func cmdRead(c *cli.Context) error {
if err := doGetUUID(c); err != nil {
return err
}
if err := doConnect(c); err != nil {
return err
}
if err := doDiscover(c); err != nil {
return err
}
if u := curr.profile.Find(ble.NewCharacteristic(curr.uuid)); u != nil {
b, err := curr.client.ReadCharacteristic(u.(*ble.Characteristic))
if err != nil {
return errors.Wrap(err, "can't read characteristic")
}
fmt.Printf(" Value %x | %q\n", b, b)
return nil
}
if u := curr.profile.Find(ble.NewDescriptor(curr.uuid)); u != nil {
b, err := curr.client.ReadDescriptor(u.(*ble.Descriptor))
if err != nil {
return errors.Wrap(err, "can't read descriptor")
}
fmt.Printf(" Value %x | %q\n", b, b)
return nil
}
return errNoUUID
}
func newCCCD(c *ble.Characteristic) *ble.Descriptor {
d := ble.NewDescriptor(ble.ClientCharacteristicConfigUUID)
d.HandleRead(ble.ReadHandlerFunc(func(req ble.Request, rsp ble.ResponseWriter) {
cccs := req.Conn().(*conn).cccs
ccc := cccs[c.Handle]
binary.Write(rsp, binary.LittleEndian, ccc)
}))
d.HandleWrite(ble.WriteHandlerFunc(func(req ble.Request, rsp ble.ResponseWriter) {
cn := req.Conn().(*conn)
old := cn.cccs[c.Handle]
ccc := binary.LittleEndian.Uint16(req.Data())
oldNotify := old&cccNotify != 0
oldIndicate := old&cccIndicate != 0
newNotify := ccc&cccNotify != 0
newIndicate := ccc&cccIndicate != 0
if newNotify && !oldNotify {
if c.Property&ble.CharNotify == 0 {
rsp.SetStatus(ble.ErrUnlikely)
return
}
send := func(b []byte) (int, error) { return cn.svr.notify(c.ValueHandle, b) }
cn.nn[c.Handle] = ble.NewNotifier(send)
go c.NotifyHandler.ServeNotify(req, cn.nn[c.Handle])
}
if !newNotify && oldNotify {
cn.nn[c.Handle].Close()
}
if newIndicate && !oldIndicate {
if c.Property&ble.CharIndicate == 0 {
rsp.SetStatus(ble.ErrUnlikely)
return
}
send := func(b []byte) (int, error) { return cn.svr.indicate(c.ValueHandle, b) }
cn.in[c.Handle] = ble.NewNotifier(send)
go c.IndicateHandler.ServeNotify(req, cn.in[c.Handle])
}
if !newIndicate && oldIndicate {
cn.in[c.Handle].Close()
}
cn.cccs[c.Handle] = ccc
}))
return d
}
func cmdWrite(c *cli.Context) error {
if err := doGetUUID(c); err != nil {
return err
}
if err := doConnect(c); err != nil {
return err
}
if err := doDiscover(c); err != nil {
return err
}
if u := curr.profile.Find(ble.NewCharacteristic(curr.uuid)); u != nil {
err := curr.client.WriteCharacteristic(u.(*ble.Characteristic), []byte("hello"), true)
return errors.Wrap(err, "can't write characteristic")
}
if u := curr.profile.Find(ble.NewDescriptor(curr.uuid)); u != nil {
err := curr.client.WriteDescriptor(u.(*ble.Descriptor), []byte("fixme"))
return errors.Wrap(err, "can't write descriptor")
}
return errNoUUID
}
