Check DS18B20 bulk read status before reading

pkg/temperature/ds18b20.go

@@ -78,18 +78,29 @@ func PollSensors(ctx context.Context, wg *sync.WaitGroup, readingInterval time.D
 	work_loop:
 		select {
 		case <-ticker.C:
-			start := time.Now()
+		poll_bus:
-
+			state, err := pollBusState()
-			if accErrTrigger > 60 {
+			if err != nil {
-				log.Fatal("Thermal bulk read failed 60 times in a row -- terminating")
+				accErrTrigger++
+				hub.CaptureException(err)
+				log.Print(err)
+				break
 			}
 
+			switch state {
+			case BulkReadBusy:
+				time.Sleep(busPollDelay)
+				goto poll_bus
+
+			case BulkReadIdle:
+				start := time.Now()
+
 				// Trigger a bulk read to start conversion on all sensors.
 				if err := triggerBulkRead(); err != nil {
 					accErrTrigger++
 					hub.CaptureException(err)
 					log.Print(err)
-				break
+					break work_loop
 				}
 
 				accErrTrigger = 0
@@ -101,25 +112,16 @@ func PollSensors(ctx context.Context, wg *sync.WaitGroup, readingInterval time.D
 					time.Sleep(deltaSleep)
 				}
 
-			// Poll bus state
-		poll_bus:
-			state, err := pollBusState()
-			if err != nil {
-				accErrTrigger++
-				hub.CaptureException(err)
-				log.Print(err)
-				break work_loop
-			}
-
-			switch state {
-			case BulkReadBusy:
-				time.Sleep(busPollDelay)
 				goto poll_bus
 
-			case BulkReadIdle, BulkReadReady:
+			case BulkReadReady:
 				readSensors(hub)
 			}
 
+			if accErrTrigger > 60 {
+				log.Fatal("Thermal bulk read failed 60 times in a row -- terminating")
+			}
+
 		case c := <-ConfigUpdate:
 			configure(c)