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##

# PPP_ECHO_CALLBACK Function

## C

    typedef void (*PPP_ECHO_CALLBACK)(const struct _tag_PPPP_ECHO_REQUEST* pEchoReq, PPP_REQUEST_HANDLE pppHandle, PPP_ECHO_RESULT result, const void* param);

## Description

This callback function will be called when the PPP echo operation is completed

## Remarks

None

## Parameters

- pEchoReq - pointer to a PPP_ECHO_REQUEST data structure describing the request

  see the PPP_ECHO_REQUEST data structure description

- pppHandle - the handle returned by PPP_EchoRequest

- result - the echo request result,

  when result == PPP_ECHO_REQUEST_RES_OK, the pEchoReq->pData points to the received data

- param - user defined parameter to be called in the callback