Represents the options that can be configured for a given socket.
std::optional< nng_duration > req_resend_time
NNG_OPT_REQ_RESENDTIME.
std::optional< nng_duration > recv_timeout
NNG_OPT_RECVTIMEO.
std::optional< nng_duration > req_resend_tick
NNG_OPT_REQ_RESENDTICK.
std::optional< nng_duration > send_timeout
NNG_OPT_SENDTIMEO.