forked from go-ble/ble
/
device.go
569 lines (512 loc) · 13.3 KB
/
device.go
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package darwin
import (
"bytes"
"context"
"encoding/binary"
"fmt"
"log"
"time"
"github.com/GreenLightning/ble"
"github.com/pkg/errors"
"github.com/raff/goble/xpc"
"sync"
)
// Device is either a Peripheral or Central device.
type Device struct {
pm xpc.XPC // peripheralManager
cm xpc.XPC // centralManager
role int // 1: peripheralManager (server), 0: centralManager (client)
rspc chan msg
conns map[string]*conn
connLock sync.Mutex
// Only used in client/centralManager implementation
advHandler ble.AdvHandler
chConn chan *conn
// Only used in server/peripheralManager implementation
chars map[int]*ble.Characteristic
base int
}
// NewDevice returns a BLE device.
func NewDevice(opts ...ble.Option) (*Device, error) {
err := initXpcIDs()
if err != nil {
return nil, err
}
d := &Device{
rspc: make(chan msg),
conns: make(map[string]*conn),
chConn: make(chan *conn),
chars: make(map[int]*ble.Characteristic),
base: 1,
}
if err := d.Option(opts...); err != nil {
return nil, err
}
d.pm = xpc.XpcConnect(serviceID, d)
d.cm = xpc.XpcConnect(serviceID, d)
return d, errors.Wrap(d.Init(), "can't init")
}
// Option sets the options specified.
func (d *Device) Option(opts ...ble.Option) error {
var err error
for _, opt := range opts {
err = opt(d)
}
return err
}
// Init ...
func (d *Device) Init() error {
rsp, err := d.sendReq(d.cm, cmdInit, xpc.Dict{
"kCBMsgArgName": fmt.Sprintf("gopher-%v", time.Now().Unix()),
"kCBMsgArgOptions": xpc.Dict{
"kCBInitOptionShowPowerAlert": 1,
},
"kCBMsgArgType": 0,
})
if err != nil {
return err
}
s := State(rsp.state())
if s != StatePoweredOn {
return fmt.Errorf("state: %s", s)
}
rsp, err = d.sendReq(d.pm, cmdInit, xpc.Dict{
"kCBMsgArgName": fmt.Sprintf("gopher-%v", time.Now().Unix()),
"kCBMsgArgOptions": xpc.Dict{
"kCBInitOptionShowPowerAlert": 1,
},
"kCBMsgArgType": 1,
})
if err != nil {
return err
}
s = State(rsp.state())
if s != StatePoweredOn {
return fmt.Errorf("state: %s", s)
}
return nil
}
// Advertise advertises the given Advertisement
func (d *Device) Advertise(ctx context.Context, adv ble.Advertisement) error {
rsp, err := d.sendReq(d.pm, cmdAdvertiseStart, xpc.Dict{
"kCBAdvDataLocalName": adv.LocalName(),
"kCBAdvDataServiceUUIDs": adv.Services(),
"kCBAdvDataAppleMfgData": adv.ManufacturerData(),
})
if err != nil {
return err
}
if err := rsp.err(); err != nil {
return err
}
<-ctx.Done()
_ = d.stopAdvertising()
return ctx.Err()
}
// AdvertiseMfgData ...
func (d *Device) AdvertiseMfgData(ctx context.Context, id uint16, md []byte) error {
l := len(md)
b := []byte{byte(l + 3), 0xFF, uint8(id), uint8(id >> 8)}
rsp, err := d.sendReq(d.pm, cmdAdvertiseStart, xpc.Dict{
"kCBAdvDataAppleMfgData": append(b, md...),
})
if err != nil {
return err
}
if err := rsp.err(); err != nil {
return errors.Wrap(err, "can't advertise")
}
<-ctx.Done()
return ctx.Err()
}
// AdvertiseServiceData16 advertises data associated with a 16bit service uuid
func (d *Device) AdvertiseServiceData16(ctx context.Context, id uint16, b []byte) error {
l := len(b)
prefix := []byte{
0x03, 0x03, uint8(id), uint8(id >> 8),
byte(l + 3), 0x16, uint8(id), uint8(id >> 8),
}
rsp, err := d.sendReq(d.pm, cmdAdvertiseStart, xpc.Dict{
"kCBAdvDataAppleMfgData": append(prefix, b...),
})
if err != nil {
return err
}
if err := rsp.err(); err != nil {
return errors.Wrap(err, "can't advertise")
}
<-ctx.Done()
return ctx.Err()
}
// AdvertiseNameAndServices advertises name and specifid service UUIDs.
