static bool mock_init(struct mg_tcpip_if *ifp) {
  (void) ifp;
  return true;
}

static size_t mock_tx(const void *buf, size_t len, struct mg_tcpip_if *ifp) {
  (void) buf, (void) len, (void) ifp;
  return len;
}

static size_t mock_rx(void *buf, size_t len, struct mg_tcpip_if *ifp) {
  (void) buf, (void) len, (void) ifp;
  return 0;
}

static bool mock_up(struct mg_tcpip_if *ifp) {
  (void) ifp;
  return true;
}

struct mg_tcpip_driver mg_tcpip_driver_mock = {mock_init, mock_tx, mock_rx, mock_up};