I'm using TCP/IP stack from RL-ARM Library 2.22a and starting point of my project was a sample from Keil LEDSwitch Server.
What i would like to know is what i need to do to be able to receive more then one connection. As currently that is all that i was able to establish.
Here is a debug info that i got when i tried to connect to my HW with second client:
ETH: *** Processing Ethernet frame *** ETH: Dest.MAC: 1E:30:6C:A2:45:5E ETH: Src. MAC: 00:02:B3:CE:32:23 ETH: Frame len: 62 bytes ETH: Protocol: 0800 IP : *** Processing IP frame *** IP : Dest.IP: 192.168.1.90 IP : Src. IP: 192.168.1.12 IP : Frame len: 48 bytes IP : Protocol: 06, Id: AC36 IP : Frame valid, IP version 4 OK ARP: Adding Cache Entry: 192.168.1.12 ARP: Existing Cache Entry 0 refreshed TCP: *** Processing TCP frame *** TCP: Src. Port: 1544 TCP: Dest.Port: 1001 TCP: Seq.Nr: 824812682 TCP: Ack.Nr: 0 TCP: Flags : SYN TCP: Allocated Socket 1, port 1001 TCP: Socket 1, State LISTEN... TCP ERR: Application rejected Connection request TCP: Socket 5, Sending Reset MEM: Allocating 72 bytes MEM: Allocated 1 blocks from IRQ MEM: Used 148 bytes in 2 blocks TCP: Src. Port: 1001 TCP: Dest.Port: 1544 TCP: Seq.Nr: 0 TCP: Ack.Nr: 824812683 TCP: Flags : RST,ACK IP : Sending IP frame... IP : Dest.IP: 192.168.1.12 IP : Src. IP: 192.168.1.90 IP : Frame len: 40 bytes IP : Protocol: 06, Id: 0002 ETH: Sending Ethernet frame... ARP: MAC address resolved from Cache Entry 0 ETH: Dest.MAC: 00:02:B3:CE:32:23 ETH: Src. MAC: 1E:30:6C:A2:45:5E ETH: Frame len: 54 bytes ETH: Protocol: 0800 MEM: Releasing 72 bytes MEM: Used 76 bytes in 1 blocks MEM: Releasing 76 bytes MEM: Used 0 bytes in 0 blocks
I setup 5 TCP Sockets in Net_Config.c
What i tried to create two sockets listening to same port, with same or different callback function. Result was the same.
/* Initialize TCP Socket and start listening */ socket_tcp = tcp_get_socket (TCP_TYPE_SERVER, 0, 60, tcp_callback); if (socket_tcp != 0) { tcp_listen (socket_tcp, LISTEN_TCP_PORT_NUM); } /* Initialize TCP Socket and start listening */ socket_tcp1 = tcp_get_socket (TCP_TYPE_SERVER, 0, 60, tcp_callback); if (socket_tcp1 != 0) { tcp_listen (socket_tcp1, LISTEN_TCP_PORT_NUM); }
I looked at the HTTP sample, where more clients can connect, but i guess all that is done inside the library as all you have access to is Number of HTTP Sessions.
Anyone?
I don't have access to the help files or examples, so I can only part way help since this is from memory.
If you want to listen on a given port number for more than one connection, what you do not do is call listen twice with the same port number.
What I believe you have to do is listen just once and catch the multiple connections in the callback function.
As I say, I cannot remember the exact details offhand, but maybe it can act as a starter for your investigations.
A "normal" stack has one listener and then fork off connections from that.
This is an embedded stack, so this may not apply. A number of stacks are reusing the "listen" socket for the actual communication. I kind of think Keil is doing this. I can't check, since I don't own the Keil stack and hence don't have access to the manuals.