Add better logging to downloadLogOfType in Matter.framework.

src/darwin/Framework/CHIP/MTRDevice_Concrete.mm

@@ -3759,11 +3759,19 @@ - (void)downloadLogOfType:(MTRDiagnosticLogType)type
                     queue:(dispatch_queue_t)queue
                completion:(void (^)(NSURL * _Nullable url, NSError * _Nullable error))completion
 {
+    MTR_LOG("%@ downloadLogOfType: %lu, timeout: %f", self, static_cast<unsigned long>(type), timeout);
+
     auto * baseDevice = [self newBaseDevice];
+
+    mtr_weakify(self);
     [baseDevice downloadLogOfType:type
                           timeout:timeout
                             queue:queue
-                       completion:completion];
+                       completion:^(NSURL * _Nullable url, NSError * _Nullable error) {
+                           mtr_strongify(self);
+                           MTR_LOG("%@ downloadLogOfType %lu completed: %@", self, static_cast<unsigned long>(type), error);
+                           completion(url, error);
+                       }];
 }
 
 #pragma mark - Cache management

src/darwin/Framework/CHIP/MTRDiagnosticLogsDownloader.mm

@@ -23,6 +23,7 @@
 #include <protocols/bdx/BdxTransferServerDelegate.h>
 #include <protocols/bdx/DiagnosticLogs.h>
 
+#import "MTRDeviceControllerFactory_Internal.h"
 #import "MTRDeviceController_Internal.h"
 #import "MTRError_Internal.h"
 #import "MTRLogging_Internal.h"
@@ -260,6 +261,7 @@ - (BOOL)matches:(NSString *)fileDesignator
 
 - (void)failure:(NSError * _Nullable)error
 {
+    MTR_LOG("%@ Diagnostic log transfer failure: %@", self, error);
     _finalize(error);
 }
 
@@ -461,6 +463,9 @@ - (void)downloadLogFromNodeWithID:(NSNumber *)nodeID
         auto err = _bridge->StartBDXTransferTimeout(download, timeoutInSeconds);
         VerifyOrReturn(CHIP_NO_ERROR == err, [download failure:[MTRError errorForCHIPErrorCode:err]]);
     }
+
+    MTR_LOG("%@ Started log download attempt for node %016llX-%016llX (%llu)", download,
+        controller.compressedFabricID.unsignedLongLongValue, nodeID.unsignedLongLongValue, nodeID.unsignedLongLongValue);
 }
 
 - (void)abortDownloadsForController:(MTRDeviceController_Concrete *)controller;
@@ -477,9 +482,15 @@ - (void)handleBDXTransferSessionBeginForFileDesignator:(NSString *)fileDesignato
                                           abortHandler:(AbortHandler)abortHandler;
 {
     assertChipStackLockedByCurrentThread();
-    MTR_LOG("BDX Transfer Session Begin for log download: %@", fileDesignator);
 
     auto * download = [_downloads get:fileDesignator fabricIndex:fabricIndex nodeID:nodeID];
+
+    auto * controller = [[MTRDeviceControllerFactory sharedInstance] runningControllerForFabricIndex:fabricIndex.unsignedCharValue];
+
+    MTR_LOG("%@ BDX Transfer Session Begin for log download: %016llX-%016llX (%llu), %@", download,
+        controller.compressedFabricID.unsignedLongLongValue, nodeID.unsignedLongLongValue, nodeID.unsignedLongLongValue,
+        fileDesignator);
+
     VerifyOrReturn(nil != download, completion([MTRError errorForCHIPErrorCode:CHIP_ERROR_NOT_FOUND]));
 
     download.abortHandler = abortHandler;
@@ -493,9 +504,15 @@ - (void)handleBDXTransferSessionDataForFileDesignator:(NSString *)fileDesignator
                                            completion:(MTRStatusCompletion)completion
 {
     assertChipStackLockedByCurrentThread();
-    MTR_LOG("BDX Transfer Session Data for log download: %@: %@", fileDesignator, data);
 
     auto * download = [_downloads get:fileDesignator fabricIndex:fabricIndex nodeID:nodeID];
+
+    auto * controller = [[MTRDeviceControllerFactory sharedInstance] runningControllerForFabricIndex:fabricIndex.unsignedCharValue];
+
+    MTR_LOG("%@ BDX Transfer Session Data for log download: %016llX-%016llX (%llu), %@: %@", download,
+        controller.compressedFabricID.unsignedLongLongValue, nodeID.unsignedLongLongValue, nodeID.unsignedLongLongValue,
+        fileDesignator, data);
+
     VerifyOrReturn(nil != download, completion([MTRError errorForCHIPErrorCode:CHIP_ERROR_NOT_FOUND]));
 
     NSError * error = nil;
@@ -511,9 +528,15 @@ - (void)handleBDXTransferSessionEndForFileDesignator:(NSString *)fileDesignator
                                                error:(NSError * _Nullable)error
 {
     assertChipStackLockedByCurrentThread();
-    MTR_LOG("BDX Transfer Session End for log download: %@: %@", fileDesignator, error);
 
     auto * download = [_downloads get:fileDesignator fabricIndex:fabricIndex nodeID:nodeID];
+
+    auto * controller = [[MTRDeviceControllerFactory sharedInstance] runningControllerForFabricIndex:fabricIndex.unsignedCharValue];
+
+    MTR_LOG("%@ BDX Transfer Session End for log download: %016llX-%016llX (%llu), %@: %@", download,
+        controller.compressedFabricID.unsignedLongLongValue, nodeID.unsignedLongLongValue, nodeID.unsignedLongLongValue,
+        fileDesignator, error);
+
     VerifyOrReturn(nil != download);
 
     VerifyOrReturn(nil == error, [download failure:error]);
@@ -641,6 +664,12 @@ - (void)handleBDXTransferSessionEndForFileDesignator:(NSString *)fileDesignator
     auto * download = (__bridge MTRDownload *) context;
     VerifyOrReturn(nil != download);
 
+    auto * controller = [[MTRDeviceControllerFactory sharedInstance] runningControllerForFabricIndex:download.fabricIndex.unsignedCharValue];
+
+    MTR_LOG("%@ Diagnostic log transfer timed out for %016llX-%016llX (%llu), abortHandler: %@", download,
+        controller.compressedFabricID.unsignedLongLongValue, download.nodeID.unsignedLongLongValue,
+        download.nodeID.unsignedLongLongValue, download.abortHandler);
+
     // If there is no abortHandler, it means that the BDX transfer has not started.
     // When a BDX transfer has started we need to abort the transfer and we would error out
     // at next poll. We would end up calling OnTransferEnd and eventually [download failure:error].