[Unity & Rasa Chatbot AI] How to connect to a local host?

Hello everyone,

first of all, I've some limited understanding of networking so please bare with me. I want to implement a Chatbot AI into one of my Unity Projects, I'm using Rasa as it's Open Source and I can use it locally.

I can start with Rasa a Server on my localhost, the server starts up and I can see the a message from Rasa on "http://localhost:5005". That's fine, but how do I connect now with Unity to this server the right way?

I'm using Unity 2019.2 14f1. If I run my Code below, I get for the "error" variable "0", which means everything is good but my Debug Log don't put out "We have connected". After a while the Debug Log just prints "We have been disconnected", which probably means there was a timeout or something went terrible wrong?

Also, this is some additional help if someone by any chance knows a way, if I get the connection how do I receive the string of the Chatbot? And how do I send a string to this Chatbot?

Thanks in advance!

PS: UnityEngine.Networking seems to be outdated which one should I use? Because after the documentation I should use UnityEngine.__Networking__ which don't seem to be exist.

Based on some tutorials, this is my code:

Code (CSharp):

1. using System.Collections;
2. using UnityEngine;
3. using UnityEngine.Networking;
4.  
5. public class NetworkManager : MonoBehaviour
6. {
7.     NetworkClient myClient;
8.     private const string SERVER_IP = "127.0.0.1"; // 127.0.0.1
9.     private const int PORT = 5005;
10.     private const int BYTE_SIZE = 1024;
11.  
12.     private int hostID;
13.     private byte error;
14.     private byte reliableChannel;
15.     private bool isStarted;
16.  
17.     // Start is called before the first frame update
18.     void Start()
19.     {
20.         NetworkTransport.Init();
21.         ConnectionConfig cc = new ConnectionConfig();
22.         reliableChannel = cc.AddChannel(QosType.Reliable);
23.         HostTopology topo = new HostTopology(cc, 1);
24.  
25.         hostID = NetworkTransport.AddHost(topo, 0);
26.         NetworkTransport.Connect(hostID, SERVER_IP, PORT, 0, out error); // error is number!
27.         Debug.Log(error);
28.         isStarted = true;
29.     }
30.  
31.     void Update()
32.     {
33.         UpdateMessagePump();
34.     }
35.  
36.     public void UpdateMessagePump()
37.     {
38.         if (!isStarted)
39.             return;
40.  
41.         int recHostID; // Is this from Web or Standalone?
42.         int connectionID; // Which user is sending me this?
43.         int channelID; // Which lane is he sending that message from?
44.  
45.         byte[] recBuffer = new byte[BYTE_SIZE];
46.         int dataSize;
47.  
48.         NetworkEventType type = NetworkTransport.Receive(out recHostID, out connectionID, out channelID, recBuffer, BYTE_SIZE, out dataSize, out error);
49.         switch (type)
50.         {
51.             case NetworkEventType.Nothing:
52.                 break;
53.             case NetworkEventType.ConnectEvent:
54.                 Debug.Log("We have connected");
55.                 break;
56.             case NetworkEventType.DisconnectEvent:
57.                 Debug.Log("We have been disconnected");
58.                 break;
59.             default:
60.             case NetworkEventType.BroadcastEvent:
61.                 Debug.Log("Broadcast");
62.                 break;
63.             case NetworkEventType.DataEvent:
64.                 Debug.Log("Data");
65.                 break;
66.         }
67.     }
68. }