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infinitime/infinitime.go

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package infinitime
import (
"bytes"
"encoding/binary"
"errors"
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"reflect"
"strings"
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"time"
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"github.com/fxamacker/cbor/v2"
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bt "github.com/muka/go-bluetooth/api"
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"github.com/muka/go-bluetooth/bluez"
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"github.com/muka/go-bluetooth/bluez/profile/adapter"
"github.com/muka/go-bluetooth/bluez/profile/device"
"github.com/muka/go-bluetooth/bluez/profile/gatt"
"go.arsenm.dev/infinitime/blefs"
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)
const BTName = "InfiniTime"
const (
NewAlertChar = "00002a46-0000-1000-8000-00805f9b34fb"
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NotifEventChar = "00020001-78fc-48fe-8e23-433b3a1942d0"
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StepCountChar = "00030001-78fc-48fe-8e23-433b3a1942d0"
MotionValChar = "00030002-78fc-48fe-8e23-433b3a1942d0"
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FirmwareVerChar = "00002a26-0000-1000-8000-00805f9b34fb"
CurrentTimeChar = "00002a2b-0000-1000-8000-00805f9b34fb"
BatteryLvlChar = "00002a19-0000-1000-8000-00805f9b34fb"
HeartRateChar = "00002a37-0000-1000-8000-00805f9b34fb"
FSTransferChar = "adaf0200-4669-6c65-5472-616e73666572"
FSVersionChar = "adaf0100-4669-6c65-5472-616e73666572"
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WeatherDataChar = "00040001-78fc-48fe-8e23-433b3a1942d0"
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)
type Device struct {
device *device.Device1
newAlertChar *gatt.GattCharacteristic1
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notifEventChar *gatt.GattCharacteristic1
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stepCountChar *gatt.GattCharacteristic1
motionValChar *gatt.GattCharacteristic1
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fwVersionChar *gatt.GattCharacteristic1
currentTimeChar *gatt.GattCharacteristic1
battLevelChar *gatt.GattCharacteristic1
heartRateChar *gatt.GattCharacteristic1
fsVersionChar *gatt.GattCharacteristic1
fsTransferChar *gatt.GattCharacteristic1
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weatherDataChar *gatt.GattCharacteristic1
notifEventCh chan uint8
notifEventDone bool
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Music MusicCtrl
DFU DFU
}
var (
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ErrNoDevices = errors.New("no InfiniTime devices found")
ErrNotFound = errors.New("could not find any advertising InfiniTime devices")
ErrNotConnected = errors.New("not connected")
ErrCharNotAvail = errors.New("required characteristic is not available")
ErrNoTimelineHeader = errors.New("events must contain the timeline header")
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ErrPairTimeout = errors.New("reached timeout while pairing")
)
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type Options struct {
AttemptReconnect bool
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WhitelistEnabled bool
Whitelist []string
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OnReqPasskey func() (uint32, error)
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OnReconnect func()
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}
var DefaultOptions = &Options{
AttemptReconnect: true,
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WhitelistEnabled: false,
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}
// Connect will attempt to connect to a
// paired InfiniTime device. If none are paired,
// it will attempt to discover and pair one.
//
// It will also attempt to reconnect to the device
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// if it disconnects and that is enabled in the options.
