- fix PinPull optional configuration

internal/PinControlService/Pin.go

@@ -9,7 +9,7 @@ type Pin struct {
 	Id                int
 	Name              string
 	Direction         PinDirection
-	PullConfig        PinPull
+	PullConfig        *PinPull
 	InitialState      *PinCommand
 	PinHandle         HardwarePinInterface
 	SendPollingEvents bool
@@ -85,14 +85,16 @@ func (p *Pin) Configure() {
 
 	p.PinHandle.Detect(AnyEdge)
 
-	if p.PullConfig == PullUp {
-		p.PinHandle.PullUp()
-	} else if p.PullConfig == PullDown {
-		p.PinHandle.PullDown()
-	} else if p.PullConfig == PullOff {
-		p.PinHandle.PullOff()
-	} else {
-		log.Errorf("unknown config value \"%s\" for pull-config", p.PullConfig)
+	if p.PullConfig != nil {
+		if *p.PullConfig == PullUp {
+			p.PinHandle.PullUp()
+		} else if *p.PullConfig == PullDown {
+			p.PinHandle.PullDown()
+		} else if *p.PullConfig == PullOff {
+			p.PinHandle.PullOff()
+		} else {
+			log.Errorf("unknown config value \"%s\" for pull-config", *p.PullConfig)
+		}
 	}
 
 }