Your observaction is a bit “odd” in the sense that by nature, Kannel should send messages FIFO.
The smpp smsc handles things differently as it takes the priority field into account. The http smsc does not. Apart from that SMS in general is store-and-forward and a particular order is not guaranteed so you cannot rely and that either. Even though that wasn’t your question. You can consider this as a background – I know it’s not a definitive answer, but maybe it helps. == Rene Van: users <users-boun...@kannel.org> Namens Louis Rouxel Verzonden: zaterdag 19 oktober 2019 16:06 Aan: users@kannel.org Onderwerp: Kannel delivering MT in LIFO Hello there, I'm currently having issues with Kannel delivering MTs in LIFO (last in first out) priority mode. I'm using Kannel 1.4.4 and filesystem directory spool storage (Debian jessie, ext4). I'm submitting large amounts of messages (let's call them "batch A)" for via cgi-bin/sendsms http endpoint; they all get ingested in the store. One hour later, some messages are still in queue, and I'm submitting a large amount of another message (let's call them "batch B"), the same way. Both messages are sent without any priority defined. What I'm observing, in such situations, is that delivery of messages from batch A are interrupted when batch B starts, Kannel is now only delivering messages from batch B. Deliveries for batch A will only resume when batch B is finished. I've been trying to understand if Kannel "officially" working in LIFO or FIFO, but can't really get a proper understanding. 9 years ago, Nikos seemed to indicate the queue should work in FIFO https://www.kannel.org/pipermail/users/2010-July/011951.html But that's really not what I'm observing. Also, I found someone suggesting a patch to make Kannel work in FIFO instead of LIFO (that would confirm my supposition) https://stackoverflow.com/questions/37461349/kannel-queue-type But unfortunately this does not get a lot of attention, and I'm not very comfortable changing the source code as I have no experience in C. What do you guys think? Can anyone confirm if Kannel is operating in LIFO and the behaviour I'm observing is normal? Would anyone have a recommendation to achieve a FIFO behaviour without taking too many risks? Thanks a lot, -- Louis
