Hi ,I need help!
When send >3 segments ,it's easy cause the following error.
HW: stm32H750+freertos+lwip+lwip mqtt ; stm32cubemx create project;
TCP_INPUT_DEBUG and TCP_OUTPUT_DEBUG set ON , the following is debug log(
"//" is my comment):
===========================debug log====================================
[15:22:00.452] Tmpx=push/full
[15:22:00.452] ###push_all=1492 mqtt_publish: Publish with payload length
1492 to topic "push/full" //push need send
1492+14=1506 bytes
[15:22:00.488]
[15:22:00.492] @@MQOSD4 mqtt_output_send: tcp_sndbuf: 4096 bytes,
ringbuf_linear_available: 304, get 2196, put 1202
[15:22:00.492] tcp_write(pcb=20011664, data=20004518, len=304, apiflags=3)
[15:22:00.512]
[15:22:00.512]
[15:22:00.512] @@@TWC=4,304,4096,0 // 304 bytes;
[15:22:00.512]
[15:22:00.512] tcp_write: queuelen: 0
[15:22:00.528]
[15:22:00.532] tcp_write: queueing 83706:84010 //segment 1 is 304 bytes
[15:22:00.532] tcp_write: 1 (after enqueued)
[15:22:00.552] tcp_write(pcb=20011664, data=20003c84
[15:22:00.561] tcp_output_segment: 83706:84010 //send segment1 (304
Bytes);
[15:22:00.569] , len=1202, apiflags=1)
[15:22:00.572]
[15:22:00.572]
[15:22:00.572] @@@TWC=4,1202,3792,1 //need send 1202 bytes; the
following two segment 1024+178;
[15:22:00.572]
[15:22:00.572] tcp_write: queuelen: 1
[15:22:00.572] tcp_write: queueing 84010:85034 //segment 2 is 1024 bytes
[15:22:00.590] tcp_write: queueing 85034:85212 //segment 3 is 178
bytes; the totle bytes is 304+1024+178=1506bytes;
[15:22:00.592] tcp_write: 3 (after enqueued)
[15:22:00.592]
[15:22:00.592] tcp_output_segment: 84010:85034 //send segment2 (1024 Bytes);
[15:22:00.600]
[15:22:00.602] ---tcp_input---
[15:22:00.602] tcp_output: sending ACK for 2995636869
[15:22:00.602]
[15:22:00.602] tcp_output_segment: 84010:85034 // why send segment2
twice??? This action create error following, segment2 is one segment,send
twice ,the server ACK twice,
//free segment2 twice, when queuelen=0, free segment,queuelen=0-1=65535;
please see[15:22:00.662] and[15:22:00.672] log
[15:22:00.602]
[15:22:00.602] ---tcp_input---
[15:22:00.602] tcp_receive: ACK for 85034, unacked->seqno 83706:84010
//receive segment1 ACK
[15:22:00.602] tcp_receive: removing 83706:84010 from pcb->unacked
[15:22:00.602] tcp_receive: queuelen 3 ... 2 (after freeing
unacked) //queuelen=3-1=2
[15:22:00.602] tcp_receive: removing 84010:85034 from pcb->unacked
//receive segment2 ACK
[15:22:00.602] tcp_receive: queuelen 2 ... 1 (after freeing
unacked) //queuelen=1-1=1
[15:22:00.602]
[15:22:00.602] mqtt_tcp_sent_cb: Calling QoS 0 publish complete callback
[15:22:00.612]
[15:22:00.612]
[15:22:00.612] **pub_cb=1
[15:22:00.612]
[15:22:00.612] ***Publish ok=0
[15:22:00.612]
[15:22:00.612]
[15:22:00.612] @@MQOSD1
[15:22:00.612] tcp_output_segment: 85034:85212 //send segment3 (178 bytes)
[15:22:00.612]
[15:22:00.612] ---tcp_input---
[15:22:00.650]
[15:22:00.653] ---tcp_input---
[15:22:00.653] tcp_receive: ACK for 85212, unacked->seqno 85034:85212
//receive segment3 ACK
[15:22:00.653] tcp_receive: removing 85034:85212 from pcb->unacked
[15:22:00.653] tcp_receive: queuelen 1 ... 0 (after freeing
unacked)
//queuelen=1-1=0 , no segment.
[15:22:00.662] tcp_receive: removing 3232235551:3232235855 from
pcb->unsent
// How to understand this?? 3232235551:3232235855 is error segment
[15:22:00.662] tcp_receive: queuelen 0 ... Assertion "pcb->snd_queuelen
>= pbuf_clen(next->p)" failed at line 1112 in
../Middlewares/Third_Party/LwIP/src/core/tcp_in.c
[15:22:00.662] Assertion "pbuf_free: p->ref > 0" failed at line 753 in
../Middlewares/Third_Party/LwIP/src/core/pbuf.c
[15:22:00.672] 65535 (after freeing unsent)
[15:22:00.672] tcp_receive: removing 84010:85034 from pcb->unsent
[15:22:00.672] tcp_receive: queuelen 65535 ... Assertion "pbuf_free: p->ref
> 0" failed at line 753 in
../Middlewares/Third_Party/LwIP/src/core/pbuf.c //65535=0-1
[15:22:00.672] 65534 (after freeing unsent)
[15:22:00.672] Assertion "tcp_receive: valid queue length" failed at line 1122
in ../Middlewares/Third_Party/LwIP/src/core/tcp_in.c
[15:22:00.672]
[15:22:00.672] @@MQOSD1
[15:22:01.102] MQT=0x0B
========================end of debug log============================
In my understand ,send the same segment twice, receive twice ACK,
free/removing the segments twice ,when queuelen=0 and receive ACK free
valid addr(3232235551:3232235855),and queuelen=0-1=65535; what cause send
the same segment twice??
I need help, now lwip MQTT lost connection and work error.
Thanks a lot!
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