func (d *Device) AdvertiseNameAndServices(ctx context.Context, name string, ss ...ble.UUID) error {
rsp, err := d.sendReq(d.pm, cmdAdvertiseStart, xpc.Dict{
"kCBAdvDataLocalName": name,
"kCBAdvDataServiceUUIDs": uuidSlice(ss)},
)
if err != nil {
return err
}
if err := rsp.err(); err != nil {
return err
}
<-ctx.Done()
_ = d.stopAdvertising()
return ctx.Err()
}
// AdvertiseIBeaconData advertises iBeacon packet with specified manufacturer data.
func (d *Device) AdvertiseIBeaconData(ctx context.Context, md []byte) error {
var utsname xpc.Utsname
err := xpc.Uname(&utsname)
if err != nil {
return err
}
if utsname.Release >= "14." {
ibeaconCode := []byte{0x02, 0x15}
return d.AdvertiseMfgData(ctx, 0x004C, append(ibeaconCode, md...))
}
rsp, err := d.sendReq(d.pm, cmdAdvertiseStart, xpc.Dict{"kCBAdvDataAppleBeaconKey": md})
if err != nil {
return err
}
if err := rsp.err(); err != nil {
return err
}
<-ctx.Done()
return d.stopAdvertising()
}
// AdvertiseIBeacon advertises iBeacon packet.
func (d *Device) AdvertiseIBeacon(ctx context.Context, u ble.UUID, major, minor uint16, pwr int8) error {
b := make([]byte, 21)
copy(b, ble.Reverse(u)) // Big endian
binary.BigEndian.PutUint16(b[16:], major) // Big endian
binary.BigEndian.PutUint16(b[18:], minor) // Big endian
b[20] = uint8(pwr) // Measured Tx Power
return d.AdvertiseIBeaconData(ctx, b)
}
// stopAdvertising stops advertising.
func (d *Device) stopAdvertising() error {
rsp, err := d.sendReq(d.pm, cmdAdvertiseStop, nil)
if err != nil {
return errors.Wrap(err, "can't send stop advertising")
}
if err := rsp.err(); err != nil {
return errors.Wrap(err, "can't stop advertising")
}
return nil
}
// Scan ...
func (d *Device) Scan(ctx context.Context, allowDup bool, h ble.AdvHandler) error {
d.advHandler = h
if err := d.sendCmd(d.cm, cmdScanningStart, xpc.Dict{
// "kCBMsgArgUUIDs": uuidSlice(ss),
"kCBMsgArgOptions": xpc.Dict{
"kCBScanOptionAllowDuplicates": map[bool]int{true: 1, false: 0}[allowDup],
},
}); err != nil {
return err
}
<-ctx.Done()
if err := d.stopScanning(); err != nil {
return errors.Wrap(ctx.Err(), err.Error())
}
return ctx.Err()
}
// stopAdvertising stops advertising.
func (d *Device) stopScanning() error {
return errors.Wrap(d.sendCmd(d.cm, cmdScanningStop, nil), "can't stop scanning")
}
// RemoveAllServices removes all services of device's
func (d *Device) RemoveAllServices() error {
return d.sendCmd(d.pm, cmdServicesRemove, nil)
}
// AddService adds a service to device's database.
// The following services are ignored as they are provided by OS X.
