increase stack size for test runner task
#define mainLOGGING_TASK_STACK_SIZE ( configMINIMAL_STACK_SIZE * 5 )
#define mainLOGGING_MESSAGE_QUEUE_LENGTH ( 15 )
-#define mainTEST_RUNNER_TASK_STACK_SIZE ( configMINIMAL_STACK_SIZE * 16 )
+#define mainTEST_RUNNER_TASK_STACK_SIZE ( configMINIMAL_STACK_SIZE * 20 )
/* The default IP and MAC address used by the demo. The address configuration
* defined here will be used if ipconfigUSE_DHCP is 0, or if ipconfigUSE_DHCP is
