func defaultServices(name string) []*ble.Service {
// https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.ble.appearance.xml
var gapCharAppearanceGenericComputer = []byte{0x00, 0x80}
gapSvc := ble.NewService(ble.GAPUUID)
gapSvc.NewCharacteristic(ble.DeviceNameUUID).SetValue([]byte(name))
gapSvc.NewCharacteristic(ble.AppearanceUUID).SetValue(gapCharAppearanceGenericComputer)
gapSvc.NewCharacteristic(ble.PeripheralPrivacyUUID).SetValue([]byte{0x00})
gapSvc.NewCharacteristic(ble.ReconnectionAddrUUID).SetValue([]byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00})
gapSvc.NewCharacteristic(ble.PeferredParamsUUID).SetValue([]byte{0x06, 0x00, 0x06, 0x00, 0x00, 0x00, 0xd0, 0x07})
gattSvc := ble.NewService(ble.GATTUUID)
gattSvc.NewCharacteristic(ble.ServiceChangedUUID).HandleIndicate(
ble.NotifyHandlerFunc(func(r ble.Request, n ble.Notifier) {
log.Printf("TODO: indicate client when the services are changed")
for {
select {
case <-n.Context().Done():
log.Printf("count: Notification unsubscribed")
return
}
}
}))
return []*ble.Service{gapSvc, gattSvc}
}
func cmdServe(c *cli.Context) error {
testSvc := ble.NewService(lib.TestSvcUUID)
testSvc.AddCharacteristic(lib.NewCountChar())
testSvc.AddCharacteristic(lib.NewEchoChar())
if err := ble.AddService(testSvc); err != nil {
return errors.Wrap(err, "can't add service")
}
fmt.Printf("Serving GATT Server for %s...\n", c.Duration("tmo"))
ctx := ble.WithSigHandler(context.WithTimeout(context.Background(), c.Duration("tmo")))
return chkErr(ble.AdvertiseNameAndServices(ctx, "Gopher", testSvc.UUID))
}
// NewBatteryService ...
func NewBatteryService() *ble.Service {
lv := byte(100)
s := ble.NewService(ble.UUID16(0x180F))
c := s.NewCharacteristic(ble.UUID16(0x2A19))
c.HandleRead(
ble.ReadHandlerFunc(func(req ble.Request, rsp ble.ResponseWriter) {
rsp.Write([]byte{lv})
lv--
}))
// Characteristic User Description
c.NewDescriptor(ble.UUID16(0x2901)).SetValue([]byte("Battery level between 0 and 100 percent"))
// Characteristic Presentation Format
c.NewDescriptor(ble.UUID16(0x2904)).SetValue([]byte{4, 1, 39, 173, 1, 0, 0})
return s
}
func main() {
flag.Parse()
d, err := dev.NewDevice(*device)
if err != nil {
log.Fatalf("can't new device : %s", err)
}
ble.SetDefaultDevice(d)
testSvc := ble.NewService(lib.TestSvcUUID)
testSvc.AddCharacteristic(lib.NewCountChar())
testSvc.AddCharacteristic(lib.NewEchoChar())
if err := ble.AddService(testSvc); err != nil {
log.Fatalf("can't add service: %s", err)
}
// Advertise for specified durantion, or until interrupted by user.
fmt.Printf("Advertising for %s...\n", *du)
ctx := ble.WithSigHandler(context.WithTimeout(context.Background(), *du))
chkErr(ble.AdvertiseNameAndServices(ctx, "Gopher", testSvc.UUID))
}