LiteNetLib - another reliable udp library.

Thank you very much!

 

0.8 beta release
https://github.com/RevenantX/LiteNetLib/releases/tag/v0.8.2-beta

• Added new NetPacketProcessor for easy serializer usage
• Added reliable disconnect with user data
• Added connection requests with user data and OnConnectionRequest on remote side to check incoming data and decide to reject (with reason) or accept incoming peer.
• Added possibility to bind to specific ip address (IPv4 and IPv6)
• Added possibility to recycle incoming data (for low GC consumption)
• Changed logging logic
• Improved connection/disconnection logic
• Improved speed
• Updated .netcore and .netstandard requirements to 2.0
• Tons of fixes and improvements (which I just forgot)

 

Hello sir,

I want to know if the LiteNetLib library allows to connect a client in C#/Unity with an UDP server in C++.

If this is possible, could you please give some indications about the walkthrough.

In any case, thank you, for your work.

 

If you need just connection - you can implement part of library in C++ (not hardest thing). But if you need reliable channel you will need to rewrite almost all library in C++)

 

Thank for your fast reply.

So, if i send asynchronously some UDP packet (with any application or language) on an IP adress and a port given, it's not possible to listen with liteNetLib library without create a connection previously.

is it correct?

Thank you very much.

 

To add some precision.

I try to connect a client created with LiteNetLib, and push some packets from the application "PacketSender", but without result.

I have verified the port but even if i get a response after the call to the "connect" method, i never enter in the "OnNetworkReceive" method after send somepackets.

Again, thank you very much to take time for reply.

 

You can use Unconnected Messages for this. They very simple in structure - first byte = 11 other bytes - user data.
(and call netManager.UnconnectedMessagesEnabled = true)

 

thank you

 

LiteNetLib 0.8.3 stable release
https://github.com/RevenantX/LiteNetLib/releases/tag/v0.8.3
Changelog:
(differences from 0.7.7.3)

• Added new NetPacketProcessor for easy serializer usage
• Added reliable disconnect with user data
• Added connection requests with user data and OnConnectionRequest on remote side to check incoming data and decide to reject (with reason) or accept incoming peer.
• Added possibility to bind to specific ip address (IPv4 and IPv6)
• Added possibility to recycle incoming data (for low GC consumption)
• Added basic time sync things to NetPeer
• Improved and enabled merging for all cases (setting removed) (it always reduces traffic)
• Improved ping logic (more accurate and stable)
• Changed logging logic
• Improved connection/disconnection logic
• Improved speed
• Updated .netcore and .netstandard requirements to 2.0
• Unity3d specific fixes
• Tons of fixes and improvements (which I just forgot)

 

Hi, just wanted to say that I like your networking package, thanks for making it available. The code and examples are clear enough that I was able to write some adapters to get it working with an existing project in a few hours, but there are a lot of pieces of code I don't understand. Is there any in-depth documentation, or tutorials on it's use?

 

@CallMeSpam there is no deep documentation (except XML comments to almost all methods) You can join discord and ask any questions

 

Could I get some help with a simple Peer-to-Peer broadcast setup in Unity? I know that messages are getting sent(verified using a listener console program) but I'm not getting anything from a receiver in Unity.

NetworkClient.cs:

Code (CSharp):

1. using System.Net;
2. using System.Net.Sockets;
3. using LiteNetLib;
4. using Debug = UnityEngine.Debug;
5.  
6. public class NetworkClient : INetEventListener
7. {
8.     public void OnPeerConnected(NetPeer peer)
9.     {
10.         Debug.Log("OnPeerConnected");
11.     }
12.  
13.     public void OnPeerDisconnected(NetPeer peer, DisconnectInfo disconnectInfo)
14.     {
15.         Debug.Log("OnPeerDisconnected");
16.     }
17.  
18.     public void OnNetworkError(IPEndPoint endPoint, SocketError socketError)
19.     {
20.         Debug.Log("OnPeerConnected");
21.     }
22.  
23.     public void OnNetworkReceive(NetPeer peer, NetPacketReader reader, DeliveryMethod deliveryMethod)
24.     {
25.         Debug.Log(reader.GetString(100));
26.     }
27.  
28.     public void OnNetworkReceiveUnconnected(IPEndPoint remoteEndPoint, NetPacketReader reader, UnconnectedMessageType messageType)
29.     {
30.         Debug.Log(reader.GetString(100));
31.     }
32.  
33.     public void OnNetworkLatencyUpdate(NetPeer peer, int latency)
34.     {
35.         Debug.Log("OnNetworkLatencyUpdate");
36.     }
37.  
38.     public void OnConnectionRequest(ConnectionRequest request)
39.     {
40.         Debug.Log("OnConnectionRequest");
41.     }
42. }
43.  

