ngtcp2_conn_initiate_key_update
===============================

Synopsis
--------

*#include <ngtcp2/ngtcp2.h>*

.. function:: int ngtcp2_conn_initiate_key_update(ngtcp2_conn *conn, ngtcp2_tstamp ts)

    
    `ngtcp2_conn_initiate_key_update` initiates the key update.
    
    This function returns 0 if it succeeds, or one of the following
    negative error codes:
    
    :macro:`NGTCP2_ERR_INVALID_STATE`
        The previous key update has not been confirmed yet; or key
        update is too frequent; or new keys are not available yet.