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func Connect(opts *Options) (*Device, error) {
if opts == nil {
opts = DefaultOptions
}
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// Set passkey request callback
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setOnPasskeyReq(opts.OnReqPasskey)
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// Connect to bluetooth device
btDev, err := connect(opts, true)
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if err != nil {
return nil, err
}
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// Create new device
out := &Device{device: btDev}
// Resolve characteristics
err = out.resolveChars()
if err != nil {
return nil, err
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}
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return out, nil
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}
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// connect connects to the InfiniTime bluez device
func connect(opts *Options, first bool) (dev *device.Device1, err error) {
// Get devices
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devs, err := defaultAdapter.GetDevices()
if err != nil {
return nil, err
}
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// For every device
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for _, listDev := range devs {
// If device name does not match, skip
if listDev.Properties.Name != BTName {
continue
}
// If whitelist enabled and doesn't contain
// device, skip
if opts.WhitelistEnabled &&
!contains(opts.Whitelist, listDev.Properties.Address) {
continue
}
// Set device
dev = listDev
break
}
// If device not set
if dev == nil {
// Discover devices on adapter
discoverCh, cancel, err := bt.Discover(defaultAdapter, &adapter.DiscoveryFilter{Transport: "le"})
if err != nil {
return nil, err
}
// For every discovery event
for event := range discoverCh {
// If event type is not device added, skip
if event.Type != adapter.DeviceAdded {
continue
}
// Create new device from event path
discovered, err := device.NewDevice1(event.Path)
if err != nil {
return nil, err
}
// If device name does not match, skip
if discovered.Properties.Name != BTName {
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continue
}
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// If whitelist enabled and doesn't contain
// device, skip
if opts.WhitelistEnabled &&
!contains(opts.Whitelist, discovered.Properties.Address) {
continue
}
// Set device
dev = discovered
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break
}
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// Stop discovery
cancel()
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}
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// If device is still not set, return error
if dev == nil {
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return nil, ErrNoDevices
}
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// Create variable to track if reconnect
// was required
reconnRequired := false
// If device is not connected
if !dev.Properties.Connected {
// Connect to device
err = dev.Connect()
if err != nil {
return nil, err
}
// Set reconnect required to true
reconnRequired = true
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}
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// If device is not paired
if !dev.Properties.Paired {
// Pair device
err = dev.Pair()
if err != nil {
return nil, err
}
}
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// If this is the first connection and reconnect
// is enabled, start reconnect goroutine
if first && opts.AttemptReconnect {
go reconnect(opts, dev)
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}
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// If this is not the first connection, a reonnect
// was required, and the OnReconnect callback exists,
// run it
if !first && reconnRequired && opts.OnReconnect != nil {
opts.OnReconnect()
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}
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return dev, nil
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}
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// reconnect reconnects to a device if it disconnects
func reconnect(opts *Options, dev *device.Device1) {
// Watch device properties
propCh := watchProps(dev)
// Create variables to store time of last disconnect
// and amount of diconnects
lastDisconnect := time.Unix(0, 0)
amtDisconnects := 0
for event := range propCh {
// If event name is not Connected and value is not false, skip
if event.Name != "Connected" && event.Value != false {
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continue
}
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// Store seconds since last disconnect
secsSince := time.Since(lastDisconnect).Seconds()
// If over 3 seconds have passed, reset disconnect count
if secsSince > 3 {
amtDisconnects = 0
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}
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// If less than 3 seconds have past and more than 6
// disconnects have occurred, remove the device and reset
if secsSince <= 3 && amtDisconnects >= 6 {
defaultAdapter.RemoveDevice(dev.Path())
lastDisconnect = time.Unix(0, 0)
amtDisconnects = 0
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}
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// Set disconnect variables
lastDisconnect = time.Now()
amtDisconnects++
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for i := 0; i < 6; i++ {
// If three tries failed, remove device
if i == 3 {
defaultAdapter.RemoveDevice(dev.Path())
}
// Connect to device
newDev, err := connect(opts, false)
if err != nil {
time.Sleep(time.Second)
continue
}
// Replace device with new device
*dev = *newDev
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break
}
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}
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}
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// bufferChannel writes all events on propCh to a new, buffered channel
func bufferChannel(propCh chan *bluez.PropertyChanged) <-chan *bluez.PropertyChanged {
out := make(chan *bluez.PropertyChanged, 10)
go func() {
for event := range propCh {
out <- event
}
}()
return out
}
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// watchProps returns a buffered channel for the device properties
func watchProps(dev *device.Device1) <-chan *bluez.PropertyChanged {
uPropCh, err := dev.WatchProperties()
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if err != nil {
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panic(err)
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}
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return bufferChannel(uPropCh)
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}
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// setOnPasskeyReq sets the callback for a passkey request.
