[lwip-devel] [bug #65257] MQTT fragmentation is not working correctly

[Gerard Zagema]

URL:
  <https://savannah.nongnu.org/bugs/?65257>

                 Summary: MQTT fragmentation is not working correctly
                   Group: lwIP - A Lightweight TCP/IP stack
               Submitter: embitz
               Submitted: Mon 05 Feb 2024 08:03:19 AM UTC
                Category: apps
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None
            lwIP version: 2.1.1


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Follow-up Comments:


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Date: Mon 05 Feb 2024 08:03:19 AM UTC By: Gerard Zagema <embitz>
The current MQTT client 3.1.1 is not capable of receiving fragmented messages.


If your total message length (header+payload) exceeds the input buffer length
or the maximum TCP segment size, then MQTT fails to function correctly. This
could be a problem if you want to send larger messages or if the sending party
decides to reduce the maximum TCP segment size.

The solution presented here does not pretend to be the most beautiful or
smartest solution, but a solution with as few adjustments as possible to the
original.

Attaching files here doesn't work for me (re-attach???) but the files and more
info are here:

https://embitz.org/forum/thread-188.html







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