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gap_hci.go
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gap_hci.go
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//go:build hci || ninafw || cyw43439
package bluetooth
import (
"encoding/binary"
"errors"
"slices"
"time"
)
const defaultMTU = 23
var (
ErrConnect = errors.New("bluetooth: could not connect")
)
// Scan starts a BLE scan.
func (a *Adapter) Scan(callback func(*Adapter, ScanResult)) error {
if a.scanning {
return errScanning
}
if err := a.hci.leSetScanEnable(false, true); err != nil {
return err
}
// passive scanning, every 40ms, for 30ms
if err := a.hci.leSetScanParameters(0x00, 0x0080, 0x0030, 0x00, 0x00); err != nil {
return err
}
a.scanning = true
// scan with duplicates
if err := a.hci.leSetScanEnable(true, false); err != nil {
return err
}
lastUpdate := time.Now().UnixNano()
for {
if err := a.hci.poll(); err != nil {
return err
}
switch {
case a.hci.advData.reported:
adf := AdvertisementFields{}
if a.hci.advData.eirLength > 31 {
if debug {
println("eirLength too long")
}
a.hci.clearAdvData()
continue
}
for i := 0; i < int(a.hci.advData.eirLength); {
l, t := int(a.hci.advData.eirData[i]), a.hci.advData.eirData[i+1]
if l < 1 {
break
}
switch t {
case 0x02, 0x03:
// 16-bit Service Class UUID
adf.ServiceUUIDs = append(adf.ServiceUUIDs, New16BitUUID(binary.LittleEndian.Uint16(a.hci.advData.eirData[i+2:i+4])))
case 0x06, 0x07:
// 128-bit Service Class UUID
var uuid [16]byte
copy(uuid[:], a.hci.advData.eirData[i+2:i+18])
adf.ServiceUUIDs = append(adf.ServiceUUIDs, NewUUID(uuid))
case 0x08, 0x09:
if debug {
println("local name", string(a.hci.advData.eirData[i+2:i+1+l]))
}
adf.LocalName = string(a.hci.advData.eirData[i+2 : i+1+l])
case 0xFF:
// Manufacturer Specific Data
}
i += l + 1
}
random := a.hci.advData.peerBdaddrType == 0x01
callback(a, ScanResult{
Address: Address{
MACAddress{
MAC: makeAddress(a.hci.advData.peerBdaddr),
isRandom: random,
},
},
RSSI: int16(a.hci.advData.rssi),
AdvertisementPayload: &advertisementFields{
AdvertisementFields: adf,
},
})
a.hci.clearAdvData()
time.Sleep(5 * time.Millisecond)
default:
if !a.scanning {
return nil
}
if debug && (time.Now().UnixNano()-lastUpdate)/int64(time.Second) > 1 {
println("still scanning...")
lastUpdate = time.Now().UnixNano()
}
time.Sleep(5 * time.Millisecond)
}
}
return nil
}
func (a *Adapter) StopScan() error {
if !a.scanning {
return errNotScanning
}
if err := a.hci.leSetScanEnable(false, false); err != nil {
return err
}
a.scanning = false
return nil
}
// Address contains a Bluetooth MAC address.
type Address struct {
MACAddress
}
// Connect starts a connection attempt to the given peripheral device address.
func (a *Adapter) Connect(address Address, params ConnectionParams) (Device, error) {
if debug {
println("Connect")
}
random := uint8(0)
if address.isRandom {
random = 1
}
if err := a.hci.leCreateConn(0x0060, 0x0030, 0x00,
random, makeNINAAddress(address.MAC),
0x00, 0x0006, 0x000c, 0x0000, 0x00c8, 0x0004, 0x0006); err != nil {
return Device{}, err
}
// are we connected?
start := time.Now().UnixNano()
for {
if err := a.hci.poll(); err != nil {
return Device{}, err
}
if a.hci.connectData.connected {
defer a.hci.clearConnectData()
random := false
if address.isRandom {
random = true
}
d := Device{
Address: Address{
MACAddress{
MAC: makeAddress(a.hci.connectData.peerBdaddr),
isRandom: random},
},
deviceInternal: &deviceInternal{
adapter: a,
handle: a.hci.connectData.handle,
mtu: defaultMTU,
notificationRegistrations: make([]notificationRegistration, 0),
},
}
a.addConnection(d)
return d, nil
} else {
// check for timeout
if (time.Now().UnixNano()-start)/int64(time.Second) > 5 {
break
}
time.Sleep(5 * time.Millisecond)
}
}
// cancel connection attempt that failed
if err := a.hci.leCancelConn(); err != nil {
return Device{}, err
}
return Device{}, ErrConnect
}
type notificationRegistration struct {
handle uint16
callback func([]byte)
}
// Device is a connection to a remote peripheral.
type Device struct {
Address Address
*deviceInternal
}
type deviceInternal struct {
adapter *Adapter
handle uint16
mtu uint16
notificationRegistrations []notificationRegistration
}
// Disconnect from the BLE device.
func (d Device) Disconnect() error {
if debug {
println("Disconnect")
}
if err := d.adapter.hci.disconnect(d.handle); err != nil {
return err
}
d.adapter.removeConnection(d)
return nil
}
// RequestConnectionParams requests a different connection latency and timeout
// of the given device connection. Fields that are unset will be left alone.
