Log the outgoing write values and command payloads in MTRBaseDevice.

Note that this is the code MTRDevice_Concrete ends up calling into, so this logs
the MTRDevice_Concrete behavior as well.

Author: bzbarsky-apple

src/darwin/Framework/CHIP/MTRBaseDevice.mm

@@ -1158,6 +1158,8 @@ - (void)writeAttributeWithEndpointID:(NSNumber *)endpointID
                                queue:(dispatch_queue_t)queue
                           completion:(MTRDeviceResponseHandler)completion
 {
+    MTR_LOG("%@ write %@ 0x%llx 0x%llx: %@", self, endpointID, clusterID.unsignedLongLongValue, attributeID.unsignedLongLongValue, value);
+
     auto * bridge = new MTRDataValueDictionaryCallbackBridge(queue, completion,
         ^(ExchangeManager & exchangeManager, const SessionHandle & session, MTRDataValueDictionaryCallback successCb,
             MTRErrorCallback failureCb, MTRCallbackBridgeBase * bridge) {
@@ -1367,6 +1369,8 @@ - (void)_invokeCommandWithEndpointID:(NSNumber *)endpointID
         timeoutMs = MTRClampedNumber(timeoutMs, @(1), @(UINT16_MAX));
     }
 
+    MTR_LOG("%@ invoke %@ 0x%llx 0x%llx: %@", self, endpointID, clusterID.unsignedLongLongValue, commandID.unsignedLongLongValue, commandFields);
+
     auto * bridge = new MTRDataValueDictionaryCallbackBridge(queue, completion,
         ^(ExchangeManager & exchangeManager, const SessionHandle & session, MTRDataValueDictionaryCallback successCb,
             MTRErrorCallback failureCb, MTRCallbackBridgeBase * bridge) {
@@ -2148,6 +2152,12 @@ - (void)downloadLogOfType:(MTRDiagnosticLogType)type
                                       completion:completion];
 }
 
+- (NSString *)description
+{
+    return [NSString
+        stringWithFormat:@"<%@: %p, node: %016llX-%016llX (%llu)>", NSStringFromClass(self.class), self, _deviceController.compressedFabricID.unsignedLongLongValue, _nodeID, _nodeID];
+}
+
 @end
 
 @implementation MTRBaseDevice (Deprecated)