fix: ignore computer sleep for telemetry clock (#577)

* fix: ignore computer sleep for telemetry clock

This uses unix time with regular integer comparisons to prevent the
telemetry clock from needing to wait for 8 hours of the program running.
Now, it only needs to wait 8 real-time hours instead.

* drop telemetry time to 4 hours, tick every 10 minutes

wavesrv/cmd/main-server.go

@@ -67,8 +67,8 @@ const WSStateReconnectTime = 30 * time.Second
 const WSStatePacketChSize = 20
 
 const InitialTelemetryWait = 30 * time.Second
-const TelemetryTick = 30 * time.Minute
+const TelemetryTick = 10 * time.Minute
-const TelemetryInterval = 8 * time.Hour
+const TelemetryInterval = 4 * time.Hour
 
 const MaxWriteFileMemSize = 20 * (1024 * 1024) // 20M
 
@@ -930,12 +930,11 @@ func checkNewReleaseWrapper() {
 }
 
 func telemetryLoop() {
-	var lastSent time.Time
+	var nextSend int64
 	time.Sleep(InitialTelemetryWait)
 	for {
-		dur := time.Since(lastSent)
+		if time.Now().Unix() > nextSend {
-		if lastSent.IsZero() || dur >= TelemetryInterval {
+			nextSend = time.Now().Add(TelemetryInterval).Unix()
-			lastSent = time.Now()
 			sendTelemetryWrapper()
 			checkNewReleaseWrapper()
 		}