NetworkTransport.Connect

Parameters

Returns

int A unique connection identifier on success (otherwise zero).

Description

Tries to establish a connection to another peer.

The error parameter will return a non-zero value if an error occurs, this value can be cast to a NetworkError for more information.

Networking.NetworkTransport.Connect can still fail despite returning a non-zero connection id, so make sure to poll Networking.NetworkTransport.Receive or Networking.NetworkTransport.ReceiveFromHost to listen for events. If everything is OK a NetworkEventType.ConnectEvent will be returned.

using UnityEngine;
using UnityEngine.Networking;

public class ConnectExample : MonoBehaviour
{
    int connectionId;
    int channelId;
    int hostId;

    void Start()
    {
        // Init Transport using default values.
        NetworkTransport.Init();

        // Create a connection config and add a Channel.
        ConnectionConfig config = new ConnectionConfig();
        channelId = config.AddChannel(QosType.Reliable);

        // Create a topology based on the connection config.
        HostTopology topology = new HostTopology(config, 10);

        // Create a host based on the topology we just created, and bind the socket to port 12345.
        hostId = NetworkTransport.AddHost(topology, 12345);

        // Connect to the host with IP 10.0.0.42 and port 54321
        byte error;
        connectionId = NetworkTransport.Connect(hostId, "10.0.0.42", 54321, 0, out error);
    }

    void Update()
    {
        int outHostId;
        int outConnectionId;
        int outChannelId;
        byte[] buffer = new byte[1024];
        int bufferSize = 1024;
        int receiveSize;
        byte error;

        NetworkEventType evnt = NetworkTransport.Receive(out outHostId, out outConnectionId, out outChannelId, buffer, bufferSize, out receiveSize, out error);
        switch (evnt)
        {
            case NetworkEventType.ConnectEvent:
                if (outHostId == hostId &&
                    outConnectionId == connectionId &&
                    (NetworkError)error == NetworkError.Ok)
                {
                    Debug.Log("Connected");
                }
                break;
            case NetworkEventType.DisconnectEvent:
                if (outHostId == hostId &&
                    outConnectionId == connectionId)
                {
                    Debug.Log("Connected, error:" + error.ToString());
                }
                break;
        }
    }
}