[lwip-users] Missing Ack at TCP connection init using socket interface

[Reither Robert]

Hi lwip-users!

I'm quite fresh at LWIP (and tcpip too) and run into a problem with a missing Ack from the connection starter.
What i want is to open a connection to a webserver, send a GET and read data

OK what i do:

Calling lwip_socket()
calling lwip_connect()
calling lwip_send() .. Sending Get
calling lwip_read() .. get data from webserver

What i get on wire (with etheral) was a SYN->
                                                         <-SYN,ACK
                                                        !!Missing!! ACK ->
                                        GET-cmd

What is missing, is the final ACK from the connection starter, to open the connection.

If i do a wait after the connect (>200ms), the ACK will be sent. Looks like i need to wait for a "fine grained timeout", where the ACK will be sent.

I guess this is not normal behaviour, can somebody tell me what i did wrong or maybe the stack ?

Greetings

Robert