diff --git a/OmobiDisplayApp/omobidisplaybackend.cpp b/OmobiDisplayApp/omobidisplaybackend.cpp
index f9017a6..ff3cc48 100644
--- a/OmobiDisplayApp/omobidisplaybackend.cpp
+++ b/OmobiDisplayApp/omobidisplaybackend.cpp
@@ -24,6 +24,10 @@ OmobiDisplayBackend::OmobiDisplayBackend(QObject *parent) : QObject(parent)
 
     this->setState(Idle);
     this->ble->startScanningForDevices();
+
+    qDebug() << QCryptographicHash::hash("HalloTest", QCryptographicHash::Sha256).toHex();
+    // dd86fcfda3a20cbb8fbb3026a84550e0d70c2c79e7e8e36d6ffa04b9eef0401f
+    // dd86fcfda3a20cbb8fbb3026a84550e0d70c2c79e7e8e36d6ffa04b9eef0401f
 }
 
 
@@ -73,6 +77,7 @@ void OmobiDisplayBackend::handleBluetoothDeviceConected() {
     this->setState(Initing);
 
     // tell display to send over existing model data
+    this->sendBluetoothCommand(AuthorizeSessionCommand, QVariantMap{{"secret", QCryptographicHash::hash("1234", QCryptographicHash::Sha256).toHex()}});
     this->sendBluetoothCommand(GetAllTextSetsCommand);
     this->sendBluetoothCommand(GetDisplayBrightnessCommand);
 }
@@ -144,6 +149,8 @@ void OmobiDisplayBackend::handleBluetoothDataReceived(QString s){
 
     switch (header) {
     case AuthorizeSessionCommand: {
+        // TODO: handle error
+        this->refreshLoadingState();
         break;
     }
     case KeepAliveCommand: {
diff --git a/OmobiDisplayApp/omobidisplaybackend.h b/OmobiDisplayApp/omobidisplaybackend.h
index 329f602..f0bdfdb 100644
--- a/OmobiDisplayApp/omobidisplaybackend.h
+++ b/OmobiDisplayApp/omobidisplaybackend.h
@@ -4,6 +4,7 @@
 #include <QObject>
 #include <QTimer>
 #include <QJsonDocument>
+#include <QCryptographicHash>
 
 #include <qbluetoothleuart.h>
 #include <omobidisplaytextmodel.h>