error code specific operator

Hi,

I have an operator that provide some additional
error specific code in submit_sm_resp and want
that re-submit the message with specific frequency.

I added the new error codes with the case for re-submit
and add a tag in SMPP structure for get this msg type;
that works but the msg are sent 2/3 per second.

It seems io_thread function handle all the msg; so
if I add a counter for skip some rounds 
or a sleep to delay the frequency all the msg are delayed.

I tried to use the throttling error but it delayed all the msg.

Can you help me for this ?

Thanks,
Alex