Lewin Kelly Heliodex

Heliodex project update – November 2025

It is the season... of Mercury, of course. I'm recovering from the mental whiplash of Mercury 3 shifting into higher development velocity. Here's some of the things that have been happening with my projects recently.

Mercury

On 9 December 2025, we hosted the first session of Mercury News in a while, alongside a giveaway 400 Robux for everyone who attended. It was intended to last around 45 minutes, and actually did last that long, despite my rambling on about the prospects of the upcoming new Economy service.
Mercury 3 now has over 50 registered beta testers on site, making it the same size as Mercury 2 was in March 2023. We've been irregularly terminating some of the inactive accounts, though this user count number includes those which have been moderated.

On the [ledgertests](https://github.com

Heliodex project update – October 2025

Ah, yeah, this again. Welcome back to my monthly Heliodex project update! This month has still been plenty busy, though it's the first update in a year that I didn't significantly work on Coputer. You'll see where I spent most of my time instead below.

Mercury

The Mercury 3 website is now available at mercs.dev, with documentation at docs.mercs.dev. Its hosting has been moved to my own dedicated server, living alongside the RCCService instance. This is done with PM2, and its configuration file has been added back to the repository. Dedicated gameservers are running on a Windows VM hosted on Azure (burning through my free credits, not paying them anything yet lol).

The implementations of the new RCCService proxy and [gameserver arbiter](https://github.com/tp-link-extender/RCCService/tree/main/Gam

Heliodex project update – September 2025

September doesn't seem to have been eternal this year. However, given how much I'm already seeing about the upcoming Halloween, it almost seems like October will be. Here's another monthly update!

Mercury

Mercury 3 has entered its private beta testing phase, and now has 28 users on site, all creating status & forum posts, places, assets, and spending currency. An RCCService instance is set up on my dedicated server, accessed from the site running on the Windows VPS, so the reverse of the architecture of Mercury 2. This probably won't stay this way for long though, and we're practising site backups in preparation for another server migration.

The RCC is used for avatar and clothing rendering at the moment, with shirt renders recently being fixed to work properly. Since it's running on OpenSUSE it has to run over a compatibility layer. We're using Wine, which did require a lot of configuration especially a

Heliodex project update – August 2025

It's that time of the month again. The summer and its holidays are finally over, so here's a quick update on what I've been up to over August (and the first few days of September).

Mercury

Work on Mercury 3 is getting back up to speed, and the site is now hosted again, albeit unreliably, for a basic alpha test. Taskmanager wants a beta testing phase to begin within the next week or 2. A new system for management of assets has been introduced, separating a few different categories of asset:

Builtins: Assets bundled with the client or studio. These are not requested from the site. (animations, humanoid scripts, studio plugins to an extent)
Privileged assets: Assets loaded directly or indirectly by scripts sent to the client. This includes:

Heliodex project update – July 2025

Another project update! I never know what to write in the first paragraph of these things. Here's what I've worked on over the last month.

Mercury

The documentation site on the docs branch has been updated with articles on installation of certain tools and further integration guides.

I've been experimenting with different ways to start up and manage Mercury's external services, mainly the Database and Economy service. This has usually been done with Docker, which is great when it works though often has issues on machines with poor support for virtualisation. Starting each process independently is difficult to manage. I tried using my own tool for this, which worked surprisingly well, but would shut down if its parent terminal was closed. Recently I tried Nomad, which

Heliodex project update – June 2025

Hey all, welcome to another project update. I've been inside drinking plenty of water and writing plenty of code recovering from the unbearable Scottish summer heat of over 15°C.

Mercury

At the moment, I'm working on 2 branches in the Mercury Core repository: assets and docs. The assets branch contains some updates to the Economy service, allowing it to handle asset transactions for limited and unlimited assets. It also reduces the complexity of currency by making stipends constant and removing fees, which may destabilise the economy somewhat, but we'll find that out in the future. The docs branch contains a basic documentation site for Mercury Core and related services, which is still a work in progress. As outlined in [#389](https://github.com/tp-link-extender/MercuryCore/issues

Heliodex project update – May 2025

Hello all, here's another monthly project update. The summer holidays have started, so I'm away at the moment, but I've still had lots of time to code some cool things.

Mercury

The jokes, hoaxes, and memes have all turned out to be true. There will be a Mercury 3.

Mercury 3 will be hosted on the domain xtcy.dev. We have a working DLL hook for the 2013 client & studio (same as previous Mercuries) and a Windows Server VPS for running Mercury Core, RCCService, and related services.

Heliodex project update – April 2025

Welcome, again, to another monthly update. This one's right in the middle of my exam season! How convenient.

Mercury Core

Mercury Core is back to life now, after a few months of inactivity. The codebase has been given some much needed TLC & dedusting and I'm working on improving many of its parts – at the moment the 'communication' branch contains a rewrite of the forum, status updates, and asset comments into a single system, as well as improvements for likes/dislikes.

The database schema has also been significantly improved, the auth system has been rewritten without the need for Lucia v3 (thank you lucia!), all components have been migrated to use Svelte 5 syntax and features, fixes have been applied to the economy service, and many miscellaneous formatting and styling fixes have been made, as usual.

Heliodex project update – March 2025

Happy holidays! The year is Marching on, so I hope everyone is doing well; here's some updates on the projects I've been working on.

Coputer

Coputer now features a number of 'program types' for programs to accept and return certain values. Current program types are as follows:

Test programs, which take no arguments and return nothing, for the purposes of debugging Litecode
Web programs, which take a few web request parameters and return a web response

	type MIU =
	\| M
	\| I
	\| U

	type String = MIU list

	let str (s: String) : string =
	s
	\|> List.map (function