Comms.cs:

Code (CSharp):

1. using UnityEngine;
2.  
3. using System.Net;
4. using System.Text;
5. using LiteNetLib;
6.  
7. public class Comms : MonoBehaviour
8. {
9.     private NetworkClient networkClient;
10.     private NetManager networkManager;
11.     private IPEndPoint ipEndPoint;
12.  
13.     void Start()
14.     {
15.         networkClient = new NetworkClient();
16.         networkManager = new NetManager(networkClient);
17.         networkManager.UnconnectedMessagesEnabled = true;
18.         networkManager.DiscoveryEnabled = true;
19.         networkManager.SendDiscoveryRequest(Encoding.ASCII.GetBytes("SendDiscoveryRequest"), 15000);
20.         ipEndPoint = new IPEndPoint(IPAddress.Broadcast, 15000);
21.  
22.         if(!networkManager.Start(IPAddress.Any, IPAddress.IPv6None, 15000))
23.         {
24.             Debug.Log("Failed to start networkManager");
25.         }
26.     }
27.  
28.     void Update()
29.     {
30.         networkManager.PollEvents();
31.     }
32.  
33.     void OnDestroy()
34.     {
35.         if(networkManager != null)
36.         {
37.             networkManager.Stop();
38.         }
39.     }
40.  
41.     public void Send1()
42.     {
43.         networkManager.SendUnconnectedMessage(Encoding.ASCII.GetBytes("Hello world!"), ipEndPoint);
44.     }
45.  
46.     public void Send2()
47.     {
48.         networkManager.SendUnconnectedMessage(Encoding.ASCII.GetBytes("Hello there too!"), ipEndPoint);
49.     }
50. }

 

To use broadcast - use SendDiscoveryRequest (and enable DiscoveryEnabled on receiving side in NetManager)
And receive it in OnNetworkReceiveUnconnected

 

@Obsurveyor simplified broadcast in master

 

Added both to code in my post(edited to reflect) and still not getting anything.

I'm using 0.8.3, do I need to switch to master?

 

@Obsurveyor it must work on stable version too. (don't switch if you don't need)

 

Well I still don't receive anything after adding the discovery stuff.

 

@Obsurveyor try change firewall settings (it often blocks modern unity in windows by default)

 

Well, I'm sorry about that usually Windows Firewall behaves well for me but changing the rule for the Unity editor did fix it(I don't know why it created it for Domain only, this is a standalone machine). However, I'm not getting my strings, just a blank line in the debug log. Is:

Code (CSharp):

1. networkManager.SendUnconnectedMessage(Encoding.ASCII.GetBytes("Hello world!"), ipEndPoint);

invalid? Should I be using NetDataWriter instead?

 

@Obsurveyor if you read strings with NetDataReader you should write them with NetDataWriter

 

Great, thanks a lot, working now.

 

You need to open the DLL file in DependencyWalker tool and see if it has mangled method names [looking like '@2112@asSHDSJDBH@actual-method-name']. If it does, you need to recompile this DLL with these flags
> `-Wl,--kill-at
or
> `CFLAGS="-O -arch i386" CXXFLAGS="-O -arch i386" LDFLAGS="-arch i386"`
and use Calling Convention either `cdecl` or `stdcall`.
I do not know which one will do the trick.

 

@ivan866 c# dll (assembly) and C++ dll are different things....

 

Hi @RevenantX we are using litenetlib in our unity project, everything works great, we been using this library for like 3 months, but we are having issues to track network errors, im using the NetworkErrorEvent but this never gets called. I tried turning off the internet connection and keep sending messages, i also try using the Network Link Conditioner, with package loss. And i never gets any error event. Im missing something?

 

Hi @RevenantX I really like your library and it works very well!
I have some issues with the NetPacketProcessor, I'm sorry if I ask a question you've already answered before..

What is the purpose of

Code (CSharp):

1. _packetProcessor.[B]SubscribeReusable[/B]<SomeType>(SomeMethod);

If I remove the SubscribeReusable from my client code, the Deserialize process goes wrong for my packets.

Thanks a lot

 

https://github.com/RevenantX/LiteNetLib/wiki/NetPacketProcessor-(NetSerializer)-usage

 

Added documentation at github pages - https://revenantx.github.io/LiteNetLib/index.html

 

RevenantX I was starting to look at moving to version 0.9 and it seems that the NetManager has lost the DiscoveryEnabled property. Is there a document that shows what has been deprecated in 0.9?

Thank you and thank you for this wonderful library

 

RevenantX It looks like DiscoveryEnabled was replaced with BroadcastReceiveEnabled. Is that correct?

 

THANK YOU, this library seriously needed this. 11/10.

 

Yes. It just renamed.

 

Hi, RevenantX.
Will this library work with IL2CPP scripting backend?

 

Hi. Sure It works with IL2CPP

 

@RevenantX Happy New Year to you sir. Over this holiday season I have started to deep dive into the PlayFab universe and I have a question for you if you do not care.

