Hello
I am making a serial tcp bridge device. it works in server mode I have freeRTOS 9, lwip 1.4.1 and STM32F107 device
I wrote the bridging part and for testing purposes I didn't implement buffer to TCP to serial. So Some while receiving data some data piles up in somewhere in tcp thread (I think).
I wrote a python script that sends 2096 characters every second (some lorem ipsum text). serial speed is 115200. So there is enough time to send data and free memory.
But after couple of hours (it is random. sometimes 2 hours sometimes 4 and yesterday it was 12 hours) device cant receive whole data somewhat it is 80 byte parts.and it piles up in tcp part. And after I stop my script I continue to get data from my serial window a few seconds. After memory is empty if I start my script again still same problem.
I enabled stats to see if I am getting out of memory but it looks fine. I couldn't find where my problem is.
There is a web server and an udp server running in device (I didnt send request both server while testing)
I am using socket api
my stats before running test (it sends stat to seperate uart every 10 seconds)
accept_function: newpcb->state: ESTABLISHED
socket Connected
ETHARP
xmit: 5
recv: 43
fw: 0
drop: 0
chkerr: 0
lenerr: 0
memerr: 0
rterr: 0
proterr: 0
opterr: 0
err: 0
cachehit: 32
IP
xmit: 36
recv: 53
fw: 0
drop: 0
chkerr: 0
lenerr: 0
memerr: 0
rterr: 0
proterr: 0
opterr: 0
err: 0
cachehit: 0
TCP
xmit: 2
recv: 35
fw: 0
drop: 0
chkerr: 0
lenerr: 0
memerr: 0
rterr: 0
proterr: 0
opterr: 0
err: 0
cachehit: 0
MEM HEAP
avail: 10240
used: 68
max: 456
err: 0
MEM UDP_PCB
avail: 6
used: 2
max: 3
err: 0
MEM TCP_PCB
avail: 20
used: 1
max: 1
err: 0
MEM TCP_PCB_LISTEN
avail: 5
used: 2
max: 2
err: 0
MEM TCP_SEG
avail: 12
used: 0
max: 1
err: 0
MEM NETBUF
avail: 8
used: 0
max: 0
err: 0
MEM NETCONN
avail: 16
used: 4
max: 4
err: 0
MEM TCPIP_MSG_API
avail: 8
used: 0
max: 0
err: 0
MEM TCPIP_MSG_INPKT
avail: 8
used: 0
max: 3
err: 0
MEM SYS_TIMEOUT
avail: 20
used: 6
max: 6
err: 0
MEM NETDB
avail: 1
used: 0
max: 0
err: 0
MEM PBUF_REF/ROM
avail: 25
used: 0
max: 0
err: 0
MEM PBUF_POOL
avail: 12
used: 0
max: 5
err: 0
SYS
sem.used: 4
sem.max: 5
sem.err: 0
mutex.used: 1
mutex.max: 1
mutex.err: 0
mbox.used: 5
mbox.max: 5
mbox.err: 0
And after the problem (Nothing seems suspicious except cachehit I could't figure out what it is)
ETHARP
xmit: 21
recv: 2811
fw: 0
drop: 9
chkerr: 0
lenerr: 0
memerr: 0
rterr: 0
proterr: 9
opterr: 0
err: 0
cachehit: 41446
IP
xmit: 41449
recv: 37649
fw: 0
drop: 0
chkerr: 0
lenerr: 0
memerr: 0
rterr: 0
proterr: 0
opterr: 0
err: 0
cachehit: 0
TCP
xmit: 1
recv: 36784
fw: 0
drop: 0
chkerr: 0
lenerr: 0
memerr: 0
rterr: 0
proterr: 0
opterr: 0
err: 0
cachehit: 0
MEM HEAP
avail: 10240
used: 68
max: 456
err: 0
MEM UDP_PCB
avail: 6
used: 2
max: 3
err: 0
MEM TCP_PCB
avail: 20
used: 1
max: 1
err: 0
MEM TCP_PCB_LISTEN
avail: 5
used: 2
max: 2
err: 0
MEM TCP_SEG
avail: 12
used: 0
max: 1
err: 0
MEM NETBUF
avail: 8
used: 0
max: 0
err: 0
MEM NETCONN
avail: 16
used: 4
max: 4
err: 0
MEM TCPIP_MSG_API
avail: 8
used: 0
max: 0
err: 0
MEM TCPIP_MSG_INPKT
avail: 8
used: 0
max: 3
err: 0
MEM SYS_TIMEOUT
avail: 20
used: 6
max: 6
err: 0
MEM NETDB
avail: 1
used: 0
max: 0
err: 0
MEM PBUF_REF/ROM
avail: 25
used: 0
max: 0
err: 0
MEM PBUF_POOL
avail: 12
used: 0
max: 6
err: 0
SYS
sem.used: 4
sem.max: 5
sem.err: 0
mutex.used: 1
mutex.max: 1
mutex.err: 0
mbox.used: 5
mbox.max: 5
mbox.err: 0