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The recommended and right method of using low power features in mesh nodes is to define WICED_BT_MESH_CORE_FEATURE_BIT_LOW_POWER in wiced_bt_mesh_core_config_t and provide a LPN sleep callback in wiced_bt_mesh_app_func_table_t, So that the mesh stack can generate the appropriate event as and when needed and use the mesh LPN libraries. The application can still decide whether it wants to go to sleep, appropriate sleep mode, etc. using this wiced_bt_mesh_app_lpn_sleep_t function.
If you try to implement the Low Power modes without informing the stack the mesh network may not work properly.
I would suggest you to refer low_power_led mesh application and implement the LPN in a recommended way.
Ok then ...
LPN mode works already, I just test the sleep function without making use LPN ... I just want to test something without LPN where mesh device keep on asking and searching the friend node when it wakes up.
In short, in mesh ... you need low power, just use LPN then ... thanks.