// NewEchoChar ...
func NewEchoChar() *ble.Characteristic {
e := &echoChar{m: make(map[string]chan []byte)}
c := ble.NewCharacteristic(EchoCharUUID)
c.HandleWrite(ble.WriteHandlerFunc(e.written))
c.HandleNotify(ble.NotifyHandlerFunc(e.echo))
c.HandleIndicate(ble.NotifyHandlerFunc(e.echo))
return c
}
// NewCountChar ...
func NewCountChar() *ble.Characteristic {
n := 0
c := ble.NewCharacteristic(CountCharUUID)
c.HandleRead(ble.ReadHandlerFunc(func(req ble.Request, rsp ble.ResponseWriter) {
fmt.Fprintf(rsp, "count: Read %d", n)
log.Printf("count: Read %d", n)
n++
}))
c.HandleWrite(ble.WriteHandlerFunc(func(req ble.Request, rsp ble.ResponseWriter) {
log.Printf("count: Wrote %s", string(req.Data()))
}))
c.HandleNotify(ble.NotifyHandlerFunc(func(req ble.Request, n ble.Notifier) {
cnt := 0
log.Printf("count: Notification subscribed")
for {
select {
case <-n.Context().Done():
log.Printf("count: Notification unsubscribed")
return
case <-time.After(time.Second):
log.Printf("count: Notify: %d", cnt)
if _, err := fmt.Fprintf(n, "Count: %d", cnt); err != nil {
// Client disconnected prematurely before unsubscription.
log.Printf("count: Failed to notify : %s", err)
return
}
cnt++
}
}
}))
c.HandleIndicate(ble.NotifyHandlerFunc(func(req ble.Request, n ble.Notifier) {
cnt := 0
log.Printf("count: Indication subscribed")
for {
select {
case <-n.Context().Done():
log.Printf("count: Indication unsubscribed")
return
case <-time.After(time.Second):
log.Printf("count: Indicate: %d", cnt)
if _, err := fmt.Fprintf(n, "Count: %d", cnt); err != nil {
// Client disconnected prematurely before unsubscription.
log.Printf("count: Failed to indicate : %s", err)
return
}
cnt++
}
}
}))
return c
}
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}
}