[APP-7651]: Implement methods for start/stop advertising a BLE connection.

subsystems/provisioning/bluetooth/bluetooth_wifi_provisioner.go

@@ -46,7 +46,7 @@
 	currentValue T
 }
 
 // bluetoothWiFiProvisioner provides an interface for managing BLE (bluetooth-low-energy) peripheral advertisement on Linux.
 type BluetoothWiFiProvisioner struct {
 	logger logging.Logger
 	mu     sync.Mutex
@@ -77,7 +77,7 @@
 	return bwp.stopAdvertisingBLE()
 }
 
 // Update updates the list of networks that are advertised via bluetooth as available.
 func (bwp *BluetoothWiFiProvisioner) RefreshAvailableNetworks(ctx context.Context, awns *AvailableWiFiNetworks) error {
 	return bwp.writeAvailableNetworks(ctx, awns)
 }
@@ -128,12 +128,40 @@
 
 /** Unexported helper methods for low-level system calls and read/write requests to/from bluetooth characteristics **/
 
 func (bwp *BluetoothWiFiProvisioner) startAdvertisingBLE(ctx context.Context) error {
-	return errors.New("TODO APP-7644: Add Linux-specific bluetooth calls for automatic pairing and read/write to BLE characteristics")
+	bwp.mu.Lock()
+	defer bwp.mu.Unlock()
+
+	if bwp.adv == nil {
+		return errors.New("advertisement is nil")
+	}
+	if bwp.advActive {
+		return errors.New("invalid request, advertising already active")
+	}
+	if err := bwp.adv.Start(); err != nil {
+		return errw.WithMessage(err, "failed to start advertising")
+	}
+	bwp.advActive = true
+	bwp.logger.Info("started advertising a BLE connection...")
+	return nil
 }
 
 func (bwp *BluetoothWiFiProvisioner) stopAdvertisingBLE() error {
-	return errors.New("TODO APP-7644: Add Linux-specific bluetooth calls for automatic pairing and read/write to BLE characteristics")
+	bwp.mu.Lock()
+	defer bwp.mu.Unlock()
+
+	if bwp.adv == nil {
+		return errors.New("advertisement is nil")
+	}
+	if !bwp.advActive {
+		return errors.New("invalid request, advertising already inactive")
+	}
+	if err := bwp.adv.Stop(); err != nil {
+		return errw.WithMessage(err, "failed to stop advertising")
+	}
+	bwp.advActive = false
+	bwp.logger.Info("stopped advertising a BLE connection")
+	return nil
 }
 
 func (bwp *BluetoothWiFiProvisioner) enableAutoAcceptPairRequest() {}