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AM2434: Enet Lwip Socket Example: cannot print "Message from host: Greetings from Texas Instruments!" to terminal.

Weijian Tang
Prodigy 151 points
Part Number: AM2434

Dear TI experts,

  I am going through the AM243x MCU+ SDK 09.01.00, in Example and Demos ->Ethernet And Networking->Enet Lwip Socket Example , I cannot complete "Enet Lwip Socket Example".

  I am using the AM243x MCU+ SDK 09.01.00 and ncat tool in Windows environment.

1. Sample output for CPSW example.


2. Static IP mode.


3. Execute "ncat -l -k -p 8888"  command.


4. The results of running "Enet Lwip Socket Example" in my computer.


5.  In the app_socket.c -> AppSocket_simpleClient(void* pArg) , I found that FD_ISSET(sock, &readset) has a value of 0, which prevents access to lwip_read(). I tried to solve this problem, but I didn't find the right solution. I don't know if there is some other reason why the data is not being read from host correctly. 


6. How can I solve this problem?

Regards,

Weijian Tang

  • 0
    TI__Genius 12571 points

    Hi Weijan Tang,

    I'm looking into it and will get back with an update. Meanwhile can you please let me know if the IP address of your PC running the NCAT tool was the same as the one being entered in the application (when prompted for server address)?

    Regards,

    Shaunak

  • 0 in reply to Shaunak Deshpande
    Prodigy 151 points

    Hi Shaunak,

    1. I checked the code and made sure it was the same.

    Shaunak Deshpande said:
    if the IP address of your PC running the NCAT tool was the same as the one being entered in the application

    2.  IPV4 address(PC) is as follows 

    3. Client address is as follows 

    Regards,

    Weijian Tang

  • +1 in reply to Weijian Tang
    TI__Genius 12571 points

    Hi Weijian Tang,

    Can you please help me understand what do you refer to by "not able to complete the example". Is it the "Message from Host not received" you are pointing to

    1. Run NCAT TCP Server with the command "ncat -e /bin/cat -kv -l 8888" (as mentioned in the SDK documentation)

    This will give you the Response from TCP Server in your application (show the message received from host server as displayed in the SDK documentation sample output).

    2. Run NCAT TCP Server with the command "ncat -l -k -p 8888" (as mentioned in your steps above)

    In this case I am able to reproduce the same output as you, i.e. no message received from host.

    Can you run the 1st command and let me know if you still face the issue? Or if I it is some other issue you are referring to, please let me know the same.

    Regards,

    Shaunak

  • 0 in reply to Shaunak Deshpande
    Prodigy 151 points

    Hi Shaunak,

    Yes, "Message from Host not received" is the problem I have now.

    Shaunak Deshpande said:
    Is it the "Message from Host not received" you are pointing to

    When I run NCAT TCP Server with the command "ncat -e /bin/cat -kv -l 8888"  in  Windows10 , I get the following error:


    Is the command "ncat -e /bin/cat -kv -l 8888" not applicable to Windows10?

    Regards,

    Weijian Tang

  • +1 in reply to Weijian Tang
    TI__Genius 12571 points

    Hi Weijian Tang,

    Weijian Tang said:
    Is the command "ncat -e /bin/cat -kv -l 8888" not applicable to Windows10?

    1. I am able to test it on windows, 

    2. In case you have access to a Linux machine, you can try that as well.

    Regards,

    Shaunak