[lwip-users] Re transmission try no response

[Fred39]

Hi LWIP Users

I finaly got the lwip stack working on my device. The problem was that i
didnt set memory options well ,too less memory. 
My application using the modbus tcp protocol and after a while I get an
Retransmission try (4 Times) from my PC to the device and than my device
stops to response to the pc. This happends when in various times sometimes
after 1 hour sometimes after 10 min and sometimes after 30seconds.
Can this still be an configuration error of the stack? Still to less memory?

My device drive end up in a can_send loop of the ethernet driver.

Here a trace from wireshark
152950  8727.023524     192.168.1.1     192.168.1.222   Modbus/TCP      66      
   query [ 1
pkt(s)]: trans:    90; unit:   0, func:   6: Write single register. 
152951  8727.325545     192.168.1.1     192.168.1.222   Modbus/TCP      66      
[TCP
Retransmission]    query [ 1 pkt(s)]: trans:    90; unit:   0, func:   6:
Write single register. 
152952  8727.922536     192.168.1.1     192.168.1.222   Modbus/TCP      66      
[TCP
Retransmission]    query [ 1 pkt(s)]: trans:    90; unit:   0, func:   6:
Write single register. 
152954  8728.066608     192.168.1.1     192.168.1.222   TCP     54      51651 > 
asa-appl-proto
[FIN, ACK] Seq=1081 Ack=1069 Win=63172 Len=0
152956  8729.129649     192.168.1.1     192.168.1.222   Modbus/TCP      66      
[TCP
Retransmission]    query [ 1 pkt(s)]: trans:    90; unit:   0, func:   6:
Write single register. 

Any Suggestions? 

Regards
Fred
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