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
}
package service
import (
"log"
"github.com/plumlife/gatt"
)
var (
attrGATTUUID = gatt.UUID16(0x1801)
attrServiceChangedUUID = gatt.UUID16(0x2A05)
)
// 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
}
package service
import "github.com/plumlife/gatt"
var (
attrGAPUUID = gatt.UUID16(0x1800)
attrDeviceNameUUID = gatt.UUID16(0x2A00)
attrAppearanceUUID = gatt.UUID16(0x2A01)
attrPeripheralPrivacyUUID = gatt.UUID16(0x2A02)
attrReconnectionAddrUUID = gatt.UUID16(0x2A03)
attrPeferredParamsUUID = gatt.UUID16(0x2A04)
)
// https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.gap.appearance.xml
var gapCharAppearanceGenericComputer = []byte{0x00, 0x80}
// 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
}