Hello All,
In further investigation, i found that lwip stack is not sending more than 1400
bytes.where mss value is 1400.
So i think, lwip stack is not getting signal or acknowledgement of 1400 bytes
has transmitted and now reinitialize the buffer for more 1400 byte.
Any recommendation for debug path.
ThanksRahul
On Thursday, May 23, 2019, 6:35:13 PM GMT+5:30, rahul.mane .
<[email protected]> wrote:
Hello All,
I am still investing above issue.
There is one more observation. I am not able to send more than 1024 bytes
using lwip socket operation.
I am sending 128 bytes through lwip socket. And server side i am getting this
bytes correctly.
Above operation works successfully 8 times( i.e. 128*8 =1024). On 9 th times
data is not getting to server.
Any recommendation for debug path.
ThanksRahul
On Monday, May 20, 2019, 4:10:21 PM GMT+5:30, rahul.mane .
<[email protected]> wrote:
Hello All,
I am using LWIP stack (2.0.2) with pppos.I have NXP MC5748 board wi SIM900a
interface with one UART channel.
I am trying to send data to server using LWIP socket programming.
Steps of programming:
1. lwip_socket(PF_INET, SOCK_STREAM, 0);
2. lwip_connect(socket_fd,(struct sockaddr_in*)&sa,sizeof(struct sockaddr_in));
3. lwip_write(socket_fd, "test", 4);
4. lwip_read(socket_fd, rxbuf, 512)
and this above operations are working fine. But there is issue.
Step 3 & 4 ie WRITE & READ are called in WHILE LOOP.
after some number of successful write and read operations, code get stuck in
read operation.
So I have enabled some #define and put some console print, for debugging,.
And my observation is following:
1. while successful operation, I was getting log as
ip_input: iphdr->dest 0x646494b2 netif->ip_addr 0x646494b2 (0x646494b2,
0x646494b2, 0x0)ip4_input: packet accepted on interface pp
2. Getting this log, When read is not getting data :
ip_input: iphdr->dest 0xb8482fbb netif->ip_addr 0x646494b2 (0xb8482fbb,
0x646494b2, 0x0)ip4_input: packet not for us.
my further analysis is /* match packet against an interface, i.e. is this
packet for us? */ if (ip4_addr_ismulticast(ip4_current_dest_addr())) in ip4.c
When Issue occurs, IF conditions gets FAILED
In unsuccessful opertion "ip_data.current_iphdr_dest.addr" is 0xb8482fbb And
for successful operation it is 0x646494b2.
Is above mentioned difference gives some kind of HINT ?
I don't know much about lwip, So please help me to understand this issue and
how to resolve it ?
ThanksRahul
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