// It ensures the function will never be nil.
func setOnPasskeyReq(onReqPasskey func() (uint32, error)) {
itdAgent.ReqPasskey = onReqPasskey
if itdAgent.ReqPasskey == nil {
itdAgent.ReqPasskey = func() (uint32, error) {
return 0, nil
}
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}
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}
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// contains checks if s is contained within ss
func contains(ss []string, s string) bool {
for _, str := range ss {
if strings.EqualFold(str, s) {
return true
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}
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}
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return false
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}
// resolveChars attempts to set all required
// characteristics in an InfiniTime struct
func (i *Device) resolveChars() error {
// Get device characteristics
chars, err := i.device.GetCharacteristics()
if err != nil {
return err
}
// While no characteristics found
for len(chars) == 0 {
// Sleep one second
time.Sleep(time.Second)
// Attempt to retry getting characteristics
chars, err = i.device.GetCharacteristics()
if err != nil {
return err
}
}
// For every discovered characteristics
for _, char := range chars {
// Set correct characteristics
switch char.Properties.UUID {
case NewAlertChar:
i.newAlertChar = char
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case NotifEventChar:
i.notifEventChar = char
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case StepCountChar:
i.stepCountChar = char
case MotionValChar:
i.motionValChar = char
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case FirmwareVerChar:
i.fwVersionChar = char
case CurrentTimeChar:
i.currentTimeChar = char
case BatteryLvlChar:
i.battLevelChar = char
case HeartRateChar:
i.heartRateChar = char
case MusicEventChar:
i.Music.eventChar = char
case MusicStatusChar:
i.Music.statusChar = char
case MusicArtistChar:
i.Music.artistChar = char
case MusicTrackChar:
i.Music.trackChar = char
case MusicAlbumChar:
i.Music.albumChar = char
case DFUCtrlPointChar:
i.DFU.ctrlPointChar = char
case DFUPacketChar:
i.DFU.packetChar = char
case FSTransferChar:
i.fsTransferChar = char
case FSVersionChar:
i.fsVersionChar = char
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case WeatherDataChar:
i.weatherDataChar = char
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}
}
return nil
}
// Address returns the InfiniTime's bluetooth address
func (i *Device) Address() string {
return i.device.Properties.Address
}
// Version returns InfiniTime's reported firmware version string
func (i *Device) Version() (string, error) {
if err := i.checkStatus(i.fwVersionChar); err != nil {
return "", err
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}
ver, err := i.fwVersionChar.ReadValue(nil)
return string(ver), err
}
// BatteryLevel gets the watch's battery level via the Battery Service
func (i *Device) BatteryLevel() (uint8, error) {
if err := i.checkStatus(i.battLevelChar); err != nil {
return 0, err
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}
battLevel, err := i.battLevelChar.ReadValue(nil)
if err != nil {
return 0, err
}
return uint8(battLevel[0]), nil
}
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func (i *Device) StepCount() (uint32, error) {
if err := i.checkStatus(i.stepCountChar); err != nil {
return 0, err
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}
stepCountData, err := i.stepCountChar.ReadValue(nil)
if err != nil {
return 0, err
}
return binary.LittleEndian.Uint32(stepCountData), nil
}
type MotionValues struct {
X int16
Y int16
Z int16
}
func (i *Device) Motion() (MotionValues, error) {
out := MotionValues{}
if err := i.checkStatus(i.motionValChar); err != nil {
return out, err
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}
motionVals, err := i.motionValChar.ReadValue(nil)
if err != nil {
return out, nil
}
motionValReader := bytes.NewReader(motionVals)
err = binary.Read(motionValReader, binary.LittleEndian, &out)
if err != nil {
return out, err
}
return out, nil
}
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func (i *Device) HeartRate() (uint8, error) {
if err := i.checkStatus(i.heartRateChar); err != nil {
return 0, err
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}
heartRate, err := i.heartRateChar.ReadValue(nil)
if err != nil {
return 0, err
}
return uint8(heartRate[1]), nil
}
func (i *Device) WatchHeartRate() (<-chan uint8, func(), error) {
