[lwip-users] Unable to get response for ICMP request sent

[Surjya Padhi]

Hi Geeks,

 

Currently I am working on a project which has following setup

1. Development board is having AVR controller. The development Kit is EVK1105
2. I am using FreeRTOS and for TCPIP, I am using LWIP stack

Currently in LWIP the following 3 things are implemented for ICMP protocol – echo reply, destination unreachable and time exceeded.

I want to send ICMP ping request from my development (where I have FreeRTOS and LWIP) to on external PC. So I downloaded the

Contrib for LWIP which implements the icmp request sending in a freeRTOS thread by creating RAW socket for ICMP. Now when I run it on

My board it does not work. I can send the icmp echo request from my board but not able to receive the reply.

 

Following is the observation I got during testing

1. For sending an ICMP echo request I created a socket and send the request on that socket and the call the “ping_recv” in the same infinite loop. By calling the “ping_recv” function it blocks all other threads like webserver,tftp and snmp etc. But If I comment out the "Ping_recv” function all other threads works.
2. I did another observation also. When I comment out the “ping_recv” function I can detect the ICMP packet received in core lwip functionality In icmp.c , I put a debug statement and I get the icmp packet with ICMP_ER(echo reply) code. But here also all the other freeRTOS threads are Blocked.

Thanks and Regards,

Surjya Narayana Padhi