code: func (a *vppClient) SendMsg(context uint32, data []byte) error {
  	rc := C.govpp_send(C.uint32_t(context), unsafe.Pointer(&data[0]), C.size_t(len(data)))
  	if rc != 0 {
  		return fmt.Errorf("unable to send the message (rc=%v)", rc)
  	}
  	return nil
  }
docs: // SendMsg sends a binary-encoded message to VPP.