Mms takes many attempts to download

REPRODUCIBILITY: always
OS VERSION: 4.6.0.15-xqbt52-1.0.1.14
HARDWARE: Xperia 10 III
UI LANGUAGE: English
REGRESSION: no

DESCRIPTION:

MMS downloads work, but take many many attempts. When I receive an MMS, it invariably fails to download. I start the download again, then try the following things in combination, waiting various amounts of time:

  • disable wifi (or sometimes, in despair, enabling wifi)
  • restart mms-engine
  • restart ofono
  • change MMS IPv4 => IPv6 => dual
  • change mobile data IPv4 => IPv6 => dual

It generally takes about 5 full minutes to work. Sometimes, the MMS will download the instant a stop ofono, indicating that it had already downloaded correctly and was just hanging on ack or something. More often, restarting mms-engine will cause it to work fairly normally after about 5 seconds.

This happens regardless of MMS size. Text-only MMS messages have the same symptoms as 1MiB MMS messages.

PRECONDITIONS:

Receive an MMS

STEPS TO REPRODUCE:

It seems to be reliable to do just the following:

  • hit cancel download
  • disable wifi + set mobile=IPv4 + set mms=Dual + restart ofono
  • hit download mms + restart mms-engine + restart ofono
  • then, in a loop: restart mms-engine + download mms, maybe about 20 times.

EXPECTED RESULT:

MMS downloads on the first attempt, or better yet, automatically, without failing.

ACTUAL RESULT:

MMS takes 20+ attempts to download.

MODIFICATIONS:

No relevant modifications.

ADDITIONAL INFORMATION:

Attached is one attempt, just now, taking the path in steps-to-reproduce. It downloaded correctly in the end. I don’t know enough about networking, especially IPv6/CLAT/etc to tell if there is anything relevant in it.

Logs have only the following replacements: IMEI=333666777888999, sender=15554442222, recipient=15554443333. If anyone notices that there is any personal info in there I should not be sharing publicly, please let me know.

2 Likes

logs in xz’d tar file encoded in base64 with wrapper script to extract:

#!/bin/sh
B64="
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"
echo "$B64" | base64 -d > 20241022_104119_mms-engine-logs.tar.xz
xz -d 20241022_104119_mms-engine-logs.tar.xz
tar -xf 20241022_104119_mms-engine-logs.tar
1 Like

Oh, nice. I’ll have to steal that!

For me mms worked only on 3g, maybe turning ipv4<->6 has a side effect of dropping you to 3g and it happens to download in this window? Worth a try as a reliable workaround if it works

thanks, but 3G does not exist in my country

1 Like

Probably carrier dependent, what about 2g? The only thing I know for sure is no matter how many attempts on 4g all resulted in failure for me for whatever reason, worth a try

yea, a good idea. 2G is very limited here, but was worth trying.

i just tried for a solid 30 minutes on 2G-only, and could not get it to download. ofono icon said 2.5G. probably the connection is too spotty.

every successful MMS download so far has been definitely on lte (10 III nr bands are not available here) with ofono icon 4G

1 Like

ok, i confirmed the problem is DEFINITELY with ‘Ack’. i modified mms-engine like this:

wolke:~/Code/mms-engine$ git diff
diff --git a/mms-lib/src/mms_task_ack.c b/mms-lib/src/mms_task_ack.c
index b9ed5d6..a49abb4 100644
--- a/mms-lib/src/mms_task_ack.c
+++ b/mms-lib/src/mms_task_ack.c
@@ -53,6 +53,7 @@ mms_task_ack_new(
     MMSTransferList* transfers,
     const char* tx_id)
 {
+    return NULL;
     MMSTask* task = NULL;
     const char* file = mms_task_ack_encode(task_config(parent),
         mms_task_sim_settings(parent), parent->id, tx_id);

built and installed the new RPMs, and it immediately fixed my problem.

when not on wifi, MMS now works consistently first try, though of course without ack.

also, i am now almost certain that MMS never works when i am on wifi.

2 Likes

Using shar might be easier.

1 Like

i suppose that’s the standard for silly things like developer forums without any way to attach log files, but i personally never liked shar. the uuencode nonsense it uses has `s all over the place. its scary to paste into a terminal, plus it’s easy to hide malicious code in them. just my own weird take, i guess

Do you have ‘Send read receipts’ turned on in Settings > Apps > Messages > MMS? Does disabling that help (using the original mms-engine)?

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read-receipts was turned off for every test above. i did try turning it on once a few days ago, and it did seem to change the output of mms-engine, but it didn’t make MMS work any better or any worse, as far as i could tell.