mpt_send_handshake_cmd
error = mpt_send_handshake_cmd(mpt, sizeof f_req, &f_req);
error = mpt_send_handshake_cmd(mpt, sizeof f_req, &f_req);
if ((error = mpt_send_handshake_cmd(mpt, sizeof init, &init)) != 0) {
int mpt_send_handshake_cmd(mpt_softc_t *, size_t, void *);
mpt_send_handshake_cmd(mpt, sizeof(*mngt_req), mngt_req);