package main import "C" import ( "encoding/binary" "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. 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 return int(binary.BigEndian.Uint16(x[1:2])) } else { 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 ) 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 {} }