// Whether or not the device will actually honor this, depends on the device and
// on the specific parameters.
//
// On NINA, this call hasn't been implemented yet.
func (d Device) RequestConnectionParams(params ConnectionParams) error {
return nil
}
func (d Device) findNotificationRegistration(handle uint16) *notificationRegistration {
for _, n := range d.notificationRegistrations {
if n.handle == handle {
return &n
}
}
return nil
}
func (d Device) addNotificationRegistration(handle uint16, callback func([]byte)) {
d.notificationRegistrations = append(d.notificationRegistrations,
notificationRegistration{
handle: handle,
callback: callback,
})
}
func (d Device) startNotifications() {
d.adapter.startNotifications()
}
var defaultAdvertisement Advertisement
// Advertisement encapsulates a single advertisement instance.
type Advertisement struct {
adapter *Adapter
localName []byte
serviceUUIDs []UUID
interval uint16
}
// DefaultAdvertisement returns the default advertisement instance but does not
// configure it.
func (a *Adapter) DefaultAdvertisement() *Advertisement {
if defaultAdvertisement.adapter == nil {
defaultAdvertisement.adapter = a
}
return &defaultAdvertisement
}
// Configure this advertisement.
func (a *Advertisement) Configure(options AdvertisementOptions) error {
switch {
case options.LocalName != "":
a.localName = []byte(options.LocalName)
default:
a.localName = []byte("TinyGo")
}
a.serviceUUIDs = append([]UUID{}, options.ServiceUUIDs...)
a.interval = uint16(options.Interval)
a.adapter.AddService(
&Service{
UUID: ServiceUUIDGenericAccess,
Characteristics: []CharacteristicConfig{
{
UUID: CharacteristicUUIDDeviceName,
Flags: CharacteristicReadPermission,
Value: a.localName,
},
{
UUID: CharacteristicUUIDAppearance,
Flags: CharacteristicReadPermission,
},
},
})
a.adapter.AddService(
&Service{
UUID: ServiceUUIDGenericAttribute,
Characteristics: []CharacteristicConfig{
{
UUID: CharacteristicUUIDServiceChanged,
Flags: CharacteristicIndicatePermission,
},
},
})
return nil
}
// Start advertisement. May only be called after it has been configured.
func (a *Advertisement) Start() error {
// uint8_t type = (_connectable) ? 0x00 : (_localName ? 0x02 : 0x03);
typ := uint8(0x00)
if err := a.adapter.hci.leSetAdvertisingParameters(a.interval, a.interval,
typ, 0x00, 0x00, [6]byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, 0x07, 0); err != nil {
return err
}
var advertisingData [31]byte
advertisingDataLen := uint8(0)
advertisingData[0] = 0x02
advertisingData[1] = 0x01
advertisingData[2] = 0x06
advertisingDataLen += 3
// TODO: handle multiple service UUIDs
if len(a.serviceUUIDs) > 0 {
uuid := a.serviceUUIDs[0]
var sz uint8
switch {
case uuid.Is16Bit():
sz = 2
binary.LittleEndian.PutUint16(advertisingData[5:], uuid.Get16Bit())
case uuid.Is32Bit():
sz = 6
data := uuid.Bytes()
slices.Reverse(data[:])
copy(advertisingData[5:], data[:])
}
advertisingData[3] = sz + 1
advertisingData[4] = sz
advertisingDataLen += sz + 2
}
// TODO: handle manufacturer data
if err := a.adapter.hci.leSetAdvertisingData(advertisingData[:advertisingDataLen]); err != nil {
return err
}
var scanResponseData [31]byte
scanResponseDataLen := uint8(0)
switch {
case len(a.localName) > 29:
scanResponseData[1] = 0x08
scanResponseData[0] = 1 + 29
copy(scanResponseData[2:], a.localName[:29])
scanResponseDataLen = 31
case len(a.localName) > 0:
scanResponseData[1] = 0x09
scanResponseData[0] = uint8(1 + len(a.localName))
copy(scanResponseData[2:], a.localName)
scanResponseDataLen = uint8(2 + len(a.localName))
}
if err := a.adapter.hci.leSetScanResponseData(scanResponseData[:scanResponseDataLen]); err != nil {
return err
}
if err := a.adapter.hci.leSetAdvertiseEnable(true); err != nil {
return err
}
// go routine to poll for HCI events while advertising
go func() {
for {
if err := a.adapter.att.poll(); err != nil {
// TODO: handle error
if debug {
println("error polling while advertising:", err.Error())
}
}
time.Sleep(5 * time.Millisecond)
}
}()
return nil
}
// Stop advertisement. May only be called after it has been started.
func (a *Advertisement) Stop() error {
return a.adapter.hci.leSetAdvertiseEnable(false)
}