[lwip-users] ping is going up and down

[Nico Sachs]

Hi,

i think my lwip implementation run into a problem after a certain time, and i 
don't know what it could be..

So now my application: I run the stable 1.4.1 version. I have httpserver_raw 
activated, a tcp listener and a udp listener. I can initate, by another client 
a connection where my application sends each 30ms some small data (min. eth 
packet)  over UDP and i also get some Data each 15ms. 

I can see the application work for at least 5 minutes perfectly. in this time, 
i can see the ping is increasing from 1ms up to 100ms. (It rises very slowly). 
After a while the other client think the connection broke and stop sending. 
Afterwards it tries to reconnect. This reconnection work.

I also spotted that sometimes the ping goes down to a normal level and the 
application work again for a certain time, sometimes 5min, sometimes 10min.

After the communications stops, i noticed that also my website is not 
responding for 1-2 seconds.

Some more details:
i run freertos with mainly just the tcpip_thread and a tick task to kick on the 
udp send. the Idle task is running for 98%. 
Ethernet input is solved by interrupt to give a semaphore catched by another 
task. 

According to lwip Stats. i see approx. 200 udp protocol errors and a slightly 
lower value in invalid length error in IP packets in 24h. But with an eye on 
the number of packets are transferred in this time, i think it's not very high.

I mention that i can not run some mem stats while im using my own heap, isn't 
it?

I have no idea, what this could be.
Does someone has an idea?

Thanks