if err := i.checkStatus(i.heartRateChar); err != nil {
return nil, nil, err
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}
// Start notifications on heart rate characteristic
err := i.heartRateChar.StartNotify()
if err != nil {
return nil, nil, err
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}
// Watch characteristics of heart rate characteristic
ch, err := i.heartRateChar.WatchProperties()
if err != nil {
return nil, nil, err
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}
out := make(chan uint8, 2)
currentHeartRate, err := i.HeartRate()
if err != nil {
return nil, nil, err
}
out <- currentHeartRate
cancel, done := cancelFunc()
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go func() {
// For every event
for event := range ch {
select {
case <-done:
close(out)
close(done)
i.heartRateChar.StopNotify()
return
default:
// If value changed
if event.Name == "Value" {
// Send heart rate to channel
out <- uint8(event.Value.([]byte)[1])
}
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}
}
}()
return out, cancel, nil
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}
func (i *Device) WatchBatteryLevel() (<-chan uint8, func(), error) {
if err := i.checkStatus(i.battLevelChar); err != nil {
return nil, nil, err
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}
// Start notifications on heart rate characteristic
err := i.battLevelChar.StartNotify()
if err != nil {
return nil, nil, err
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}
// Watch characteristics of heart rate characteristic
ch, err := i.battLevelChar.WatchProperties()
if err != nil {
return nil, nil, err
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}
out := make(chan uint8, 2)
currentBattLevel, err := i.BatteryLevel()
if err != nil {
return nil, nil, err
}
out <- currentBattLevel
cancel, done := cancelFunc()
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go func() {
// For every event
for event := range ch {
select {
case <-done:
close(out)
close(done)
i.battLevelChar.StopNotify()
return
default:
// If value changed
if event.Name == "Value" {
// Send heart rate to channel
out <- uint8(event.Value.([]byte)[0])
}
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}
}
}()
return out, cancel, nil
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}
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func (i *Device) WatchStepCount() (<-chan uint32, func(), error) {
if err := i.checkStatus(i.stepCountChar); err != nil {
return nil, nil, err
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}
// Start notifications on step count characteristic
err := i.stepCountChar.StartNotify()
if err != nil {
return nil, nil, err
}
// Watch properties of step count characteristic
ch, err := i.stepCountChar.WatchProperties()
if err != nil {
return nil, nil, err
}
out := make(chan uint32, 2)
currentStepCount, err := i.StepCount()
if err != nil {
return nil, nil, err
}
out <- currentStepCount
cancel, done := cancelFunc()
go func() {
// For every event
for event := range ch {
select {
case <-done:
close(out)
close(done)
i.stepCountChar.StopNotify()
return
default:
// If value changed
if event.Name == "Value" {
// Send step count to channel
out <- binary.LittleEndian.Uint32(event.Value.([]byte))
}
}
}
}()
return out, cancel, nil
}
func (i *Device) WatchMotion() (<-chan MotionValues, func(), error) {
if err := i.checkStatus(i.motionValChar); err != nil {
return nil, nil, err
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}
// Start notifications on motion characteristic
err := i.motionValChar.StartNotify()
if err != nil {
return nil, nil, err
}
// Watch properties of motion characteristic
ch, err := i.motionValChar.WatchProperties()
if err != nil {
return nil, nil, err
}
out := make(chan MotionValues, 2)
motionVals, err := i.Motion()
if err != nil {
return nil, nil, err
}
out <- motionVals
cancel, done := cancelFunc()
go func() {
// For every event
for event := range ch {
select {
case <-done:
close(out)
close(done)
i.motionValChar.StopNotify()
return
default:
// If value changed
if event.Name == "Value" {
// Read binary into MotionValues struct
binary.Read(bytes.NewReader(event.Value.([]byte)), binary.LittleEndian, &motionVals)
// Send step count to channel
out <- motionVals
}
}
}
}()
return out, cancel, nil
}
func cancelFunc() (func(), chan struct{}) {
done := make(chan struct{}, 1)
return func() {
done <- struct{}{}
}, done
}
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// SetTime sets the watch's time using the Current Time Service
