httpget example questions (TM4C1294 - TIRTOS)

S D said:

Should I expect netIPAddrHook to be called when I unplug and re-plug the physical Ethernet connection?

No, the netIPAddrHook is not called when the link is up or down. This is called when an IP is added or removed. I was answering to your earlier question:

S D said:

 expect the IP address should change and that should call the netIPAddrHook function?

S D said:

Assuming the answer is no, is the recommended practice of Ethernet link detection to use the NETCTRL functions?

I have read the NDK user guide and reference guide. I keep going back to them and the examples that I can find. I can't find the answers to these questions though.

Please refer to the NDK User Guide Section 4.2.4 - you can use LINKUP/LINKDOWN signalling. When configured, the NDK stack will call a user defined callback function and pass an argument informing the callback if the link went up or down. You can use this signalling to disable DHCP when link is down and re-enable when the link is up. This functionality for TivaC devices is supported in TI-RTOS 2.16.00.08 release.

Here is an example for DHCP disable/enable (Note: this is an old code just for reference):

//
// DHCP_reset()
//
// Code to reset DHCP client by removing it from the active config,
// and then reinstalling it.
//
// Called with:
// IfIdx    set to the interface (1-n) that is using DHCP.
// fOwnTask set when called on a new task thread (via TaskCreate()).
//
void DHCP_reset( uint IfIdx, uint fOwnTask )
{
    CI_SERVICE_DHCPC dhcpc;
    HANDLE h;
    int    rc,tmp;
    uint   idx;

    // If we were called from a newly created task thread, allow
    // the entity that created us to complete
    if( fOwnTask )
        TaskSleep(500);

    // Find DHCP on the supplied interface
    for(idx=1; ; idx++)
    {
        // Find a DHCP entry
        rc = CfgGetEntry( 0, CFGTAG_SERVICE, CFGITEM_SERVICE_DHCPCLIENT,
                          idx, &h );
        if( rc != 1 )
            goto RESET_EXIT;

        // Get DHCP entry data
        tmp = sizeof(dhcpc);
        rc = CfgEntryGetData( h, &tmp, (UINT8 *)&dhcpc );

        // If not the right entry, continue
        if( (rc<=0) || dhcpc.cisargs.IfIdx != IfIdx )
        {
            CfgEntryDeRef(h);
            h = 0;
            continue;
       }

        // This is the entry we want!

        // Remove the current DHCP service
        CfgRemoveEntry( 0, h );

        // Specify DHCP Service on specified IF
        bzero( &dhcpc, sizeof(dhcpc) );
        dhcpc.cisargs.Mode   = CIS_FLG_IFIDXVALID;
        dhcpc.cisargs.IfIdx  = IfIdx;
        dhcpc.cisargs.pCbSrv = &ServiceReport;
        CfgAddEntry( 0, CFGTAG_SERVICE, CFGITEM_SERVICE_DHCPCLIENT, 0,
                     sizeof(dhcpc), (UINT8 *)&dhcpc, 0 );
        break;
    }

RESET_EXIT:
    // If we are a function, return, otherwise, call TaskExit()
    if( fOwnTask )
        TaskExit();
}

Hope this answers your questions better.

Vikram