rpma_utils_conn_event_2str3

      #include <librpma.h>
      const char *rpma_utils_conn_event_2str(enum rpma_conn_event conn_event);
      enum rpma_conn_event {
              RPMA_CONN_UNDEFINED = -1,
              RPMA_CONN_ESTABLISHED,
              RPMA_CONN_CLOSED,
              RPMA_CONN_LOST,
              RPMA_CONN_REJECTED,
              RPMA_CONN_UNREACHABLE
      };