K66 lwip disconnection bug

[mpazzi]

Hello,

I'm using MCUXpresso IDE 10.2 and SDK 2.4.1 with MK66FX1M0.

The problem is with ethernet cable, if I disconnect it and then reconnect it the comunication is not resumed any way until I reset the microntroller.

Is there any solutions to fix this bug ? ...possibly without change SDK 2.4.1 to SDK 2.6 and conseguently the IDE ...

Thank a lot for any suggestion and help.

Marco

[FelipeGarcia]

Hi Marco,

You could try to do something as follows to detect when the ethernet cable has been disconnected:

PHY_GetLinkStatus(ethernetif->base, BOARD_ENET0_PHY_ADDRESS, &link);
 
if(false == link)
{
    PRINTF("LINK DOWN\r\n");
    netif_set_down(netif);
}
else
{
    PRINTF("LINK UP\r\n");
    netif_set_up(netif);
}‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Hope it helps!

 
Have a great day,
Felipe

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[mpazzi]

Hello Felipe,

thanks for your replay.

But where do I insert the code you gives to me ?

down the main code for handle communication:

If the connection is established fine the cycle remain in the

 and if some data is coming goes through

if I close connection excute 

But if I disconnect the cable the code excuted

because no data will come.

If the cable is connected or if I disconnect it the running remain in this part:

called from this:

Thanks for your help.

Regards

[FelipeGarcia]

Hi Marco,

I am sorry for the late reply.

I used the tcp_echo_bm example from the SDK and added those lines in ethernetif.c file. Right before to read the frame.

I hope this is helpful.

Best regards,
Felipe

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- We are following threads for 7 weeks after the last post, later replies are ignored
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[mpazzi]

Hi Felipe,

I've just tryed your solution, I'm using freeRTOS.

When the cable is connected I see "LINK UP", if I disconnect the cable no "LINK UP" or "LINK DOWN" appears, but when I re-connect the cable I see LINK DOWN and after LINK UP but the comunication is not working any more until the reset.

Any idea?

Thanks a lot for your support.

Marco

[FelipeGarcia]

Hi Marco,

Did you try the above with the example provided in the SDK? I recommend you to try it first in the example so you can then change to your application.

Best regards,

Felipe

[mpazzi]

Hi Felipe,

I have tryed with TWRK65 demo board and I see that with one PC (maybe windows XP) the disconnecting and reconnecting of cable work fine, if I try with one PC (windows 10) the disconnecting and reconnecting of cable do not work.

Not working I mean the cable is connected and I use echotool command and I disconnect and reconnect the cable while the server is responding, the process in PC goes in timeout and after I can't have communication anymore.

Looking in code " tcpecho_thread(void *arg) " -> netconn_recv_data(struct netconn *conn, void **new_buf) -> u32_t sys_arch_mbox_fetch( sys_mbox_t *pxMailBox, void **ppvBuffer, u32_t ulTimeOut ) the last function is called (by sys_timeouts_mbox_fetch(sys_mbox_t *mbox, void **msg) ) with ulTimeOut with zero value that means wait forever and never return for close connection.

I hope to be clear enough.

Best Regards

Marco

[FelipeGarcia]

Hi Marco,

I tried the tcpecho_bm example with TWR-K65F board on my side and did the following.

- Changed configIP_ADDR in the example code to my PC IP address.

- I sent the following command in echotool:

echotool IPADDRESS /p tcp /r 7 /d hello

And received:

Hostname IPADDRESS resolved as IPADDRESS

Reply from IPADDRESS:7, time 0 ms OK

Reply from IPADDRESS:7, time 0 ms OK

Reply from IPADDRESS:7, time 0 ms OK

Reply from IPADDRESS:7, time 0 ms OK

Reply from IPADDRESS:7, time 0 ms OK

Statistics: Received=5, Corrupted=0

Then I disconnected the cable and sent the command again and I received the following.

Host unreachable

Statistics: Received=0, Corrupted=0

Finally I reconnected the cable and sent the same command and received the same response as the beginning.

Hostname IPADDRESS resolved as IPADDRESS

Reply from IPADDRESS:7, time 0 ms OK

Reply from IPADDRESS:7, time 0 ms OK

Reply from IPADDRESS:7, time 0 ms OK

Reply from IPADDRESS:7, time 0 ms OK

Reply from IPADDRESS:7, time 0 ms OK

Statistics: Received=5, Corrupted=0

Could you please confirm you experience this behaviour on your side?

Best regards,

Felipe

[mpazzi]

Hi Felipe,

thanks for your reply.

On my board I use RTOS, so I used TWRK65 with RTOS example and I have problem if I disconnect the cable, specially with PC as windows 10. The ping command work correctly in any situation.

For resolve the issue I have modify as down:

So I have introduced a timeout of 5sec on static err_t
netconn_recv_data(struct netconn *conn, void **new_buf), if I do not have communication for more then 5 sec the netconn is closed.

What do think about this solution ?

Thanks

Marco

[FelipeGarcia]

Hi Marco,

That looks correct from my side.

Regards,

Felipe

[mpazzi]

Hi Felipe,

thanks for precious help. I have one more question.

I have used the tcp-echo example to implement MODBUS over TCP protocol, and with the modified above I can connect to one PC or to another PC by disconecting cable or using an Hub.

But now I should handle 2 connection at the same time , so two PC should connected through a hub to my board.

How can I do this functionality ?

Thank for your support

Regards

Marco

[FelipeGarcia]

Hi Marco,

The LWIP stack supports multiple TCP connection but it will depend on the memory you have available.

In lwipopts.h file the macro MEMP_NUM_TCP_PCB defines the number of simultaneously active TCP.

To create a new connection you should use netconn_new as in tcpecho_thread.

Best regards,

Felipe

[mpazzi]

Hi Felipe,

thanks a lot for your support.

The macro MEMP_NUM_TCP_PCB is defined at 10 connection, so is enough.

I'm not very experienced with TCP and to get a result in less time, do you have an example I can rely on?

Best Regards

Marco

[FelipeGarcia]

Hi Marco,

Unfortunately, we do not have such an example for that specific application.

Sorry for the inconvenience this may cause you.

Best regards,

Felipe

[mpazzi]

Hi Felipe,

thanks anyway.

Best regards

Marco