Client/Assets/Scenes/Test.unity

@@ -303,6 +303,50 @@ Transform:
   - {fileID: 9462743}
   m_Father: {fileID: 0}
   m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
+--- !u!1 &912467177
+GameObject:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  serializedVersion: 6
+  m_Component:
+  - component: {fileID: 912467178}
+  - component: {fileID: 912467179}
+  m_Layer: 0
+  m_Name: NetworkConnectionTest
+  m_TagString: Untagged
+  m_Icon: {fileID: 0}
+  m_NavMeshLayer: 0
+  m_StaticEditorFlags: 0
+  m_IsActive: 1
+--- !u!4 &912467178
+Transform:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 912467177}
+  serializedVersion: 2
+  m_LocalRotation: {x: 0, y: 0, z: 0, w: 1}
+  m_LocalPosition: {x: 0, y: 0, z: 0}
+  m_LocalScale: {x: 1, y: 1, z: 1}
+  m_ConstrainProportionsScale: 0
+  m_Children: []
+  m_Father: {fileID: 0}
+  m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
+--- !u!114 &912467179
+MonoBehaviour:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 912467177}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: 289a7efc822fe7347adfbf218522e8a2, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: 
 --- !u!1 &1057087086
 GameObject:
   m_ObjectHideFlags: 0
@@ -601,3 +645,4 @@ SceneRoots:
   - {fileID: 1371068282}
   - {fileID: 1057087090}
   - {fileID: 613797070}
+  - {fileID: 912467178}

Client/Assets/Scripts/Test/NetworkConnectionTest.cs

@@ -0,0 +1,26 @@
+using System.Threading.Tasks;
+using Network;
+using UnityEngine;
+
+namespace Test
+{
+    public class NetworkConnectionTest : MonoBehaviour
+    {
+        private async void Start()
+        {
+            await BasicTest();
+        }
+
+        private static async Task BasicTest()
+        {
+            var result = await UnityTcpClient.Instance.Connect("127.0.0.1", 12345);
+            if (result) Debug.Log("Connected to server!");
+            else Debug.LogError("Failed to connect to server!");
+
+            string buffer = null;
+            while (buffer is null) buffer = await UnityTcpClient.Instance.Receive();
+
+            Debug.Log($"Received contents: {buffer}");
+        }
+    }
+}

Client/Assets/Scripts/Test/NetworkConnectionTest.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 289a7efc822fe7347adfbf218522e8a2

Server/src/network_service/tcp_server.rs

@@ -1,4 +1,4 @@
-use tokio::io::AsyncWriteExt;
+use tokio::io::{ErrorKind, Interest};
 use tokio::net::{TcpListener, TcpStream};
 
 pub(crate) struct TcpServer;
@@ -20,10 +20,44 @@ impl TcpServer {
         }
     }
 
-    async fn process(mut socket: TcpStream) {
+    async fn process(socket: TcpStream) {
-        socket
+        loop {
-            .write_all("Hello from server written in Rust!".as_bytes())
+            match socket.ready(Interest::READABLE | Interest::WRITABLE).await {
-            .await
+                Ok(ready) => {
-            .unwrap();
+                    if ready.is_readable() {
+                        let mut buffer = Vec::with_capacity(1024);
+                        match socket.try_read_buf(&mut buffer) {
+                            // We need to write to client after reading from that,
+                            // so we use `continue` here instead if `break`.
+                            Ok(_) => {
+                                log::info!("Received contents");
+
+                                // TODO: Start dispatching messages here.
+
+                                continue;
+                            }
+                            Err(e) if e.kind() == ErrorKind::WouldBlock => continue,
+                            Err(e) => {
+                                log::error!("Failed to read from TCP client socket: {e}");
+
+                                break;
+                            }
+                        }
+                    }
+                    if ready.is_writable() {
+                        match socket.try_write(b"Hello from server written in Rust!") {
+                            Ok(_) => break,
+                            Err(e) if e.kind() == ErrorKind::WouldBlock => continue,
+                            Err(e) => {
+                                log::error!("Failed to write to TCP client socket: {e}");
+
+                                break;
+                            }
+                        }
+                    }
+                }
+                Err(e) => log::error!("Failed to wait for any states: {e}"),
+            }
+        }
     }
 }