func (d *Device) conn(m msg) *conn {
// Convert xpc.UUID to ble.UUID.
a := ble.MustParse(m.deviceUUID().String())
c, ok := d.conns[a.String()]
if !ok {
c = newConn(d, a)
d.conns[a.String()] = c
}
return c
}
// DiscoverDescriptors finds all the descriptors within a characteristic. [Vol 3, Part G, 4.7.1]
// If filter is specified, only filtered descriptors are returned.
func (cln *Client) DiscoverDescriptors(ds []ble.UUID, c *ble.Characteristic) ([]*ble.Descriptor, error) {
rsp := cln.conn.sendReq(70, xpc.Dict{
"kCBMsgArgDeviceUUID": cln.id,
"kCBMsgArgCharacteristicHandle": c.Handle,
"kCBMsgArgCharacteristicValueHandle": c.ValueHandle,
"kCBMsgArgUUIDs": uuidSlice(ds),
})
for _, xds := range rsp.descriptors() {
xd := msg(xds.(xpc.Dict))
c.Descriptors = append(c.Descriptors, &ble.Descriptor{
UUID: ble.MustParse(xd.uuid()),
Handle: uint16(xd.descriptorHandle()),
})
}
return c.Descriptors, nil
}
// 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
}
// DiscoverServices finds all the primary services on a server. [Vol 3, Part G, 4.4.1]
// If filter is specified, only filtered services are returned.
func (cln *Client) DiscoverServices(ss []ble.UUID) ([]*ble.Service, error) {
rsp := cln.conn.sendReq(45, xpc.Dict{
"kCBMsgArgDeviceUUID": cln.id,
"kCBMsgArgUUIDs": uuidSlice(ss),
})
if rsp.err() != nil {
return nil, rsp.err()
}
svcs := []*ble.Service{}
for _, xss := range rsp.services() {
xs := msg(xss.(xpc.Dict))
svcs = append(svcs, &ble.Service{
UUID: ble.MustParse(xs.uuid()),
Handle: uint16(xs.serviceStartHandle()),
EndHandle: uint16(xs.serviceEndHandle()),
})
}
if cln.profile == nil {
cln.profile = &ble.Profile{Services: svcs}
}
return svcs, nil
}
func explore(cln ble.Client, p *ble.Profile) error {
for _, s := range p.Services {
fmt.Printf(" Service: %s %s, Handle (0x%02X)\n", s.UUID, ble.Name(s.UUID), s.Handle)
for _, c := range s.Characteristics {
fmt.Printf(" Characteristic: %s %s, Property: 0x%02X (%s), Handle(0x%02X), VHandle(0x%02X)\n",
c.UUID, ble.Name(c.UUID), c.Property, propString(c.Property), c.Handle, c.ValueHandle)
if (c.Property & ble.CharRead) != 0 {
b, err := cln.ReadCharacteristic(c)
if err != nil {
fmt.Printf("Failed to read characteristic: %s\n", err)
continue
}
fmt.Printf(" Value %x | %q\n", b, b)
}
for _, d := range c.Descriptors {
fmt.Printf(" Descriptor: %s %s, Handle(0x%02x)\n", d.UUID, ble.Name(d.UUID), d.Handle)
b, err := cln.ReadDescriptor(d)
if err != nil {
fmt.Printf("Failed to read descriptor: %s\n", err)
continue
}
fmt.Printf(" Value %x | %q\n", b, b)
}
if *sub != 0 {
// Don't bother to subscribe the Service Changed characteristics.
if c.UUID.Equal(ble.ServiceChangedUUID) {
continue
}
// Don't touch the Apple-specific Service/Characteristic.
// Service: D0611E78BBB44591A5F8487910AE4366
// Characteristic: 8667556C9A374C9184ED54EE27D90049, Property: 0x18 (WN),
// Descriptor: 2902, Client Characteristic Configuration
// Value 0000 | "\x00\x00"
if c.UUID.Equal(ble.MustParse("8667556C9A374C9184ED54EE27D90049")) {
continue
}
if (c.Property & ble.CharNotify) != 0 {
fmt.Printf("\n-- Subscribe to notification for %s --\n", *sub)
h := func(req []byte) { fmt.Printf("Notified: %q [ % X ]\n", string(req), req) }
if err := cln.Subscribe(c, false, h); err != nil {
log.Fatalf("subscribe failed: %s", err)
}
time.Sleep(*sub)
if err := cln.Unsubscribe(c, false); err != nil {
log.Fatalf("unsubscribe failed: %s", err)
}
fmt.Printf("-- Unsubscribe to notification --\n")
}
if (c.Property & ble.CharIndicate) != 0 {
fmt.Printf("\n-- Subscribe to indication of %s --\n", *sub)
h := func(req []byte) { fmt.Printf("Indicated: %q [ % X ]\n", string(req), req) }
if err := cln.Subscribe(c, true, h); err != nil {
log.Fatalf("subscribe failed: %s", err)
}
time.Sleep(*sub)
if err := cln.Unsubscribe(c, true); err != nil {
log.Fatalf("unsubscribe failed: %s", err)
}
fmt.Printf("-- Unsubscribe to indication --\n")
}
}
}
fmt.Printf("\n")
}
return nil
}
package lib
import "github.com/currantlabs/ble"
// Private 128-bit UUIDs, which avoids the base of pre-defined 16/32-bits UUIDS
// xxxxxxxx-0000-1000-8000-00805F9B34FB [Vol 3, Part B, 2.5.1].
var (
TestSvcUUID = ble.MustParse("00010000-0001-1000-8000-00805F9B34FB")
CountCharUUID = ble.MustParse("00010000-0002-1000-8000-00805F9B34FB")
EchoCharUUID = ble.MustParse("00020000-0002-1000-8000-00805F9B34FB")
)
