MQX Software SolutionsのトピックHow to test if socket connection is still there?

How to test if socket connection is still there?

drummer — Thu, 29 Oct 2020 09:02:51 GMT

I am using MQX v3.6 with colfire 7.2. I have searched the board and can't find any answer so I'm putting it out there.

How can I check if my socket connection is still there?

I am using accept() and once inside it doesn't return unless the other connection has been aborted.

But what if the cable is diconnected or the connection is lost?

How can I tell?

In my code example I am checking each time that the server on the other side is always the original to prevent some other location from stealing my connection.

   while(socket_flag == TRUE)    {    sock2 = accept(listensock, &raddr, &addr_length);    return_error_if(sock2 == RTCS_SOCKET_ERROR);    if(addr.sin_addr.s_addr == raddr.sin_addr.s_addr)    {     shutdown(sock, FLAG_CLOSE_TX);     fclose(sockfd);     sockfd = fopen("socket:", (char_ptr)sock2);     socket_flag = TRUE;    }    else    {     diag_led_red();     RTCS_time_delay(100);     continue;    }    sock = accept(listensock, &addr, &addr_length);    return_error_if(sock == RTCS_SOCKET_ERROR);    if(addr.sin_addr.s_addr == raddr.sin_addr.s_addr)    {     shutdown(sock2, FLAG_CLOSE_TX);     fclose(sockfd);     sockfd = fopen("socket:", (char_ptr)sock);     socket_flag = TRUE;    }    else    {     diag_led_grn();     RTCS_time_delay(100);     continue;    }           }//while(socket_flag == TRUE)

Re: How to test if socket connection is still there?

Tgomes — Thu, 03 May 2012 23:04:48 GMT

Hi drummer,

I do not know if this resolves your case, but you can at least know if the ethernet cable is connected using the function ipcfg_get_link_active.

Best Regards.

Re: How to test if socket connection is still there?

drummer — Fri, 04 May 2012 02:10:40 GMT

thanks for your input.

I tried several things:

ipcfg_get_link_active(DEFAULT_ENET_DEVICE)

ipcfg_get_state(DEFAULT_ENET_DEVICE)

prior to initialization ipcfg_get_link_active returns 0

afterwords it returns 1 always.

ipcfg_get_state looked more promising because it returned 0,1,2,3 depending on its state but couldn't tell if I had disconnected.

One of
• IPCFG_STATE_INIT
• IPCFG_STATE_UNBOUND
• IPCFG_STATE_BUSY
• IPCFG_STATE_STATIC_IP
• IPCFG_STATE_DHCP_IP
• IPCFG_STATE_AUTO_IP
• IPCFG_STATE_DHCPAUTO_IP
• IPCFG_STATE_BOOT

Re: How to test if socket connection is still there?

monXii — Mon, 07 May 2012 16:22:23 GMT

same issue here ..

.. some new ideas? =)

Re: How to test if socket connection is still there?

Tgomes — Tue, 08 May 2012 19:51:13 GMT

Hi,

Have you checked the hardware connections? I ask this because I had a problem very similar to this, and the cause was the connection between the connector and the transceiver (DP83640). Two wires were reversed and some resistors in the wrong place.

Best regards.

Re: How to test if socket connection is still there?

monXii — Tue, 22 May 2012 20:48:39 GMT

mh.. can't believe that the wiring is incorrect ..

.. cause ethernet works fine! but only the cable detection ..

i'll try it on the tower ..