Function otBorderAgentEphemeralKeySetCallback 

pub unsafe extern "C" fn otBorderAgentEphemeralKeySetCallback(
    aInstance: *mut otInstance,
    aCallback: otBorderAgentEphemeralKeyCallback,
    aContext: *mut c_void,
)

Sets the callback function to notify state changes of Border Agent’s Ephemeral Key Manager.

Requires OPENTHREAD_CONFIG_BORDER_AGENT_EPHEMERAL_KEY_ENABLE.

A subsequent call to this function will replace any previously set callback.

@param[in] aInstance The OpenThread instance. @param[in] aCallback The callback function pointer. @param[in] aContext The arbitrary context to use with callback.