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site/content/entry/ldn-is-here/index.md

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+date = "2022-09-03T18:00:00+05:30"
+title = "New Feature Release - Local Wireless Multiplayer"
+author = "CaptV0rt3x"
+forum = 622491
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+
+Hey there, yuz-ers!
+The MOST awaited feature of yuzu, Local Wireless Multiplayer, is finally here!
+So what are you waiting for?
+Time to grab your friends and jump right in!
+
+<!--more-->
+
+## What is this?
+
+The Nintendo Switch console supports various multiplayer options. 
+Among these, the following options are useful when you want to play multiplayer with other Switch consoles.
+{{< imgs "./multi.png" >}}
+
+The image below, shows the key difference between these three.
+{{< imgs "./Switch_Conn.png" >}}
+
+<article class="message has-text-weight-semibold"><div class="message-body"><p>
+The Switch's HorizonOS uses the LDN service for the Local Wireless multiplayer. <br>
+That's the reason this can also be referred to as LDN multiplayer.
+</p></div></article>
+
+Thanks to the efforts of our developers [FearlessTobi](https://github.com/FearlessTobi) and [german77](https://github.com/german77), yuzu now has support for Local Wireless multiplayer.
+Special thanks to [spacemeowx2](https://github.com/spacemeowx2/) and [all the contributors](https://github.com/spacemeowx2/ldn_mitm/graphs/contributors) of the [ldn_mitm](https://github.com/spacemeowx2/ldn_mitm) project.
+Without their extensive reverse-engineering of the `LDN` service and the gracious [license exemption](https://github.com/spacemeowx2/ldn_mitm#licensing) for yuzu, this would not have been possible.
+
+
+## Where can you get it?
+
+{{< imgs "./where-is-it.png" >}}
+
+The LDN multiplayer feature is now available on the latest version of the Early-Access builds.
+We will work on polishing this release and make this available on the Mainline builds soon.
+
+<article class="message has-text-weight-semibold"><div class="message-body"><p>
+If you're using the yuzu installer, you'll automatically be updated to the latest build. <br>	
+If you're not using the yuzu installer, please download it from our <a href= https://yuzu-emu.org/downloads/>downloads</a> page. <br>
+We highly recommend using our installer to always stay up-to-date on both Mainline and Early-Access builds.
+</p></div></article>
+
+## Local Wireless (LDN) Multiplayer
+
+yuzu's Local Wireless multiplayer (LDN) differs a little bit when compared to the Nintendo Switch.
+The Switch console uses the `LDN` service to scan for other Switch consoles using Wi-Fi and connects all players.
+Here, one player would act as the `host` and all others would connect to the host.
+
+yuzu, on the other hand, uses virtual rooms to allow players to create and join game lobbies within the room.
+Since this emulates the Switch's ability to do local wireless multiplayer, it doesn’t rely on Nintendo’s servers and does not require a Nintendo Network ID. 
+While on a real Switch you’d be limited to the people in your immediate vicinity, yuzu boasts a complex server/client infrastructure that forwards a game’s wireless communication across the internet.
+
+In order to get together with other players, you’re going to have to join the same room with yuzu’s room browser. 
+Out of the box, we provide you with a bunch of public rooms hosted across the world by yuzu.
+Creating and joining rooms is extremely easy in yuzu and can be done in just a few clicks.
+
+{{< imgs "./room_browser.png" >}}
+
+If you’re a verified user, you can create a public room for people to join. 
+These public rooms can be seen by anyone using the room browser, but you can also put a password on them to restrict users. 
+Remember to port forward, otherwise your friends won’t be able to connect!
+
+Unverified users aren’t left without options, though - they still have the ability to create unlisted rooms, direct connecting, and can join any yuzu hosted room.
+
+Do note that verified users will have their privileges revoked for violating any site policies while on the room chatroom. 
+Please respect the "recommended game" listed in publicly hosted rooms, as even unrelated games will add to the bandwidth load.
+
+{{< imgs "./room_chat.png" >}}
+
+**Note: You can use these rooms for LAN mode games too - instead of ZeroTier or Hamachi.**
+
+## Development
+
+FearlessTobi began the development by leveraging the existing virtual rooms infrastructure from [Citra](https://citra-emu.org).
+Due to code similarities between yuzu and Citra, this tried and tested infrastructure easily became the foundation of this feature.
+
+Now that the virtual rooms were taken care of, Tobi moved onto the `LDN` service and its protocols.
+Using the research and code from the [ldn_mitm](https://github.com/spacemeowx2/ldn_mitm) project, he implemented the necessary changes for yuzu instances to communicate with each other over these virtual rooms.
+
+As the feature slowly matured, Tobi began leveraging yuzu's internal team of testers to test the feature across several titles for compatibilty and performance validation. 
+And to prevent user IPs from being leaked when connected to rooms, Tobi changed the implementation to use fake IPs for routing.
+
+With the multiple testing iterations, various bugs and glitches were found. 
+[german77](https://github.com/german77) relied on his own reverse-engineering and hardware tests, to debug these issues and fixed them all.
+He also made several UI fixes to improve its usability and brought the codebase up to yuzu standards.
+
+## Compatibility
+
+Please note that as this is the initial release of the feature, some games might have some limitations.
+We hope to slowly fix these over the course of next few months.
+
+yuzu's Local Wireless Multiplayer was tested by our testers across a small set of games and their corresponding compatibilty is as follows:
+
+{{< imgs "./compat.png" >}}
+
+
+## Screenshots
+
+{{< single-title-imgs
+    "Animal Crossing: New Horizons"
+    "./acnh1.jpg"
+    "./acnh2.png"
+>}}
+
+{{< single-title-imgs
+    "Pokémon Legends: Arceus"
+    "./arceustrade1.png"
+    "./arceustrade2.png"
+>}}
+
+{{< single-title-imgs
+    "Mario Kart 8 Deluxe"
+    "./mk8d_2.png"
+	"./mk8d_3.png"
+>}}
+
+{{< single-title-imgs
+	"Super Mario Smash Bros. Ultimate"
+	"./ssbu_ldn_3.png"
+	"./ssbu_ldn_4.png"
+	"./smash_ldn.png"
+>}}
+
+{{< single-title-imgs
+	"Splatoon 2"
+	"./splatoon2_1.png"
+	"./splatoon2_2.png"
+	"./splatoon2_3.png"
+>}}
+
+{{< imgs
+	"./lm3.png| Luigi's Mansion 3"
+>}}
+
+{{< imgs
+	"./cowabunga.png| Teenage Mutant Ninja Turtles: The Cowabunga Collection" 
+	"./diablo3.png| Diablo III: The Eternal Collection"
+>}}
+
+{{< imgs
+	"./monster_hunter_ultimate.png| Monster Hunter Generations Ultimate"
+	"./kirby_dream_buffet.png| Kirby's Dream Buffet"
+>}}
+
+
+
+## Fin
+
+As with any new update, we've tested the feature internally, but our efforts can't compare to the community as a whole. 
+We could have easily missed an edge case or some weird bug or issue among the vast collection of games with Local Wireless mode.
+So, please reach out to us on our [Discord](https://discord.gg/u77vRWY) and report any bugs you find, so that we can quickly address them.
+
+That's all we have for now, until next time! Happy emulating! <br><br>
+
+{{< article-end >}}