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Discover WiFi - DNS Resolution

andyw999

In sn8200_core.h there is SNIC_RESOLVE_NAME_REQ which is referred to in page 72 of the SN8200 SNIC Serial Interface Specification.pdf

 

(Optional) SNIC_RESOLVE_NAME_REQ to resolve a host name to IP address

 

If you try to do a query with it then handleRxSNIC get returned 0x8A which is not a member of SNIC_subcmd_id_e in sn8200_core.h, in fact it has been deliberately left out :-

 

    SNIC_SEND_RSP = 0x82,

    SNIC_CLOSE_SOCKET_RSP,

    SNIC_GET_DHCP_INFO_RSP = 0x89,

    SNIC_IP_CONFIG_RSP = 0x8B,

 

Does anybody know how to make this work and if the SN8200 UART firmware even supports it?

 

I have asked Murata but do not know if I will get a response...

 

Edit - just had a response from Murata and the version 2.3 of the SNIC serial interface specification.pdf is a lot more up to date.

 

Thanks

 

Andy.

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    Looking at the SNIC v2.3...

     

    In sn8200_core.h add in SNIC_subcmd_id_e :-

     

    SNIC_GET_DNS_INFO_RSP = 0x8A,

     

    In sn8200_api.c handleRxSNIC add :-

     

    case SNIC_GET_DNS_INFO_RSP:

    {

         if (SNIC_SUCCESS == buf[2])

         {

              printf("IP from DNS %i.%i.%i.%i \n\r", buf[3],buf[4],buf[5],buf[6]);

         }

         else

         {

              printf("IP not availabler\n\r");

         }

    }

    break;

     

    To get DNS info :-

    #define HOST "somesite.com"

     

    int getdns(int8u seq)

    {

        int8u buf[50];

        int16u len = sizeof(HOST);

        int16u mybufsize;

     

        buf[0] = SNIC_RESOLVE_NAME_REQ;

        buf[1] = seq;

        buf[2] = 0x00;

        buf[3] = len;

        memcpy(buf+4, HOST, len);

     

        serial_transmit(CMD_ID_SNIC, buf, 4+len, ACK_NOT_REQUIRED);

     

        return 0;

    }

     

    And it works!

     

    Andy.

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  • 0

    Looking at the SNIC v2.3...

     

    In sn8200_core.h add in SNIC_subcmd_id_e :-

     

    SNIC_GET_DNS_INFO_RSP = 0x8A,

     

    In sn8200_api.c handleRxSNIC add :-

     

    case SNIC_GET_DNS_INFO_RSP:

    {

         if (SNIC_SUCCESS == buf[2])

         {

              printf("IP from DNS %i.%i.%i.%i \n\r", buf[3],buf[4],buf[5],buf[6]);

         }

         else

         {

              printf("IP not availabler\n\r");

         }

    }

    break;

     

    To get DNS info :-

    #define HOST "somesite.com"

     

    int getdns(int8u seq)

    {

        int8u buf[50];

        int16u len = sizeof(HOST);

        int16u mybufsize;

     

        buf[0] = SNIC_RESOLVE_NAME_REQ;

        buf[1] = seq;

        buf[2] = 0x00;

        buf[3] = len;

        memcpy(buf+4, HOST, len);

     

        serial_transmit(CMD_ID_SNIC, buf, 4+len, ACK_NOT_REQUIRED);

     

        return 0;

    }

     

    And it works!

     

    Andy.

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