nswrap/examples/bluetooth/main.go

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package main
import "C"
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import (
"encoding/binary"
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"fmt"
"git.wow.st/gmp/nswrap/examples/bluetooth/ns"
"runtime"
"time"
)
func updateState(self ns.CBDelegate, c *ns.CBCentralManager) {
fmt.Printf("Go: did update state\n")
switch ns.NSInteger(cm.CBManager.State()) {
case ns.CBManagerStateUnknown:
fmt.Printf(" unknown\n")
case ns.CBManagerStateResetting:
fmt.Printf(" resetting\n")
case ns.CBManagerStateUnsupported:
fmt.Printf(" unsupported\n")
case ns.CBManagerStateUnauthorized:
fmt.Printf(" unauthorized\n")
case ns.CBManagerStatePoweredOff:
fmt.Printf(" powered off\n")
case ns.CBManagerStatePoweredOn:
fmt.Printf(" powered on\n")
cm.ScanForPeripheralsWithServices(ns.NSArrayWithObjects(hrm_uuid), nil)
}
fmt.Printf("Go: updateState returning\n")
}
func discoverPeripheral(self ns.CBDelegate, c *ns.CBCentralManager, p *ns.CBPeripheral, d *ns.NSDictionary, rssi *ns.NSNumber) {
fmt.Printf("Did discover peripheral\n")
c.StopScan()
// if we already have a pointer to a peripheral, check that this one is different,
// and if so release the old one. Be careful to check the Objective-C pointers
// here as the Go pointers will differ.
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if peripheral != nil && p.Ptr() != peripheral.Ptr() {
peripheral.Release()
}
peripheral = p
// we need to take ownership of this peripheral so CoreBluetooth doesn't
// dealloc it.
peripheral.Retain()
c.ConnectPeripheral(peripheral, nil)
}
func connectPeripheral(self ns.CBDelegate, c *ns.CBCentralManager, p *ns.CBPeripheral) {
fmt.Printf("Did connect peripheral\n")
// set ourselves up as a peripheral delegate
p.SetDelegate(cd)
// discover all services on this device
p.DiscoverServices(nil)
fmt.Printf("Go: discoverPeripheral returning\n")
}
func discoverServices(self ns.CBDelegate, p *ns.CBPeripheral, e *ns.NSError) {
fmt.Printf("Did discover services\n")
p.Services().ObjectEnumerator().ForIn(func(o *ns.Id) bool {
serv := o.CBService()
uuid := serv.UUID()
switch {
case uuid.IsEqualTo(hrm_uuid):
fmt.Printf("--heart rate monitor service\n")
p.DiscoverCharacteristics(nil, serv)
case uuid.IsEqualTo(info_uuid):
fmt.Printf("--device information service\n")
p.DiscoverCharacteristics(nil, serv)
default:
fmt.Printf("--unknown service\n")
}
return true
})
fmt.Printf("Go: discoverServices returning\n")
}
func hr(d *ns.NSData) int {
if l := int(d.Length()); l < 4 {
return 0
}
x := C.GoBytes(d.Bytes(), 4)
flags := x[0]
if flags&0x80 != 0 { // uint16 format
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return int(binary.BigEndian.Uint16(x[1:2]))
} else {
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return int(x[1])
}
}
func discoverCharacteristics(self ns.CBDelegate, p *ns.CBPeripheral, s *ns.CBService, e *ns.NSError) {
fmt.Printf("Did discover characteristics\n")
uuid := s.UUID()
fmt.Printf("----%s\n", uuid.UUIDString())
if uuid.IsEqualTo(hrm_uuid) {
s.Characteristics().ObjectEnumerator().ForIn(func(o *ns.Id) bool {
chr := o.CBCharacteristic()
chuuid := chr.UUID()
fmt.Printf("------%s\n", chuuid.UUIDString())
if chuuid.IsEqualTo(hrv_uuid) {
p.SetNotifyValue((ns.BOOL)(true), chr)
v := chr.Value()
fmt.Println(hr(v))
}
return true
})
}
fmt.Printf("Go: discoverCharacteristics returning\n")
}
func updateValue(self ns.CBDelegate, p *ns.CBPeripheral, chr *ns.CBCharacteristic, e *ns.NSError) {
if chr.UUID().IsEqualTo(hrv_uuid) {
v := chr.Value()
fmt.Printf("Heart rate: %d\n", hr(v))
}
fmt.Printf("Go: updateValue returning\n")
}
var (
hrm_uuid *ns.CBUUID
hrv_uuid *ns.CBUUID
info_uuid *ns.CBUUID
cd *ns.CBDelegate
cm *ns.CBCentralManager
peripheral *ns.CBPeripheral
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)
func main() {
queue := ns.DispatchQueueCreate(ns.CharWithGoString("my_new_queue"), nil)
cd = ns.CBDelegateAlloc()
cd.CentralManagerDidUpdateStateCallback(updateState)
cd.CentralManagerDidDiscoverPeripheralCallback(discoverPeripheral)
cd.CentralManagerDidConnectPeripheralCallback(connectPeripheral)
cd.PeripheralDidDiscoverServicesCallback(discoverServices)
cd.PeripheralDidDiscoverCharacteristicsForServiceCallback(discoverCharacteristics)
cd.PeripheralDidUpdateValueForCharacteristicCallback(updateValue)
hrm_uuid = ns.CBUUIDWithGoString("180D")
hrv_uuid = ns.CBUUIDWithGoString("2A37")
info_uuid = ns.CBUUIDWithGoString("180A")
// We defined our own queue because this won't work on the main queue.
cm = ns.CBCentralManagerAlloc().InitWithDelegateQueue(cd, queue)
// For debugging purposes, run GC every second to make sure things are not
// over-released.
go func() {
for {
runtime.GC()
time.Sleep(time.Second)
}
}()
select {}
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}