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package service_example
import (
"errors"
"fmt"
"strings"
"time"
"github.com/godbus/dbus/v5"
"github.com/muka/go-bluetooth/api"
"github.com/muka/go-bluetooth/bluez/profile/adapter"
"github.com/muka/go-bluetooth/bluez/profile/agent"
"github.com/muka/go-bluetooth/bluez/profile/device"
log "github.com/sirupsen/logrus"
)
func client(adapterID, hwaddr string) (err error) {
log.Infof("Discovering %s on %s", hwaddr, adapterID)
a, err := adapter.NewAdapter1FromAdapterID(adapterID)
if err != nil {
return err
}
//Connect DBus System bus
conn, err := dbus.SystemBus()
if err != nil {
return err
}
// do not reuse agent0 from service
agent.NextAgentPath()
ag := agent.NewSimpleAgent()
err = agent.ExposeAgent(conn, ag, agent.CapNoInputNoOutput, true)
if err != nil {
return fmt.Errorf("SimpleAgent: %s", err)
}
dev, err := findDevice(a, hwaddr)
if err != nil {
return fmt.Errorf("findDevice: %s", err)
}
watchProps, err := dev.WatchProperties()
if err != nil {
return err
}
go func() {
for propUpdate := range watchProps {
log.Debugf("--> updated %s=%v", propUpdate.Name, propUpdate.Value)
}
}()
err = connect(dev, ag, adapterID)
if err != nil {
return err
}
retrieveServices(a, dev)
select {}
// return nil
}
func findDevice(a *adapter.Adapter1, hwaddr string) (*device.Device1, error) {
//
// devices, err := a.GetDevices()
// if err != nil {
// return nil, err
// }
//
// for _, dev := range devices {
// devProps, err := dev.GetProperties()
// if err != nil {
// log.Errorf("Failed to load dev props: %s", err)
// continue
// }
//
// log.Info(devProps.Address)
// if devProps.Address != hwaddr {
// continue
// }
//
// log.Infof("Found cached device Connected=%t Trusted=%t Paired=%t", devProps.Connected, devProps.Trusted, devProps.Paired)
// return dev, nil
// }
dev, err := discover(a, hwaddr)
if err != nil {
return nil, err
}
if dev == nil {
return nil, errors.New("Device not found, is it advertising?")
}
return dev, nil
}
func discover(a *adapter.Adapter1, hwaddr string) (*device.Device1, error) {
err := a.FlushDevices()
if err != nil {
return nil, err
}
discovery, cancel, err := api.Discover(a, nil)
if err != nil {
return nil, err
}
defer cancel()
for ev := range discovery {
dev, err := device.NewDevice1(ev.Path)
if err != nil {
return nil, err
}
if dev == nil || dev.Properties == nil {
continue
}
p := dev.Properties
n := p.Alias
if p.Name != "" {
n = p.Name
}
log.Debugf("Discovered (%s) %s", n, p.Address)
if p.Address != hwaddr {
continue
}
return dev, nil
}
return nil, nil
}
func connect(dev *device.Device1, ag *agent.SimpleAgent, adapterID string) error {
props, err := dev.GetProperties()
if err != nil {
return fmt.Errorf("Failed to load props: %s", err)
}
log.Infof("Found device name=%s addr=%s rssi=%d", props.Name, props.Address, props.RSSI)
if props.Connected {
log.Trace("Device is connected")
return nil
}
if !props.Paired || !props.Trusted {
log.Trace("Pairing device")
err := dev.Pair()
if err != nil {
return fmt.Errorf("Pair failed: %s", err)
}
log.Info("Pair succeed, connecting...")
agent.SetTrusted(adapterID, dev.Path())
}
if !props.Connected {
log.Trace("Connecting device")
err = dev.Connect()
if err != nil {
if !strings.Contains(err.Error(), "Connection refused") {
return fmt.Errorf("Connect failed: %s", err)
}
}
}
return nil
}
func retrieveServices(a *adapter.Adapter1, dev *device.Device1) error {
log.Debug("Listing exposed services")
list, err := dev.GetAllServicesAndUUID()
if err != nil {
return err
}
if len(list) == 0 {
time.Sleep(time.Second * 2)
return retrieveServices(a, dev)
}
for _, servicePath := range list {
log.Debugf("%s", servicePath)
}
return nil
}
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