Add DiscoverServices() and interlocks to check central manager

ready state.

ble_darwin.go

@@ -20,7 +20,7 @@ type BLE struct {
 	peripherals Peripherals
 	hr          int
 
-	wantScan bool
+	ready, wantScan bool
 	sync.Mutex
 }
 
@@ -125,10 +125,9 @@ func (b *BLE) setState(x ns.CBManagerState) {
 	b.Lock()
 	defer b.Unlock()
 	b.state = x
-	if b.state == (ns.CBManagerState)(ns.CBManagerStatePoweredOn) && b.wantScan {
+	if b.ready && b.wantScan {
 		go func() {
 			fmt.Printf("Go: Scanning\n")
-			//cm.ScanForPeripheralsWithServices(ns.NSArrayWithObjects(hrm_uuid), nil)
 			cm.ScanForPeripheralsWithServices(nil, nil)
 		}()
 	}
@@ -147,19 +146,35 @@ func (b *BLE) Scan() {
 }
 
 func (b *BLE) StopScan() {
+	b.Lock()
+	if !b.ready {
+		b.Unlock()
+		return
+	}
+	b.Unlock()
 	fmt.Printf("Go: stopping scan\n")
 	cm.StopScan()
 }
 
 func (b *BLE) Connect(p Peripheral) {
-	go func() {
+	b.Lock()
+	if !b.ready {
+		b.Unlock()
+		return
+	}
+	b.Unlock()
 	cm.ConnectPeripheral(p.p, nil)
-	}()
+	fmt.Printf("cm.ConnectPeripheral() returned\n")
 }
 
 func updateState(c *ns.CBCentralManager) {
 	fmt.Printf("Go: did update state\n")
 	st := cm.CBManager.State()
+	if st == (ns.CBManagerState)(ns.CBManagerStatePoweredOn) {
+		ble.ready = true
+	} else {
+		ble.ready = false
+	}
 	ble.setState(st)
 	ble.events <- UpdateStateEvent{State: stringState(st)}
 }
@@ -195,12 +210,10 @@ func connectPeripheral(c *ns.CBCentralManager, p *ns.CBPeripheral) {
 
 	p.SetDelegate(cd)
 
-	// discover all services on this device
-
-	p.DiscoverServices(nil)
 	id := p.Identifier()
 	peripheral := Peripheral{p: p, identifier: id}
 	found := false
+
 	ble.peripherals.Lock()
 	for _, item := range ble.peripherals.items {
 		if item.p.identifier == id {
@@ -210,13 +223,26 @@ func connectPeripheral(c *ns.CBCentralManager, p *ns.CBPeripheral) {
 		}
 	}
 	ble.peripherals.Unlock()
+
 	if !found {
 		peripheral.Name = peripheralName(p)
+		ble.peripherals.Add(peripheral)
 	}
+
 	ble.events <- ConnectEvent{peripheral}
-	fmt.Printf("Go: discoverPeripheral returning\n")
+	fmt.Printf("Go: connectPeripheral returning\n")
 }
 
+func DiscoverServices(x Peripheral) {
+	fmt.Printf("Discovering services on %s\n", x.Name)
+	p := x.p
+
+	// discover all services on this device
+
+	p.DiscoverServices(nil)
+}
+
+
 func discoverServices(p *ns.CBPeripheral, e *ns.NSError) {
 	fmt.Printf("Did discover services\n")
 	p.Services().ObjectEnumerator().ForIn(func(o *ns.Id) bool {
@@ -278,7 +304,6 @@ func updateValue(p *ns.CBPeripheral, chr *ns.CBCharacteristic, e *ns.NSError) {
 		ble.Unlock()
 		fmt.Printf("Heart rate: %d\n", ble.hr)
 	}
-	fmt.Printf("Go: updateValue returning\n")
 }
 
 var (
@@ -287,7 +312,6 @@ var (
 	info_uuid  *ns.CBUUID
 	cd         *ns.CBDelegate
 	cm         *ns.CBCentralManager
-	//peripheral *ns.CBPeripheral
 )
 
 func NewBLE() *BLE {