Darwin: Expose MTRBaseDevice.sessionTransportType (#24065)

* Expose MTRBaseDevice.sessionTransportType.

- Use it in iOS CHIPTool
- Remove _deviceBeingCommissionedOverBLE

* Format / address comments

src/darwin/CHIPTool/CHIPTool/View Controllers/QRCode/QRCodeViewController.m

@@ -43,17 +43,6 @@
 
 #define NOT_APPLICABLE_STRING @"N/A"
 
-@interface MTRDeviceController (ToDoRemove)
-
-/**
- * TODO: Temporary until PairingDelegate is fixed to clearly communicate this
- * information to consumers.
- * This should be migrated over to the proper pairing delegate path
- */
-- (BOOL)_deviceBeingCommissionedOverBLE:(uint64_t)deviceId;
-
-@end
-
 @interface QRCodeViewController ()
 
 @property (nonatomic, strong) AVCaptureSession * captureSession;
@@ -497,8 +486,8 @@ - (void)onPairingComplete:(NSError * _Nullable)error
     } else {
         MTRDeviceController * controller = InitializeMTR();
         uint64_t deviceId = MTRGetLastPairedDeviceId();
-        if ([controller respondsToSelector:@selector(_deviceBeingCommissionedOverBLE:)] &&
-            [controller _deviceBeingCommissionedOverBLE:deviceId]) {
+        MTRBaseDevice * device = [controller deviceBeingCommissionedWithNodeID:@(deviceId) error:NULL];
+        if (device.sessionTransportType == MTRTransportTypeBLE) {
             dispatch_async(dispatch_get_main_queue(), ^{
                 [self->_deviceList refreshDeviceList];
                 [self retrieveAndSendWiFiCredentials];

src/darwin/Framework/CHIP/MTRBaseDevice.h

@@ -122,6 +122,13 @@ extern NSString * const MTRArrayValueType;
 @class MTRReadParams;
 @class MTRSubscribeParams;
 
+typedef NS_ENUM(uint8_t, MTRTransportType) {
+    MTRTransportTypeUndefined = 0,
+    MTRTransportTypeUDP,
+    MTRTransportTypeBLE,
+    MTRTransportTypeTCP,
+} MTR_NEWLY_AVAILABLE;
+
 @interface MTRBaseDevice : NSObject
 
 - (instancetype)init NS_UNAVAILABLE;
@@ -135,6 +142,12 @@ extern NSString * const MTRArrayValueType;
  */
 + (instancetype)deviceWithNodeID:(NSNumber *)nodeID controller:(MTRDeviceController *)controller MTR_NEWLY_AVAILABLE;
 
+/**
+ * The transport used by the current session with this device, or
+ * `MTRTransportTypeUndefined` if no session is currently active.
+ */
+@property (readonly) MTRTransportType sessionTransportType MTR_NEWLY_AVAILABLE;
+
 /**
  * Subscribe to receive attribute reports for everything (all endpoints, all
  * clusters, all attributes, all events) on the device.

src/darwin/Framework/CHIP/MTRBaseDevice.mm

@@ -268,6 +268,11 @@ + (instancetype)deviceWithNodeID:(NSNumber *)nodeID controller:(MTRDeviceControl
     return [controller baseDeviceForNodeID:nodeID];
 }
 
+- (MTRTransportType)sessionTransportType
+{
+    return [self.deviceController sessionTransportTypeForDevice:self];
+}
+
 - (void)invalidateCASESession
 {
     if (self.isPASEDevice) {

src/darwin/Framework/CHIP/MTRBaseDevice_Internal.h

@@ -27,6 +27,15 @@
 
 NS_ASSUME_NONNULL_BEGIN
 
+static inline MTRTransportType MTRMakeTransportType(chip::Transport::Type type)
+{
+    static_assert(MTRTransportTypeUndefined == (uint8_t) chip::Transport::Type::kUndefined, "MTRTransportType != Transport::Type");
+    static_assert(MTRTransportTypeUDP == (uint8_t) chip::Transport::Type::kUdp, "MTRTransportType != Transport::Type");
+    static_assert(MTRTransportTypeBLE == (uint8_t) chip::Transport::Type::kBle, "MTRTransportType != Transport::Type");
+    static_assert(MTRTransportTypeTCP == (uint8_t) chip::Transport::Type::kTcp, "MTRTransportType != Transport::Type");
+    return static_cast<MTRTransportType>(type);
+}
+
 @interface MTRBaseDevice ()
 
 - (instancetype)initWithPASEDevice:(chip::DeviceProxy *)device controller:(MTRDeviceController *)controller;
@@ -55,9 +64,6 @@ NS_ASSUME_NONNULL_BEGIN
  */
 @property (nonatomic, assign, readonly) chip::NodeId nodeID;
 
