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scan.go
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scan.go
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/*
* Copyright (c) Clinton Freeman 2016
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
* associated documentation files (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge, publish, distribute,
* sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or
* substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
* NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package main
import (
"fmt"
"log"
"os"
"strings"
"github.com/cfreeman/gatt"
"github.com/cfreeman/gatt/examples/option"
)
// onStateChanged is called when the bluetooth device changes state.
func onStateChanged(d gatt.Device, s gatt.State) {
switch s {
case gatt.StatePoweredOn:
log.Println()
log.Printf("INFO:SCANNING")
log.Println()
d.Scan([]gatt.UUID{}, false)
return
default:
d.StopScanning()
}
}
func main() {
f, err := os.OpenFile("WeatherMachine2-scan.log", os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
if err != nil {
return // Ah-oh. Unable to log to file.
}
defer f.Close()
log.SetOutput(f)
d, err := gatt.NewDevice(option.DefaultClientOptions...)
if err != nil {
log.Printf("ERROR: Unable to get bluetooth device.")
return
}
done := make(chan bool)
// Register handlers.
d.Handle(
gatt.PeripheralDiscovered(func(p gatt.Peripheral, a *gatt.Advertisement, rssi int) {
if !strings.Contains(strings.ToUpper(a.LocalName), strings.ToUpper("polar")) {
log.Printf("INFO: FOUND %s\n", a.LocalName)
return // This is not a heart rate monitor.
}
// Stop scanning once we've found the heart rate monitor.
p.Device().StopScanning()
log.Printf("INFO: FOUND %s %s\n", a.LocalName, p.ID())
fmt.Printf("%s\n", p.ID())
close(done)
}),
)
d.Init(onStateChanged)
<-done
}