Use monotonic clock for SDR/network timing.

#174.

main/network.go

@@ -209,7 +209,7 @@ func messageQueueSender() {
 				}
 			}
 
-			if time.Since(lastQueueTimeChange) >= 5*time.Second {
+			if stratuxClock.Since(lastQueueTimeChange) >= 5*time.Second {
 				var pd float64
 				if averageSendableQueueSize > 0.0 && len(outSockets) > 0 {
 					averageSendableQueueSize = averageSendableQueueSize / float64(len(outSockets))  // It's a total, not an average, up until this point.
@@ -219,7 +219,7 @@ func messageQueueSender() {
 				}
 				queueTimer.Stop()
 				queueTimer = time.NewTicker(time.Duration(pd*1000000000.0) * time.Nanosecond)
-				lastQueueTimeChange = time.Now()
+				lastQueueTimeChange = stratuxClock.Time
 			}
 			netMutex.Unlock()
 		case <-secondTimer.C:

main/sdr.go

@@ -277,7 +277,7 @@ var devMap = map[int]string{0: "", 1: ""}
 func sdrWatcher() {
 	stopCheckingUATUntil := time.Time{}
 
-	lastUATCheck := time.Now()
+	lastUATCheck := stratuxClock.Time
 
 	for {
 		time.Sleep(1 * time.Second)
@@ -322,20 +322,20 @@ func sdrWatcher() {
 		// UAT specific handling
 
 		// Shutdown UAT for 50 seconds, check every 60 seconds if the count is 0.
-		if time.Since(lastUATCheck) >= 1*time.Minute {
+		if stratuxClock.Since(lastUATCheck) >= 1*time.Minute {
 			if UATDev != nil && globalStatus.UAT_messages_last_minute == 0 {
 				log.Printf("Pausing UAT listening for 50 seconds - none received.\n")
 				UATDev.shutdown()
 				UATDev = nil
-				stopCheckingUATUntil = time.Now().Add(50 * time.Second)
+				stopCheckingUATUntil = stratuxClock.Time.Add(50 * time.Second)
 			}
-			lastUATCheck = time.Now()
+			lastUATCheck = stratuxClock.Time
 		}
 
 		// When count is one, favor UAT in the case where the user
 		// has enabled both UAT and ES via the web interface.
 		id := 0
-		if globalSettings.UAT_Enabled && time.Now().After(stopCheckingUATUntil) {
+		if globalSettings.UAT_Enabled && stratuxClock.Time.After(stopCheckingUATUntil) {
 			// log.Println("globalSettings.UAT_Enabled == true")
 			if count == 1 {
 				if ESDev != nil {