Re: problem with CMG and one mutual SEND/RCV connection

if this is really the case, then we have a bug to fix.
Bruno what you think of this?

On Montag, August 4, 2003, at 10:55  Uhr, Holger Seiferth wrote:

> Hi,
> when using kannel with CMG SMSC and a provider which uses one 
> connection to
> do both sending and receiving messages (incl. notification) there 
> seems to be
> a kind of "Dead Lock" problem with sending messages and sending
> notifications. Situation is like this (I tried to simplify the 
> description to make it
> easier to understand):
> I send 100 messages to Kannel. Kannel puts those 100 messages into its 
> send
> queue. Then it sends out the first 5 messages (assuming WindowsSize is 
> 5).
> Then I get back 5 ACKs and 5 notifications. After I got back the ACKs, 
> Kannel
> sends out the next 5 messages. Then I get back 5 ACKs and 5 
> notifications, and
> so on.
> The problem is:
> Kannel seems to put the ACKs to the notifications in the same queue as 
> the
> outgoing messages without any priority. So those ACKs are not sent 
> until the
> last of the 100 MOs was sent. But we get into trouble, because the CMG 
> SMSC
> keeps waiting for those ACKs and since they don't come, it's assuming 
> that our
> side (meaning Kannel) is busy, so it delays sending the MT ACKs.
> Finally, we get into the situation when Kannel waits for MT ACKs 
> (because
> CMG refuses sending them) and CMG waits for notification ACKs, since 
> they are
> in the Kannel message queue.
> I think, to prevent this, Kannel would have to send any ACKs before 
> sending
> any messages, meaning Kannel needs to set a higher priority on ACKs 
> than on
> MTs.
> Is there any (configuration) solution for this problem?
> Thanks!
>
> Kind regards,
> Holger
>
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Andreas Fink
Global Networks Switzerland AG

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