func (i *Device) SetTime(t time.Time) error {
if err := i.checkStatus(i.currentTimeChar); err != nil {
return err
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}
buf := &bytes.Buffer{}
binary.Write(buf, binary.LittleEndian, uint16(t.Year()))
binary.Write(buf, binary.LittleEndian, uint8(t.Month()))
binary.Write(buf, binary.LittleEndian, uint8(t.Day()))
binary.Write(buf, binary.LittleEndian, uint8(t.Hour()))
binary.Write(buf, binary.LittleEndian, uint8(t.Minute()))
binary.Write(buf, binary.LittleEndian, uint8(t.Second()))
binary.Write(buf, binary.LittleEndian, uint8(t.Weekday()))
binary.Write(buf, binary.LittleEndian, uint8((t.Nanosecond()/1000)/1e6*256))
binary.Write(buf, binary.LittleEndian, uint8(0b0001))
return i.currentTimeChar.WriteValue(buf.Bytes(), nil)
}
// Notify sends a notification to InfiniTime via
// the Alert Notification Service (ANS)
func (i *Device) Notify(title, body string) error {
if err := i.checkStatus(i.newAlertChar); err != nil {
return err
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}
return i.newAlertChar.WriteValue(
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append([]byte{0x00, 0x01, 0x00}, []byte(title+"\x00"+body)...),
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nil,
)
}
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// These constants represent the possible call statuses selected by the user
const (
CallStatusDeclined uint8 = iota
CallStatusAccepted
CallStatusMuted
)
// NotifyCall sends a call notification to the PineTime and returns a channel.
// This channel will contain the user's response to the call notification.
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func (i *Device) NotifyCall(from string) (<-chan uint8, error) {
if err := i.checkStatus(i.newAlertChar); err != nil {
return nil, err
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}
// Write call notification to new alert characteristic
err := i.newAlertChar.WriteValue(
append([]byte{0x03, 0x01, 0x00}, []byte(from)...),
nil,
)
if err != nil {
return nil, err
}
if !i.notifEventDone {
err = i.initNotifEvent()
if err != nil {
return nil, err
}
i.notifEventDone = true
}
return i.notifEventCh, nil
}
// initNotifEvent initializes the notification event channel
func (i *Device) initNotifEvent() error {
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// Start notifications on notification event characteristic
err := i.notifEventChar.StartNotify()
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if err != nil {
return err
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}
// Watch properties of notification event characteristic
ch, err := i.notifEventChar.WatchProperties()
if err != nil {
return err
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}
// Create new output channel for status
i.notifEventCh = make(chan uint8, 1)
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go func() {
// For every event
for event := range ch {
// If value changed
if event.Name == "Value" {
// Send status to channel
i.notifEventCh <- uint8(event.Value.([]byte)[0])
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}
}
}()
return nil
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}
// FS creates and returns a new filesystem from the device
func (i *Device) FS() (*blefs.FS, error) {
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if err := i.checkStatus(i.fsTransferChar); err != nil {
return nil, err
}
return blefs.New(i.fsTransferChar)
}
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// AddWeatherEvent adds one of the event structs from
// the weather package to the timeline. Input must be
// a struct containing TimelineHeader.
func (i *Device) AddWeatherEvent(event interface{}) error {
if err := i.checkStatus(i.weatherDataChar); err != nil {
return err
}
// Get type of input
inputType := reflect.TypeOf(event)
// Check if input contains TimelineHeader
_, hdrExists := inputType.FieldByName("TimelineHeader")
// If header does not exist or input is not struct
if !hdrExists || inputType.Kind() != reflect.Struct {
return ErrNoTimelineHeader
}
// Encode event as CBOR
data, err := cbor.Marshal(event)
if err != nil {
return err
}
// Write data to weather data characteristic
return i.weatherDataChar.WriteValue(data, nil)
}
func (i *Device) checkStatus(char *gatt.GattCharacteristic1) error {
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connected, err := i.device.GetConnected()
if err != nil {
return err
}
if !connected {
return ErrNotConnected
}
if char == nil {
return ErrCharNotAvail
}
return nil
}