Expand Up @@ -64,8 +64,9 @@ static time_t now; static uint32_t now_ms, now_us;
static esp8266::polledTimeout::periodicMs showTimeNow(60000); static int time_machine_days = 0; // 0 = now static int time_machine_days = 0; // 0 = present static bool time_machine_running = false; static bool time_machine_run_once = false;
// OPTIONAL: change SNTP startup delay // a weak function is already defined and returns 0 (RFC violation) Expand Down Expand Up @@ -112,7 +113,7 @@ void showTime() { // time from boot Serial.print("clock: "); Serial.print((uint32_t)tp.tv_sec); Serial.print("s / "); Serial.print("s + "); Serial.print((uint32_t)tp.tv_nsec); Serial.println("ns");
Expand All @@ -125,7 +126,7 @@ void showTime() { // EPOCH+tz+dst Serial.print("gtod: "); Serial.print((uint32_t)tv.tv_sec); Serial.print("s / "); Serial.print("s + "); Serial.print((uint32_t)tv.tv_usec); Serial.println("us");
Expand All @@ -140,7 +141,7 @@ void showTime() { Serial.print("ctime: "); Serial.print(ctime(&now));
// LwIP v2 is able to list more details about the currently configured SNTP servers // 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); Expand All @@ -151,48 +152,67 @@ void showTime() { } else { Serial.printf("%s ", sntp.toString().c_str()); } Serial.printf("IPv6: %s Reachability: %o\n", Serial.printf("- IPv6: %s - Reachability: %o\n", sntp.isV6() ? "Yes" : "No", sntp_getreachability(i)); } }
Serial.println();
// subsecond synchronisation gettimeofday(&tv, nullptr); time_t sec = tv.tv_sec; do { // show subsecond synchronisation timeval prevtv; time_t prevtime = time(nullptr); gettimeofday(&prevtv, nullptr);
while (true) { gettimeofday(&tv, nullptr); Serial.printf("time(): %u gettimeofday(): %u.%06u", (uint32_t)time(nullptr), (uint32_t)tv.tv_sec, (uint32_t)tv.tv_usec); if (tv.tv_sec == sec) { Serial.println(" second unchanged"); } else { Serial.println(" <-- second changed"); if (tv.tv_sec != prevtv.tv_sec) { Serial.printf("time(): %u gettimeofday(): %u.%06u seconds are unchanged\n", (uint32_t)prevtime, (uint32_t)prevtv.tv_sec, (uint32_t)prevtv.tv_usec); Serial.printf("time(): %u gettimeofday(): %u.%06u <-- seconds have changed\n", (uint32_t)(prevtime = time(nullptr)), (uint32_t)tv.tv_sec, (uint32_t)tv.tv_usec); break; } prevtv = tv; delay(50); } while (tv.tv_sec == sec); }
Serial.println(); }
void time_is_set_scheduled() { // everything is allowed in this function void time_is_set(bool from_sntp /* <= this parameter is optional */) { // in CONT stack, unlike ISRs, // any function is allowed in this callback
if (time_machine_days == 0) { time_machine_running = !time_machine_running; if (time_machine_running) { time_machine_run_once = true; time_machine_running = false; } else { time_machine_running = from_sntp && !time_machine_run_once; } if (time_machine_running) { Serial.printf("\n-- \n-- Starting time machine demo to show libc's " "automatic DST handling\n-- \n"); } }
Serial.print("settimeofday("); if (from_sntp) { Serial.print("SNTP"); } else { Serial.print("USER"); } Serial.print(")");
// time machine demo if (time_machine_running) { if (time_machine_days == 0) Serial.printf("---- settimeofday() has been called - possibly from SNTP\n" " (starting time machine demo to show libc's automatic DST handling)\n\n"); now = time(nullptr); const tm* tm = localtime(&now); Serial.printf("future=%3ddays: DST=%s - ", Serial.printf(": future=%3ddays: DST=%s - ", time_machine_days, tm->tm_isdst ? "true " : "false"); Serial.print(ctime(&now)); Expand All @@ -207,49 +227,55 @@ void time_is_set_scheduled() { } settimeofday(&tv, nullptr); } else { showTime(); Serial.println(); } }
void setup() { WiFi.persistent(false); WiFi.mode(WIFI_OFF);
Serial.begin(115200); Serial.println("\nStarting...\n"); Serial.println("\nStarting in 2secs...\n"); delay(2000);
// install callback - called when settimeofday is called (by SNTP or user) // once enabled (by DHCP), SNTP is updated every hour by default // ** optional boolean in callback function is true when triggerred by SNTP ** settimeofday_cb(time_is_set);
// setup RTC time // it will be used until NTP server will send us real current time Serial.println("Manually setting some time from some RTC:"); time_t rtc = RTC_UTC_TEST; timeval tv = { rtc, 0 }; settimeofday(&tv, nullptr);
// install callback - called when settimeofday is called (by SNTP or us) // once enabled (by DHCP), SNTP is updated every hour settimeofday_cb(time_is_set_scheduled);
// 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"); // <---- // Replace MYTZ by a value from TZ.h (search for this file in your filesystem).
// 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 // 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)
// Give now a chance to the settimeofday callback, // because it is *always* deferred to the next yield()/loop()-call. yield();
// start network WiFi.persistent(false); WiFi.mode(WIFI_STA); WiFi.begin(STASSID, STAPSK);
// don't wait for network, observe time changing // when NTP timestamp is received Serial.printf("Time is currently set by a constant:\n"); showTime(); }
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