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Original question:

EK-TM4C1294XL: Ethernet Communication Between Launchpad and PC

EK-TM4C1294XL: Enet_io

Cesar Castellanos
Prodigy 90 points
Part Number: EK-TM4C1294XL
Other Parts Discussed in Thread: CC3100

I have loaded on EK-TM4c1294XL connected  launchpad the enet_io example and it runs ok only if I use browsers within the subnet of my house, if i try to access the web page from a browser outside this home net (subnet), the web page does not load.  the main modem which supplies the internet wifi signal to my house is ARRIS  TG862, and I checked with my Internet provider (CLARO) if there was a modem configuration that could be blocking the connection, but they have tested and tried to acces the web page with the IP address that enet_io provides by means of  the terminal, and they could not either acess it.  

I have tried with TM4C1294 and CC3100 booster pack to obtain web based io, using ek-tm4c1294xl-boost-cc3100 uvision project  and no connection or access to internet is obtained, only there is communication between my celular and the board (TM4C1294 +boost cc3100). Will these two behaviors be related?. Please Help.

  • 0
    TI__Guru**** 191296 points

    Hi,

      If two computers (in your case the webserver running on your board and the browser client running on your PC) are going to talk then they must belong to the same subnet. If they are not on the same subnet then there needs to exist a router between both computers that can forward traffic between subnets. 

      As far as the CC3100, we don't have any expertise with the Wifi in this forum. Please create a new thread to the Wifi forum https://e2e.ti.com/support/wireless-connectivity/wifi/f/968 so the experts there can assist you.

  • 0 in reply to Charles Tsai
    Prodigy 90 points

    Thanks for your answer Charles Tsai, but if I have understood well you propose to include a router between the board and the other computer ( my laptop or my celular ?), but I think that has been done already, because a far away laptop in another town was used to access the IP provided by the board ( 192.168.0.4, displayed through the terminal in my laptop, which was connected to the home net wirelessly), and no access to the board's page is obtained. In both places an ARRIS TG862 was involved as a modem (and a Router ??). The same result happened with my celular when no WiFi is used for internet connection. If these connections are not whatyou propose, could you be more specific about the  new router connection?, would it be for example from ethernet ports of ARRIS TG862 to the new Router, and the board connected to the ethernet port of the new router??. Thanks again, César Castellanos

  • 0 in reply to Cesar Castellanos
    TI__Guru**** 191296 points

    Hi,

      Are you using static IP address or DHCP?

      Please note that the example is meant to only run on your private LAN network, not through internet. 

  • 0 in reply to Charles Tsai
    Prodigy 90 points

    Hi Charles: Thanks again, I am using static IP address. Would DHCP provide Internet Access used within enet_io?, if so, is there a  DHCP "patch" Texas Instruments could provide me?.   Best Regards, César Castellanos 

  • 0 in reply to Cesar Castellanos
    TI__Guru**** 191296 points

    Hi,

      If you use static address, have you tried to use the subnet mask to include your PC subnet? See below for example for a subnet mask of 255.255.0.0

    lwIPInit(g_ui32SysClock, pui8MACArray,

                your_static_IP_address,

               (255 << 24) | (255 << 16) | (0 << 8) | 0,

               (255 << 24) | (255 << 16) | (0 << 8) | 0,

               IPADDR_USE_STATIC);