:%M:%S");
}
// Callback function (get's called when time adjusts via NTP)
void timeavailable(struct timeval *t)
{
Serial.println("Got time adjustment from NTP!");
printLocalTime();
}
void setup()
{
Serial.begin(115200);
// set notification call-back function
sntp_set_time_sync_notification_cb( timeavailable );
/**
* NTP server address could be aquired via DHCP,
*
* NOTE: This call should be made BEFORE esp32 aquires IP address via DHCP,
* otherwise SNTP option 42 would be rejected by default.
* NOTE: configTime() function call if made AFTER DHCP-client run
* will OVERRIDE aquired NTP server address
*/
sntp_servermode_dhcp(1); // (optional)
/**
* This will set configured ntp servers and constant TimeZone/daylightOffset
* should be OK if your time zone does not need to adjust daylightOffset twice a year,
* in such a case time adjustment won't be handled automagicaly.
*/
configTime(gmtOffset_sec, daylightOffset_sec, ntpServer1, ntpServer2);
/**
* A more convenient approach to handle TimeZones with daylightOffset
* would be to specify a environmnet variable with TimeZone definition including daylight adjustmnet rules.
* A list of rules for your zone could be obtained from https://github.com/esp8266/Arduino/blob/master/cores/esp8266/TZ.h
*/
//configTzTime(time_zone, ntpServer1, ntpServer2);
//connect to WiFi
Serial.printf("Connecting to %s ", ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println(" CONNECTED");
}
void loop()
{
delay(5000);
printLocalTime(); // it will take some time to sync time :)
}
