Index: qtconnectivity-opensource-src-5.12.5/src/bluetooth/qlowenergycontroller_bluezdbus.cpp
===================================================================
--- qtconnectivity-opensource-src-5.12.5.orig/src/bluetooth/qlowenergycontroller_bluezdbus.cpp
+++ qtconnectivity-opensource-src-5.12.5/src/bluetooth/qlowenergycontroller_bluezdbus.cpp
@@ -950,7 +950,11 @@ void QLowEnergyControllerPrivateBluezDBu
             if (charData.uuid != QBluetoothUuid(gattChar.characteristic->uUID()))
                 continue;
 
-            QDBusPendingReply<> reply = gattChar.characteristic->WriteValue(nextJob.value, QVariantMap());
+            QVariantMap options;
+            // The "type" option only works with BlueZ >= 5.50, older versions always write with response
+            options[QStringLiteral("type")] = nextJob.writeMode == QLowEnergyService::WriteWithoutResponse ?
+                QStringLiteral("command") : QStringLiteral("request");
+            QDBusPendingReply<> reply = gattChar.characteristic->WriteValue(nextJob.value, options);
             QDBusPendingCallWatcher* watcher = new QDBusPendingCallWatcher(reply, this);
             connect(watcher, &QDBusPendingCallWatcher::finished,
                     this, &QLowEnergyControllerPrivateBluezDBus::onCharWriteFinished);