API for the Buffer Manager of the network stack

int8_t set_excess_policy(int8_t prio, int8_t pref);
/*
This function sets the excess policy of a given priority level to a given value

        PARAMS:                 prio: The priority level
                                pref: The preference type..OVERWRITE or DROP
        RETURNS:                NRK_OK if the setting is assigned correctly
                                NRK_ERROR otherwise
                                                
        ERROR NOS:              INVALID_ARGUMENT if one or more of the input parameters is invalid
        COMMENTS:               user API
*/

int8_t get_excess_policy(int8_t prio);
/*
This function returns the excess policy setting for a given priority level

        PARAMS:         prio: The priority level
        RETURNS:        OVERWRITE or DROP depending on the setting
                        NRK_ERROR otherwise
        
        ERROR NOS:      INVALID_ARGUMENT if the input paramter is invalid
        COMMENTS:       user API
*/