Handle unknown device types

For devices that we have no idea how to handle, i.e. no services or
expose entries were processed, we return ErrUnknownDeviceType and skip
it during AddDevicesFromJSON(). This prevents a device from showing up
where HomeKit says it's not supported.

bridge.go

@@ -393,7 +393,7 @@ func (br *Bridge) AddDevicesFromJSON(devJson []byte) error {
 
 		acc, exp, err := createAccessory(&dev)
 		if err != nil {
-			if err == ErrDeviceSkipped {
+			if err == ErrDeviceSkipped || err == ErrUnknownDeviceType {
 				continue
 			}
 			return err

z2m.go

@@ -25,6 +25,7 @@ var IgnoreProperties = map[string]bool{
 var (
 	ErrDeviceSkipped     = fmt.Errorf("device is skipped")
 	ErrMalfomedDevice    = fmt.Errorf("device is malformed")
+	ErrUnknownDeviceType = fmt.Errorf("device type is unknown")
 
 	ErrNotNumericCharacteristic = fmt.Errorf("characteristic is non-numeric")
 )
@@ -119,6 +120,11 @@ func createAccessory(dev *Device) (*accessory.A, []*ExposeMapping, error) {
 		allExposes = append(allExposes, exposes...)
 	}
 
+	// if no Exposes entry was processed, return error
+	if len(allExposes) == 0 {
+		return nil, nil, ErrUnknownDeviceType
+	}
+
 	// copy value ranges
 	for _, e := range allExposes {
 		if e.ExposesEntry.Type != "numeric" {
@@ -316,6 +322,7 @@ func (m *ExposeMapping) ToExposedValue(v any) (any, error) {
 			expVal = m.ExposesEntry.ValueOn
 		}
 	}
+
 	return expVal, err
 }