[lwip-users] tcp_connection (no SYN packet on server side)

[inderjit]

Hi,

I'm new to LWIP and trying to get tcp/ip protocol working with static ip.

I have SAM4E based MCU that is to be worked as client and I'm just mocking a server on raspberry pi (no implementation so far, only monitoring using tcpdump and iptables. The devices are connected by ethernet cable RJ45.

My current setting is:
#define NO_SYS				1
#define LWIP_NETIF_STATUS_CALLBACK	1
//#define DHCP_USED
#define MEMP_NUM_TCP_PCB		2
#define MEMP_NUM_TCP_PCB_LISTEN		1
#define LWIP_TCP			1

The following code goes without any problems:
	ip_addr_t ip;
	uint32_t data = ""

	pcb_tcp = tcp_new();

	/* register callbacks */
	tcp_err(pcb_tcp , tcp_err_cb);
	tcp_recv(pcb_tcp , tcp_recv_cb);
	tcp_sent(pcb_tcp , tcp_sent_cb);

	tcp_arg(pcb_tcp, (void*) &data);
	
	/* bind to address and port */
	IP4_ADDR(&ip, 192, 168, 100, 250);
	tcp_bind(pcb_tcp, &ip, 8080);

	IP4_ADDR(&ip, 192, 168, 100,155);
	err = tcp_connect(pcb_tcp, &ip, 8080, tcp_connected_cb);
	if (err != 0) {
		LWIP_ASSERT("err != 0", 0);
	}

On my server side (raspberry pi I'm  monitoring all packages received by tcpdump and iptables.

After a while I get a timeout and consequently
ERR_ABRT
on callback which is OK. BUT I am not seeing any packages i.e no SYN packets being received on server side although on client it says:
pcb_tcp->state =SYN_SENT

Should I not? Am I missing something?

Thanks in advance.
Indy

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