Re: [lwip-devel] Issue related to Tcp Server max connections

[Zach Smith]

As for your question #1:

It is by design that any new connection of same or greater priority than an 
already existing connection replaces the older connection.  If you want to 
ensure that a connection does not get overwritten by a new connection I think 
you can use tcp_setprio(struct tcp_pcb *pcb, u8_t prio) to set its priority 
higher than the default.  The default is TCP_PRIO_NORMAL when a new connection 
is created.  See the following:
tcp_new(void)
tcp_alloc(u8_t prio)
tcp_setprio(struct tcp_pcb *pcb, u8_t prio)

-Zach


-----Original Message-----
From: address@hidden [mailto:address@hidden On Behalf Of Ishmeet
Sent: Thursday, June 27, 2013 5:38 AM
To: address@hidden
Subject: [lwip-devel] Issue related to Tcp Server max connections

Hello guys,

I have been using Lwip 1.4.1 on STM32L151 embedded board, most of the things 
like udp tcp dhcp ping are working but I am facing some issues with them,

1. When module(embedded board) acts as tcp server with maximum 4 
connections(meaning 4 tcp clients can connect simultaneously), and I start 
connecting on IP address and port no. from a standard PC utility, then 5th 
client also connects and it disconnects the first client which was already 
connected. This has caused me a loss of client that was already in process of 
data transmission. This is what I have set in lwipopts.h

#define MEMP_NUM_TCP_PCB        4               //10
/* MEMP_NUM_TCP_PCB_LISTEN: the number of listening TCP
   connections. */
#define MEMP_NUM_TCP_PCB_LISTEN 4       //6
/* MEMP_NUM_TCP_SEG: the number of simultaneously queued TCP
   segments. */

2. when I try to ping a remote IP address (like IP addr of google.com) using 
ping_send_now api in ping.c, I only see ping request going from module,no ping 
reply's.
 Actually it should arp our router for this process to happen. Is this a bug or 
I did'nt read the user documents for it and there is a macro kind of to be 
enable.

Little knowledge sharing will be much appreciated.

Ishmeet



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