Add mg_now() to sntp.c

examples/mqtt-dashboard/device/net.c

@@ -20,11 +20,6 @@ struct device_config {
 };
 
 static struct device_config s_device_config;
-static uint64_t s_boot_timestamp = 0;  // Updated by SNTP
-
-uint64_t mg_now(void) {
-  return mg_millis() + s_boot_timestamp;
-}
 
 // Device ID generation function. Create an ID that is unique
 // for a given device, and does not change between device restarts.
@@ -277,26 +272,11 @@ static void timer_ping(void *arg) {
   (void) arg;
 }
 
-// SNTP connection event handler. When we get a response from an SNTP server,
-// adjust s_boot_timestamp. We'll get a valid time from that point on
-static void sntp_ev_handler(struct mg_connection *c, int ev, void *ev_data) {
-  uint64_t *expiration_time = (uint64_t *) c->data;
-  if (ev == MG_EV_OPEN) {
-    *expiration_time = mg_millis() + 3000;  // Store expiration time in 3s
-  } else if (ev == MG_EV_SNTP_TIME) {
-    uint64_t t = *(uint64_t *) ev_data;
-    s_boot_timestamp = t - mg_millis();
-    c->is_closing = 1;
-  } else if (ev == MG_EV_POLL) {
-    if (mg_millis() > *expiration_time) c->is_closing = 1;
-  }
-}
-
 static void timer_sntp(void *param) {  // SNTP timer function. Sync up time
   static uint64_t hourly_timer = 0;
-  if (s_boot_timestamp == 0 ||
-      mg_timer_expired(&hourly_timer, 3600000, mg_millis())) {
-    mg_sntp_connect(param, "udp://time.google.com:123", sntp_ev_handler, NULL);
+  uint64_t t1 = mg_now(), t2 = mg_millis();
+  if (t1 < t2 + 3600 || mg_timer_expired(&hourly_timer, 3600000, t2)) {
+    mg_sntp_connect(param, "udp://time.google.com:123", NULL, NULL);
   }
 }