Add delay

code/test/test_suite_flowcontroll.cpp

@@ -108,6 +108,8 @@ void initGPIO()
  */
 void task_UnityTesting(void *pvParameter)
 {
+    vTaskDelay( 5000 / portTICK_PERIOD_MS ); // 5s delay to ensure established serial connection
+    
     UNITY_BEGIN();
         RUN_TEST(test_getReadoutRawString);
         printf("---------------------------------------------------------------------------\n");