If a ping request is successfully sent then the sequence number sent in the ping message is returned to allow the application writer to match ping requests transmitted with ping replies received. See the example below.
If a ping request could not be sent then pdFAIL is returned.
This example defines two functions. vSendPing() transmits 8 bytes to a remote IP address. vApplicationPingReplyHook() is the standard FreeRTOS+TCP ping reply callback function. vApplicationPingReplyHook() receives the ping reply, then sends the received sequence number to vSendPing() where it is compared to the sequence number from the ping request.
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