func NewCountService() *gatt.Service {
n := 0
s := gatt.NewService(gatt.MustParseUUID("09fc95c0-c111-11e3-9904-0002a5d5c51b"))
s.AddCharacteristic(gatt.MustParseUUID("11fac9e0-c111-11e3-9246-0002a5d5c51b")).HandleReadFunc(
func(rsp gatt.ResponseWriter, req *gatt.ReadRequest) {
fmt.Fprintf(rsp, "count: %d", n)
n++
})
s.AddCharacteristic(gatt.MustParseUUID("16fe0d80-c111-11e3-b8c8-0002a5d5c51b")).HandleWriteFunc(
func(r gatt.Request, data []byte) (status byte) {
log.Println("Wrote:", string(data))
return gatt.StatusSuccess
})
s.AddCharacteristic(gatt.MustParseUUID("1c927b50-c116-11e3-8a33-0800200c9a66")).HandleNotifyFunc(
func(r gatt.Request, n gatt.Notifier) {
cnt := 0
for !n.Done() {
fmt.Fprintf(n, "Count: %d", cnt)
cnt++
time.Sleep(time.Second)
}
})
return s
}
// NOTE: OS X provides GAP and GATT services, and they can't be customized.
// For Linux/Embedded, however, this is something we want to fully control.
func NewGapService(name string) *gatt.Service {
s := gatt.NewService(attrGAPUUID)
s.AddCharacteristic(attrDeviceNameUUID).SetValue([]byte(name))
s.AddCharacteristic(attrAppearanceUUID).SetValue(gapCharAppearanceGenericComputer)
s.AddCharacteristic(attrPeripheralPrivacyUUID).SetValue([]byte{0x00})
s.AddCharacteristic(attrReconnectionAddrUUID).SetValue([]byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00})
s.AddCharacteristic(attrPeferredParamsUUID).SetValue([]byte{0x06, 0x00, 0x06, 0x00, 0x00, 0x00, 0xd0, 0x07})
return s
}
// NOTE: OS X provides GAP and GATT services, and they can't be customized.
// For Linux/Embedded, however, this is something we want to fully control.
func NewGattService() *gatt.Service {
s := gatt.NewService(attrGATTUUID)
s.AddCharacteristic(attrServiceChangedUUID).HandleNotifyFunc(
func(r gatt.Request, n gatt.Notifier) {
go func() {
log.Printf("TODO: indicate client when the services are changed")
}()
})
return s
}
func NewBatteryService() *gatt.Service {
lv := byte(100)
s := gatt.NewService(gatt.UUID16(0x180F))
c := s.AddCharacteristic(gatt.UUID16(0x2A19))
c.HandleReadFunc(
func(rsp gatt.ResponseWriter, req *gatt.ReadRequest) {
rsp.Write([]byte{lv})
lv--
})
// FIXME: this cause connection interrupted on Mac.
// Characteristic User Description
// c.AddDescriptor(gatt.UUID16(0x2901)).SetValue([]byte("Battery level between 0 and 100 percent"))
// Characteristic Presentation Format
c.AddDescriptor(gatt.UUID16(0x2904)).SetValue([]byte{4, 1, 39, 173, 1, 0, 0})
return s
}