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configTime(tzsec,dstsec,): fix UTC/local management (#6993)

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* configTime(tzsec,dstsec,): fix UTC/local management
This PR also remove dead code since probably newlib updates
The NTP-TZ-DST example is also updated
* restore sntp_set_timezone_in_seconds()
fixes #6678
* +configTzTime()
This commit is contained in:
david gauchard
2020-02-18 16:39:38 +01:00
committed by GitHub
parent e752e96e9f
commit f066ed2495
6 changed files with 86 additions and 392 deletions
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16
libraries/esp8266/examples/NTP-TZ-DST/NTP-TZ-DST.ino
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@ -134,13 +134,14 @@ void showTime() {
Serial.println((uint32_t)now);
// timezone and demo in the future
Serial.printf("timezone: %s\n", MYTZ);
Serial.printf("timezone: %s\n", getenv("TZ"));
// human readable
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);
@ -203,8 +204,7 @@ void setup() {
// it will be used until NTP server will send us real current time
time_t rtc = RTC_UTC_TEST;
timeval tv = { rtc, 0 };
timezone tz = { 0, 0 };
settimeofday(&tv, &tz);
settimeofday(&tv, nullptr);
// install callback - called when settimeofday is called (by SNTP or us)
// once enabled (by DHCP), SNTP is updated every hour
@ -212,8 +212,18 @@ void setup() {
// NTP servers may be overriden by your DHCP server for a more local one
// (see below)
// ----> Here is the ONLY ONE LINE needed in your sketch
configTime(MYTZ, "pool.ntp.org");
// Here is the ONLY ONE LINE needed in your sketch <----
// pick a value from TZ.h (search for this file in your filesystem) for MYTZ
// former configTime is still valid, here is the call for 7 hours to the west
// with an enabled 30mn DST
//configTime(7 * 3600, 3600 / 2, "pool.ntp.org");
// OPTIONAL: disable obtaining SNTP servers from DHCP
//sntp_servermode_dhcp(0); // 0: disable obtaining SNTP servers from DHCP (enabled by default)