SMPP Throttling error processing

Hi all,

I've noticed that after receiving SMPP throttling error 0x58 the message
that hit the limit is moved to the end of the outgoing_sms queue
via bb_smscconn_send_failed() in bb_smscconn.c.
I suggest to keep it in the msgs_to_send queue with the same parameters as
before the error occurred to have it processed first after the throttling
condition is over.

I did the following patch to smsc/smsc_smpp.c in "case submit_sm_resp:"
section from line 1609:
change
***
if (pdu->u.submit_sm_resp.command_status == SMPP_ESME_RTHROTTLED)
    time(&(smpp->throttling_err_time));
else
    smpp->throttling_err_time = 0;

bb_smscconn_send_failed(smpp->conn, msg, reason, octstr_format("0x%08lx/%s",
pdu->u.submit_sm_resp.command_status,

 smpp_error_to_string(pdu->u.submit_sm_resp.command_status)));
***
to
***
if (pdu->u.submit_sm_resp.command_status == SMPP_ESME_RTHROTTLED) {
    time(&(smpp->throttling_err_time));
    /* Put the message back into the SMPP queue */
    gw_prioqueue_produce(smpp->msgs_to_send, msg);
} else {
    smpp->throttling_err_time = 0;
    bb_smscconn_send_failed(smpp->conn, msg, reason,
octstr_format("0x%08lx/%s", pdu->u.submit_sm_resp.command_status,
        smpp_error_to_string(pdu->u.submit_sm_resp.command_status)));
}
***

and in sms.c I have changed the function sms_priority_compare() to reverse
time sorting order (for some reason it was LIFO):
if (msg1->sms.time > msg2->sms.time)
    ret = -1;
else if (msg1->sms.time < msg2->sms.time)
    ret = 1;