//
// 0x1800 (Generic Access)
// 0x1801 (Generic Attribute)
// 0x1805 (Current Time Service)
// 0x180A (Device Information)
// 0x180F (Battery Service)
// 0x1812 (Human Interface Device)
func (d *Device) AddService(s *ble.Service) error {
if s.UUID.Equal(ble.GAPUUID) ||
s.UUID.Equal(ble.GATTUUID) ||
s.UUID.Equal(ble.CurrentTimeUUID) ||
s.UUID.Equal(ble.DeviceInfoUUID) ||
s.UUID.Equal(ble.BatteryUUID) ||
s.UUID.Equal(ble.HIDUUID) {
return nil
}
xs := xpc.Dict{
"kCBMsgArgAttributeID": d.base,
"kCBMsgArgAttributeIDs": []int{},
"kCBMsgArgCharacteristics": nil,
"kCBMsgArgType": 1, // 1 => primary, 0 => excluded
"kCBMsgArgUUID": ble.Reverse(s.UUID),
}
d.base++
xcs := xpc.Array{}
for _, c := range s.Characteristics {
props := 0
perm := 0
if c.Property&ble.CharRead != 0 {
props |= 0x02
if ble.CharRead&c.Secure != 0 {
perm |= 0x04
} else {
perm |= 0x01
}
}
if c.Property&ble.CharWriteNR != 0 {
props |= 0x04
if c.Secure&ble.CharWriteNR != 0 {
perm |= 0x08
} else {
perm |= 0x02
}
}
if c.Property&ble.CharWrite != 0 {
props |= 0x08
if c.Secure&ble.CharWrite != 0 {
perm |= 0x08
} else {
perm |= 0x02
}
}
if c.Property&ble.CharNotify != 0 {
if c.Secure&ble.CharNotify != 0 {
props |= 0x100
} else {
props |= 0x10
}
}
if c.Property&ble.CharIndicate != 0 {
if c.Secure&ble.CharIndicate != 0 {
props |= 0x200
} else {
props |= 0x20
}
}
xc := xpc.Dict{
"kCBMsgArgAttributeID": d.base,
"kCBMsgArgUUID": ble.Reverse(c.UUID),
"kCBMsgArgAttributePermissions": perm,
"kCBMsgArgCharacteristicProperties": props,
"kCBMsgArgData": c.Value,
}
c.Handle = uint16(d.base)
d.chars[d.base] = c
d.base++
xds := xpc.Array{}
for _, d := range c.Descriptors {
if d.UUID.Equal(ble.ClientCharacteristicConfigUUID) {
// skip CCCD
continue
}
xd := xpc.Dict{
"kCBMsgArgData": d.Value,
"kCBMsgArgUUID": ble.Reverse(d.UUID),
}
xds = append(xds, xd)
}
xc["kCBMsgArgDescriptors"] = xds
xcs = append(xcs, xc)
}
xs["kCBMsgArgCharacteristics"] = xcs
rsp, err := d.sendReq(d.pm, cmdServicesAdd, xs)
if err != nil {
return err
}
return rsp.err()
}
// SetServices ...
func (d *Device) SetServices(ss []*ble.Service) error {
if err := d.RemoveAllServices(); err != nil {
return nil
}
for _, s := range ss {
if err := d.AddService(s); err != nil {
return err
}
}
return nil
}
// Dial ...
func (d *Device) Dial(ctx context.Context, a ble.Addr) (ble.Client, error) {
err := d.sendCmd(d.cm, cmdConnect, xpc.Dict{
"kCBMsgArgDeviceUUID": xpc.MakeUUID(a.String()),
"kCBMsgArgOptions": xpc.Dict{
"kCBConnectOptionNotifyOnDisconnection": 1,
},
})
if err != nil {
return nil, err
}
select {
case <-ctx.Done():
return nil, ctx.Err()
case c := <-d.chConn:
c.SetContext(ctx)
return NewClient(c)
}
}
// Stop ...
func (d *Device) Stop() error {
return nil
}
// HandleXpcEvent process Device events and asynchronous errors.
func (d *Device) HandleXpcEvent(event xpc.Dict, err error) {
if err != nil {
log.Println("error:", err)
return
}
m := msg(event)
args := msg(msg(event).args())
logger.Info("recv", "id", m.id(), "args", fmt.Sprintf("%v", m.args()))
switch m.id() {
case // Device event
evtStateChanged,
evtAdvertisingStarted,
evtAdvertisingStopped,
evtServiceAdded:
d.rspc <- args
case evtPeripheralDiscovered:
if d.advHandler == nil {
break
}
a := &adv{args: m.args(), ad: args.advertisementData()}
go d.advHandler(a)
case evtConfirmation:
// log.Printf("confirmed: %d", args.attributeID())
case evtATTMTU:
d.conn(args).SetTxMTU(args.attMTU())
case evtSlaveConnectionComplete:
// remote peripheral is connected.
fallthrough
case evtMasterConnectionComplete:
// remote central is connected.
