[lwip-devel] [bug #55607] MQTT assert when length of received message > MQTT_VAR_HEADER_BUFFER_LEN

[David GIRAULT]

Follow-up Comment #2, bug #55607 (project lwip):

Seen another problem with mqtt_parse_incoming() that may not call
mqtt_message_received() if remaining part of current buffer isn't equal to
buffer_space! 
This is almost all time the case when called from altcp_tls socket.

The second patch address this and additionally allow working mostly in
zero-copy mode.

Using a MQTT_VAR_HEADER_BUFFER_LEN of 1520 will allow zero-copy for all
received frame (when connected through TLS).

In our architecture, working on pbuf is faster than in `client->rx_buffer`
because not in same memory space (SRAM vs. SDRAM).


(file #46134)
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Additional Item Attachment:

File name: 0002-mqtt-support-mostly-zero-copy-message-analysis.patch Size:4 KB
   
<https://savannah.nongnu.org/file/0002-mqtt-support-mostly-zero-copy-message-analysis.patch?file_id=46134>



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