-- (instancetype)init NS_UNAVAILABLE;
-+ (instancetype)new NS_UNAVAILABLE;
-
 /**
  * Initialize the device object as a CASE device with the given node id and
  * controller.  This will always succeed, even if there is no such node id on

src/darwin/Framework/CHIP/MTRDeviceController.mm

@@ -14,9 +14,7 @@
  *    See the License for the specific language governing permissions and
  *    limitations under the License.
  */
-#import <os/lock.h>
-
-#import "MTRDeviceController.h"
+#import "MTRDeviceController_Internal.h"
 
 #import "MTRBaseDevice_Internal.h"
 #import "MTRCommissioningParameters.h"
@@ -54,6 +52,8 @@
 #include <setup_payload/ManualSetupPayloadGenerator.h>
 #include <system/SystemClock.h>
 
+#import <os/lock.h>
+
 static NSString * const kErrorCommissionerInit = @"Init failure while initializing a commissioner";
 static NSString * const kErrorIPKInit = @"Init failure while initializing IPK";
 static NSString * const kErrorSigningKeypairInit = @"Init failure while creating signing keypair bridge";
@@ -678,17 +678,6 @@ - (BOOL)checkIsRunning:(NSError * __autoreleasing *)error
     return NO;
 }
 
-- (BOOL)_deviceBeingCommissionedOverBLE:(uint64_t)deviceID
-{
-    VerifyOrReturnValue([self checkIsRunning], NO);
-
-    chip::CommissioneeDeviceProxy * deviceProxy;
-    auto errorCode = self->_cppCommissioner->GetDeviceBeingCommissioned(deviceID, &deviceProxy);
-    VerifyOrReturnValue(errorCode == CHIP_NO_ERROR, NO);
-
-    return deviceProxy->GetDeviceTransportType() == chip::Transport::Type::kBle;
-}
-
 - (void)getSessionForNode:(chip::NodeId)nodeID completion:(MTRInternalDeviceConnectionCallback)completion
 {
     [self
@@ -728,6 +717,28 @@ - (void)getSessionForCommissioneeDevice:(chip::NodeId)deviceID completion:(MTRIn
         }];
 }
 
+- (MTRTransportType)sessionTransportTypeForDevice:(MTRBaseDevice *)device
+{
+    VerifyOrReturnValue([self checkIsRunning], MTRTransportTypeUndefined);
+
+    __block MTRTransportType result = MTRTransportTypeUndefined;
+    dispatch_sync(_chipWorkQueue, ^{
+        VerifyOrReturn([self checkIsRunning]);
+
+        if (device.isPASEDevice) {
+            chip::CommissioneeDeviceProxy * deviceProxy;
+            VerifyOrReturn(CHIP_NO_ERROR == self->_cppCommissioner->GetDeviceBeingCommissioned(device.nodeID, &deviceProxy));
+            result = MTRMakeTransportType(deviceProxy->GetDeviceTransportType());
+        } else {
+            auto scopedNodeID = self->_cppCommissioner->GetPeerScopedId(device.nodeID);
+            auto sessionHandle = self->_cppCommissioner->SessionMgr()->FindSecureSessionForNode(scopedNodeID);
+            VerifyOrReturn(sessionHandle.HasValue());
+            result = MTRMakeTransportType(sessionHandle.Value()->AsSecureSession()->GetPeerAddress().GetTransportType());
+        }
+    });
+    return result;
+}
+
 - (void)asyncGetCommissionerOnMatterQueue:(void (^)(chip::Controller::DeviceCommissioner *))block
                              errorHandler:(nullable MTRDeviceErrorHandler)errorHandler
 {
@@ -795,10 +806,6 @@ - (BOOL)syncRunOnWorkQueueWithBoolReturnValue:(SyncWorkQueueBlockWithBoolReturnV
     return success;
 }
 
-@end
-
-@implementation MTRDeviceController (InternalMethods)
-
 - (chip::FabricIndex)fabricIndex
 {
     if (!_cppCommissioner) {
@@ -848,6 +855,7 @@ - (void)invalidateCASESessionForNode:(chip::NodeId)nodeID;
 
     [self syncRunOnWorkQueue:block error:nil];
 }
+
 @end
 
 /**

src/darwin/Framework/CHIP/MTRDeviceController_Internal.h

@@ -44,7 +44,7 @@ namespace Controller {
 
 NS_ASSUME_NONNULL_BEGIN
 
-@interface MTRDeviceController (InternalMethods)
+@interface MTRDeviceController ()
 
 #pragma mark - MTRDeviceControllerFactory methods
 
@@ -139,6 +139,12 @@ NS_ASSUME_NONNULL_BEGIN
  */
 - (void)getSessionForCommissioneeDevice:(chip::NodeId)deviceID completion:(MTRInternalDeviceConnectionCallback)completion;
 
+/**
+ * Returns the transport used by the current session with the given device,
+ * or `MTRTransportTypeUndefined` if no session is currently active.
+ */
+- (MTRTransportType)sessionTransportTypeForDevice:(MTRBaseDevice *)device;
+
 /**
  * Invalidate the CASE session for the given node ID.  This is a temporary thing
  * just to support MTRBaseDevice's invalidateCASESession.  Must not be called on