[lwip-users] One active TCP connection at a time

[Jeffrey Nichols]

Hi,

I'm trying to figure out the best way to have only one incoming TCP 
connection active at a time.

I inherited some code that calls tcp_close() on the listening pcb inside 
the tcp_accept callback, and creates a new listener later when the 
active connection is closed. I'm not certain that this is the best way 
to do this, and suspect there may be edge cases that will be missed. The 
listener has to set the SOF_REUSEADDR option whenever it gets created to 
make everything work.

I've been trying to familiarize myself with lwip and looking to see if 
there's a supported way to achieve this functionality. Some other 
options that occur to me are using TCP_LISTEN_BACKLOG or calling 
tcp_abort on all of the new pcbs inside the tcp_accept callback.

Does anyone have any advice for the best way to achieve only one active 
connection at a time?

Thanks,
Jeff