sendPDU
return sendPDU(sess, &spp, handledDiscoveryResp);
return sendPDU(sess, &spp, handleLogoutResp);
int sendPDU(isess_t *sess, pdu_t *pp, handler_t *hdlr);
return sendPDU(sess, &spp, handleLoginResp);
return sendPDU(sess, &spp, handleChap);
status = sendPDU(sess, &spp, handleLoginResp);