Note: this hook needs to be defined only when
ipconfigPROCESS_CUSTOM_ETHERNET_FRAMES is set to 1 in the FreeRTOSIPConfig.h file.
eFrameProcessingResult_t eApplicationProcessCustomFrameHook( NetworkBufferDescriptor_t * const pxNetworkBuffer );
eApplicationProcessCustomFrameHook is an application defined hook (or *callback*) function that is called by the FreeRTOS+TCP stack when the stack receives a frame which is not handled by the stack which is anything except an ARP frame or an IP packet.
Callback functions are implemented by the application writer, but called by the TCP/IP stack. The prototype of the callback function
must exactly match the prototype above (including the function name). The code in an application hook should not call FreeRTOS+TCP API's
that are blocking. That could easily lead to a dead-lock.
When an application hook executes, it borrows the task priority and the stack of the IP-task. Therefore, we recommend that you keep application hooks short--it may want to wakeup some application task which will do further processing.
The network buffer containing the unsupported frame.
The returned value must be of the type
eFrameProcessingResult_t. If the frame is to be released then eReleaseBuffer
should be returned and the network stack will take care of clean-up. If anything else is returned, then the user/application must
release the network buffer by calling
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