I am working on QoS to their servers and they specify their requirements to do so as the following:

1. Create a UDP socket.
2. Send a single UDP datagram to port 3075 on the QoS server. The message content must start with 2 bytes of 255 (1111 1111 1111 1111).
3. The server will reply with a single datagram, with the message contents having first 2 bytes "flipped" to 0 (0000 0000 0000 0000). The rest of the datagram contents will be copied from the initial ping.
4. Measure the time between sending the UDP message and receiving a response

https://api.playfab.com/docs/tutori...e-qos-beacons-to-measuplayer-latency-to-azure

I am able to retrieve a listing of their QoS servers for each region and now I am just trying to figure out how to ping them using the above criteria and your library. I have it somewhat working with the System.Net.Sockets.UdpClient class, but since I am already using your library for my GameServer code just makes sense to me to stick with your library.

Also I figure you have a much more elegant way to ping multiple servers and handle the receive callbacks.

Thanks in advance and hope you are well and thank you for all that you do for the community.

 

@docseuss just use simple UDP socket , or UDP client. LiteNetLib use internally special protocol that not compatible with this.

 

@RevenantX Thank you for the reply and I guess I will keep going down the road I have been. Happy New Year to you

 

Just a heads up. Using the latest build from GitHub, the individual data fragments are collated into a single NetPacket which has a maximum data size of 65535 (max(ushort)), so the maximum data message size is currently 65535, which includes packet type, and any field information in the NetworkMessage (including binary byte arrays and sizes). I'm working on a prototype, and had to chunk by binary sends into chunks on size 0xF000 (to allow space for a few other fields and packet type info).

Regards,
JPG

 

Are you sure? Because i didn't changed anything. So if you cannot send data more than 65535 bytes this is bug. Can you send example?

 

Hey @RevenantX !

I have been following this project for awhile now, and am finally at a point where I need to decide on a net lib to use. I was just curious on how you feel this holds up against RakNet?

 

Decide on features what you need. Compare and select.

 

Hello request a problem, I send pictures of more than 10 m, converted into bytes writer. PutBytesWithLength () method, which can be one-time send it, I use DeliveryMethod ReliableOrdered

 

Hello, is there a limit to the size of the split package?I have a picture of 10M to send. How do I send it?Thank you very much!

 

https://forum.unity.com/threads/litenetlib-another-reliable-udp-library.414307/#post-3012870

 

LiteNetLib 0.9.2.2 released
https://github.com/RevenantX/LiteNetLib/releases/tag/v0.9.2.2
(changes since 0.8.3)

• Added multiple channels for Reliable and Sequenced methods (64 for each type of message) (configured by NetManager.ChannelsCount)
• Added IPv6Enabled, StatsEnabled to NetManager - to allow enable/disable this features without recompiling and defines (IPV6_ENABLED, STATS_ENABLED)
• Added packet layers that allows encrypt data or check checksums (Crc32C SSE optimized and XOR already included)
• Added feature that allows trigger callback on reliable packets when packet delivered (#248)
• Added RejectForce to reject connection requests without "reliable disconnect" (very handy in DDOS case)
• Fixed some disconnection cases
• Fixed ReliableSequenced channel
• SendDiscoveryRequest renamed to SendBroadcast
• More informative DisconnectReason in DisconnectInfo
• Improved connection logic and speed
• Better packets recycling (less pressure on GC)
• Added DocFX documentation (https://revenantx.github.io/LiteNetLib/api/index.html)
• Improved and optimized NetSerializer (~3x faster than previous version)
• Minimum .netcore version increased to 2.1
• Fixes for recent Unity3d (2018/2019)
• Overall optimizations and stability improvements

 

Hey Revenant! I'm loving this lib. Really great work! I don't know if I'm doing something wrong, but with the version 0.9.2.2 I get disconnect in the NatPuncherSample

Code (CSharp):

1. === HolePunch Test ===
2. [MAIN] NTP time test offset: 00:00:01.5527040
3. Press ESC to quit
4. Wait peer created. i(192.168.0.11:52101) e([::1]:52101)
5. Wait peer found, sending introduction...
6. host - i(192.168.0.11:52101) e([::1]:52101)
7. client - i(192.168.0.11:52102) e([::1]:52102)
8. Success C1. Connecting to C2: 192.168.0.11:52102, connection created: True
9. Success C1. Connecting to C2: [::1]:52102, connection created: True
10. Success C2. Connecting to C1: 192.168.0.11:52101, connection created: True
11. Success C2. Connecting to C1: [::1]:52101, connection created: False
12. PeerConnected: [::1]:52101
13. PeerConnected: [::1]:52102
14. PeerDisconnected: ConnectionFailed
15. PeerDisconnected: ConnectionFailed

Can you maybe confirm that and do you have a suggestion how to solve it?

 

@scheichs there is one bug with simultaneous connection from both sides. But here another thing. Peers have 2 IPs (IPv4 and IPv6) so you connected by IPv6 and "failed" by IPv4. You can disable one of protocols to get more predictable results

 

Thanks for the quick response! Do you have another donation mehtod than bountysource? Maybe direct paypal donate? Otherwise I'm going to register bountysource...

 

@scheichs Thanks. But now i have only bountysource option :\

 

sure no prob. Will donate tomorrow!

 

Hmm. Tried to sign-up at bountysource (tried 2 different emails) but email-verification doesn't finish for some reason (keeps in "verifying"-state).