int wait_for_state_change (echo_main_t * em, connection_state_t state,
f64 timeout);
void echo_notify_event (echo_main_t * em, echo_test_evt_t e);
void echo_session_print_stats (echo_main_t * em, echo_session_t * session);
u8 *echo_format_crypto_engine (u8 * s, va_list * args);
uword echo_unformat_crypto_engine (unformat_input_t * input, va_list * args);
int wait_for_state_change (echo_main_t * em, connection_state_t state,
f64 timeout);
void echo_notify_event (echo_main_t * em, echo_test_evt_t e);
void echo_session_print_stats (echo_main_t * em, echo_session_t * session);
u8 *echo_format_crypto_engine (u8 * s, va_list * args);
uword echo_unformat_crypto_engine (unformat_input_t * input, va_list * args);