// Could be LEConnectionComplete or LEConnectionUpdateComplete.
c := d.conn(args)
c.connInterval = args.connectionInterval()
c.connLatency = args.connectionLatency()
c.supervisionTimeout = args.supervisionTimeout()
case evtReadRequest:
aid := args.attributeID()
char := d.chars[aid]
v := char.Value
if v == nil {
c := d.conn(args)
req := ble.NewRequest(c, nil, args.offset())
buf := bytes.NewBuffer(make([]byte, 0, c.txMTU-1))
rsp := ble.NewResponseWriter(buf)
char.ReadHandler.ServeRead(req, rsp)
v = buf.Bytes()
}
err := d.sendCmd(d.pm, cmdSendData, xpc.Dict{
"kCBMsgArgAttributeID": aid,
"kCBMsgArgData": v,
"kCBMsgArgTransactionID": args.transactionID(),
"kCBMsgArgResult": 0,
})
if err != nil {
log.Printf("error: %v", err)
return
}
case evtWriteRequest:
for _, xxw := range args.attWrites() {
xw := msg(xxw.(xpc.Dict))
aid := xw.attributeID()
char := d.chars[aid]
req := ble.NewRequest(d.conn(args), xw.data(), xw.offset())
char.WriteHandler.ServeWrite(req, nil)
if xw.ignoreResponse() == 1 {
continue
}
err := d.sendCmd(d.pm, cmdSendData, xpc.Dict{
"kCBMsgArgAttributeID": aid,
"kCBMsgArgData": nil,
"kCBMsgArgTransactionID": args.transactionID(),
"kCBMsgArgResult": 0,
})
if err != nil {
log.Println("error:", err)
return
}
}
case evtSubscribe:
// characteristic is subscribed by remote central.
d.conn(args).subscribed(d.chars[args.attributeID()])
case evtUnsubscribe:
// characteristic is unsubscribed by remote central.
d.conn(args).unsubscribed(d.chars[args.attributeID()])
case evtPeripheralConnected:
c := d.conn(args)
if !c.isConnected {
c.isConnected = true
d.chConn <- c
}
case evtPeripheralDisconnected:
c := d.conn(args)
c.isConnected = false
select {
case c.rspc <- m:
// Canceled by local central synchronously
default:
// Canceled by remote peripheral asynchronously.
}
d.connLock.Lock()
delete(d.conns, c.RemoteAddr().String())
d.connLock.Unlock()
close(c.done)
case evtCharacteristicRead:
// Notification
c := d.conn(args)
sub := c.subs[uint16(args.characteristicHandle())]
if sub == nil {
log.Printf("notified by unsubscribed handle")
// FIXME: should terminate the connection?
} else {
sub.fn(args.data())
}
break
case // Peripheral events
evtRSSIRead,
evtServiceDiscovered,
evtIncludedServicesDiscovered,
evtCharacteristicsDiscovered,
evtCharacteristicWritten,
evtNotificationValueSet,
evtDescriptorsDiscovered,
evtDescriptorRead,
evtDescriptorWritten:
d.conn(args).rspc <- m
default:
log.Printf("Unhandled event: %#v", event)
}
}
func (d *Device) conn(m msg) *conn {
// Convert xpc.UUID to ble.UUID.
a := ble.MustParse(m.deviceUUID().String())
d.connLock.Lock()
c, ok := d.conns[a.String()]
if !ok {
c = newConn(d, a, m.attMTU())
d.conns[a.String()] = c
}
d.connLock.Unlock()
return c
}
// sendReq sends a message and waits for its reply.
func (d *Device) sendReq(x xpc.XPC, id int, args xpc.Dict) (msg, error) {
err := d.sendCmd(x, id, args)
if err != nil {
return msg{}, err
}
return <-d.rspc, nil
}
func (d *Device) sendCmd(x xpc.XPC, id int, args xpc.Dict) error {
logger.Info("send", "id", id, "args", fmt.Sprintf("%v", args))
x.Send(xpc.Dict{"kCBMsgId": id, "kCBMsgArgs": args}, false)
return nil
}