[mdns] Show interface on mDns failures. (#15266)

* [mdns] Show interface on mDns failures.

* [log] Deescalate bad interface log from error to detail.

* [mdns] Comment resolution.

* [mdns] Handle interface name error.

* [restyle]

src/lib/dnssd/minimal_mdns/Server.cpp

@@ -386,8 +386,14 @@ CHIP_ERROR ServerBase::BroadcastImpl(chip::System::PacketBufferHandle && data, u
             }
             else
             {
-                ChipLogError(Discovery, "Attempt to mDNS broadcast failed:  %s", chip::ErrorStr(err));
                 lastError = err;
+#if CHIP_DETAIL_LOGGING
+                char ifaceName[chip::Inet::InterfaceId::kMaxIfNameLength];
+                err = info->mInterfaceId.GetInterfaceName(ifaceName, sizeof(ifaceName));
+                if (err != CHIP_NO_ERROR)
+                    strcpy(ifaceName, "???");
+                ChipLogDetail(Discovery, "Warning: Attempt to mDNS broadcast failed on %s:  %s", ifaceName, lastError.AsString());
+#endif
             }
             return chip::Loop::Continue;
         }))