Bruno what you think of this?
On Montag, August 4, 2003, at 10:55 Uhr, Holger Seiferth wrote:
Hi,Andreas Fink
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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