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Export boot timestamp, update docs and examples to use it

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cpq committed 2026-06-01 14:35:06 +01:00
1 parent 987075189d
commit 5ae35e3812
11 files changed
+177 -207
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src/sntp.c
+5 -4
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@@ -7,10 +7,10 @@
#define SNTP_TIME_OFFSET 2208988800U // (1970 - 1900) in seconds
#define SNTP_MAX_FRAC 4294967295.0 // 2 ** 32 - 1
static uint64_t s_boot_timestamp = 0; // Updated by SNTP
uint64_t mg_boot_timestamp_ms = 0; // Updated by SNTP
uint64_t mg_now(void) {
return mg_millis() + s_boot_timestamp;
return mg_millis() + mg_boot_timestamp_ms;
}
static int64_t gettimestamp(const uint32_t *data) {
@@ -37,7 +37,7 @@ int64_t mg_sntp_parse(const unsigned char *buf, size_t len) {
int64_t now = (int64_t) mg_millis();
int64_t latency = (now - origin_time) - (transmit_time - receive_time);
epoch_milliseconds = transmit_time + latency / 2;
s_boot_timestamp = (uint64_t) (epoch_milliseconds - now);
mg_boot_timestamp_ms = (uint64_t) (epoch_milliseconds - now);
} else {
MG_ERROR(("unexpected version: %d", version));
}
@@ -53,7 +53,7 @@ static void sntp_cb(struct mg_connection *c, int ev, void *ev_data) {
} else if (ev == MG_EV_READ) {
int64_t milliseconds = mg_sntp_parse(c->recv.buf, c->recv.len);
if (milliseconds > 0) {
s_boot_timestamp = (uint64_t) milliseconds - mg_millis();
mg_boot_timestamp_ms = (uint64_t) milliseconds - mg_millis();
mg_call(c, MG_EV_SNTP_TIME, (uint64_t *) &milliseconds);
MG_DEBUG(("%lu got time: %lld ms from epoch", c->id, milliseconds));
}
@@ -86,3 +86,4 @@ struct mg_connection *mg_sntp_connect(struct mg_mgr *mgr, const char *url,
if (url == NULL) url = "udp://time.google.com:123";
return mg_connect_svc(mgr, url, fn, fn_data, sntp_cb, NULL);
}