Switching static IP to DHCP in run time with LWIP FREERTOS

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FreeRTOS+TCP offers this flexibility “at runtime” as follows: the DHCP driver can call a user-defined function xApplicationDHCPHook(), in which the application may decide to return either of:

    eDHCPContinue,      /**< Continue the DHCP process */
    eDHCPUseDefaults,   /**< Stop DHCP and use the static defaults. */
    eDHCPStopNoChanges, /**< Stop DHCP and continue with current settings. */

The application hook is only called if ipconfigUSE_DHCP_HOOK is defined as 1.

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