Limiting Ethernet to one inbound connection

Using Arduino Networking, Protocols, and Devices
13

This is a version which doesn't always return the same connection if there are multiple open connections:

EthernetClient EthernetServer::available()
{
  accept();

  int rand = micros() % MAX_SOCK_NUM;

  for (int s = 0; s < MAX_SOCK_NUM; s++) {
    int sock = (s + rand) % MAX_SOCK_NUM;
    EthernetClient client(sock);
    if (EthernetClass::_server_port[sock] == _port &&
        (client.status() == SnSR::ESTABLISHED ||
         client.status() == SnSR::CLOSE_WAIT)) {
      if (client.available()) {
        return client;
      }
    }
  }

  return EthernetClient(MAX_SOCK_NUM);
}

EthernetClient EthernetServer::connected()
{
  accept();
  int rand = micros() % MAX_SOCK_NUM;

  for (int s = 0; s < MAX_SOCK_NUM; s++) {
    int sock = (s + rand) % MAX_SOCK_NUM;
    EthernetClient client(sock);
    if (EthernetClass::_server_port[sock] == _port &&
         (client.status() == SnSR::ESTABLISHED ||
         (client.status() == SnSR::CLOSE_WAIT && client.available()))) {
      return client;
    }
  }

  return EthernetClient(MAX_SOCK_NUM);
}

It's not completely random but it's better than using always the same order to look for the next socket to handle.