예제 #1
0
파일: client.go 프로젝트: currantlabs/ble
// DiscoverCharacteristics finds all the characteristics within a service. [Vol 3, Part G, 4.6.1]
// If filter is specified, only filtered characteristics are returned.
func (cln *Client) DiscoverCharacteristics(cs []ble.UUID, s *ble.Service) ([]*ble.Characteristic, error) {
	rsp := cln.conn.sendReq(62, xpc.Dict{
		"kCBMsgArgDeviceUUID":         cln.id,
		"kCBMsgArgServiceStartHandle": s.Handle,
		"kCBMsgArgServiceEndHandle":   s.EndHandle,
		"kCBMsgArgUUIDs":              uuidSlice(cs),
	})
	if rsp.err() != nil {
		return nil, rsp.err()
	}
	for _, xcs := range rsp.characteristics() {
		xc := msg(xcs.(xpc.Dict))
		s.Characteristics = append(s.Characteristics, &ble.Characteristic{
			UUID:        ble.MustParse(xc.uuid()),
			Property:    ble.Property(xc.characteristicProperties()),
			Handle:      uint16(xc.characteristicHandle()),
			ValueHandle: uint16(xc.characteristicValueHandle()),
		})
	}
	return s.Characteristics, nil
}
예제 #2
0
파일: client.go 프로젝트: currantlabs/ble
// DiscoverCharacteristics finds all the characteristics within a service. [Vol 3, Part G, 4.6.1]
// If filter is specified, only filtered characteristics are returned.
func (p *Client) DiscoverCharacteristics(filter []ble.UUID, s *ble.Service) ([]*ble.Characteristic, error) {
	p.Lock()
	defer p.Unlock()
	start := s.Handle
	var lastChar *ble.Characteristic
	for start <= s.EndHandle {
		length, b, err := p.ac.ReadByType(start, s.EndHandle, ble.CharacteristicUUID)
		if err == ble.ErrAttrNotFound {
			break
		} else if err != nil {
			return nil, err
		}
		for len(b) != 0 {
			h := binary.LittleEndian.Uint16(b[:2])
			p := ble.Property(b[2])
			vh := binary.LittleEndian.Uint16(b[3:5])
			u := ble.UUID(b[5:length])
			c := &ble.Characteristic{
				UUID:        u,
				Property:    p,
				Handle:      h,
				ValueHandle: vh,
				EndHandle:   s.EndHandle,
			}
			if filter == nil || ble.Contains(filter, u) {
				s.Characteristics = append(s.Characteristics, c)
			}
			if lastChar != nil {
				lastChar.EndHandle = c.Handle - 1
			}
			lastChar = c
			start = vh + 1
			b = b[length:]
		}
	}
	return s.Characteristics, nil
}