ninafw: this PR contains several fixes and improvements for the NINAFW implementation including:

- correctly return from read requests instead of returning spurious error
- move some steps previously being done during Configure() into Start() where they more
correctly belonged.
- use advertising display name as the correct default value for the generic access characteristic.
- speed up the polling for new notifications for Centrals

Signed-off-by: deadprogram <ron@hybridgroup.com>

adapter_ninafw.go

@@ -171,7 +171,7 @@ func (a *Adapter) startNotifications() {
 				}
 			}
 
-			time.Sleep(250 * time.Millisecond)
+			time.Sleep(10 * time.Millisecond)
 		}
 	}()
 

att_ninafw.go

@@ -925,6 +925,8 @@ func (a *att) handleReadReq(handle, attrHandle uint16) error {
 			if err := a.hci.sendAclPkt(handle, attCID, response[:pos]); err != nil {
 				return err
 			}
+
+			return nil
 		}
 
 	case attributeTypeDescriptor:
@@ -945,6 +947,8 @@ func (a *att) handleReadReq(handle, attrHandle uint16) error {
 			if err := a.hci.sendAclPkt(handle, attCID, response[:pos]); err != nil {
 				return err
 			}
+
+			return nil
 		}
 	}
 

gap_ninafw.go

@@ -269,6 +269,10 @@ var defaultAdvertisement Advertisement
 // Advertisement encapsulates a single advertisement instance.
 type Advertisement struct {
 	adapter *Adapter
+
+	localName    []byte
+	serviceUUIDs []UUID
+	interval     uint16
 }
 
 // DefaultAdvertisement returns the default advertisement instance but does not
@@ -276,14 +280,31 @@ type Advertisement struct {
 func (a *Adapter) DefaultAdvertisement() *Advertisement {
 	if defaultAdvertisement.adapter == nil {
 		defaultAdvertisement.adapter = a
+	}
 
-		a.AddService(
+	return &defaultAdvertisement
+}
+
+// Configure this advertisement.
+func (a *Advertisement) Configure(options AdvertisementOptions) error {
+	switch {
+	case options.LocalName != "":
+		a.localName = []byte(options.LocalName)
+	default:
+		a.localName = []byte("TinyGo")
+	}
+
+	a.serviceUUIDs = append([]UUID{}, options.ServiceUUIDs...)
+	a.interval = uint16(options.Interval)
+
+	a.adapter.AddService(
 		&Service{
 			UUID: ServiceUUIDGenericAccess,
 			Characteristics: []CharacteristicConfig{
 				{
 					UUID:  CharacteristicUUIDDeviceName,
 					Flags: CharacteristicReadPermission,
+					Value: a.localName,
 				},
 				{
 					UUID:  CharacteristicUUIDAppearance,
@@ -291,7 +312,7 @@ func (a *Adapter) DefaultAdvertisement() *Advertisement {
 				},
 			},
 		})
-		a.AddService(
+	a.adapter.AddService(
 		&Service{
 			UUID: ServiceUUIDGenericAttribute,
 			Characteristics: []CharacteristicConfig{
@@ -301,17 +322,16 @@ func (a *Adapter) DefaultAdvertisement() *Advertisement {
 				},
 			},
 		})
-	}
 
-	return &defaultAdvertisement
+	return nil
 }
 
-// Configure this advertisement.
-func (a *Advertisement) Configure(options AdvertisementOptions) error {
+// Start advertisement. May only be called after it has been configured.
+func (a *Advertisement) Start() error {
 	// uint8_t type = (_connectable) ? 0x00 : (_localName ? 0x02 : 0x03);
 	typ := uint8(0x00)
 
-	if err := a.adapter.hci.leSetAdvertisingParameters(uint16(options.Interval), uint16(options.Interval),
+	if err := a.adapter.hci.leSetAdvertisingParameters(a.interval, a.interval,
 		typ, 0x00, 0x00, [6]byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, 0x07, 0); err != nil {
 		return err
 	}
@@ -325,8 +345,8 @@ func (a *Advertisement) Configure(options AdvertisementOptions) error {
 	advertisingDataLen += 3
 
 	// TODO: handle multiple service UUIDs
-	if len(options.ServiceUUIDs) > 0 {
-		uuid := options.ServiceUUIDs[0]
+	if len(a.serviceUUIDs) > 0 {
+		uuid := a.serviceUUIDs[0]
 		var sz uint8
 
 		switch {
@@ -355,23 +375,22 @@ func (a *Advertisement) Configure(options AdvertisementOptions) error {
 	scanResponseDataLen := uint8(0)
 
 	switch {
-	case len(options.LocalName) > 29:
+	case len(a.localName) > 29:
 		scanResponseData[1] = 0x08
 		scanResponseData[0] = 1 + 29
-		copy(scanResponseData[2:], options.LocalName[:29])
+		copy(scanResponseData[2:], a.localName[:29])
 		scanResponseDataLen = 31
-	case len(options.LocalName) > 0:
+	case len(a.localName) > 0:
 		scanResponseData[1] = 0x09
-		scanResponseData[0] = uint8(1 + len(options.LocalName))
-		copy(scanResponseData[2:], options.LocalName)
-		scanResponseDataLen = uint8(2 + len(options.LocalName))
+		scanResponseData[0] = uint8(1 + len(a.localName))
+		copy(scanResponseData[2:], a.localName)
+		scanResponseDataLen = uint8(2 + len(a.localName))
 	}
 
-	return a.adapter.hci.leSetScanResponseData(scanResponseData[:scanResponseDataLen])
-}
+	if err := a.adapter.hci.leSetScanResponseData(scanResponseData[:scanResponseDataLen]); err != nil {
+		return err
+	}
 
-// Start advertisement. May only be called after it has been configured.
-func (a *Advertisement) Start() error {
 	if err := a.adapter.hci.leSetAdvertiseEnable(true); err != nil {
 		return err
 	}

gatts_ninafw.go

@@ -42,10 +42,14 @@ func (a *Adapter) AddService(service *Service) error {
 			endHandle = a.att.addLocalAttribute(attributeTypeDescriptor, charHandle, shortUUID(gattClientCharacteristicConfigUUID).UUID(), CharacteristicReadPermission|CharacteristicWritePermission, []byte{0, 0})
 		}
 
-		if service.Characteristics[i].Handle != nil {
+		if service.Characteristics[i].Handle == nil {
+			service.Characteristics[i].Handle = &Characteristic{}
+		}
+
 		service.Characteristics[i].Handle.adapter = a
 		service.Characteristics[i].Handle.handle = valueHandle
 		service.Characteristics[i].Handle.permissions = service.Characteristics[i].Flags
+		if len(service.Characteristics[i].Value) > 0 {
 			service.Characteristics[i].Handle.value = service.Characteristics[i].Value
 		}