Can I use Caddyfile and layer4 together?

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I’m using Caddy to serve a couple of sites/services, usually by forwarding them to a docker container. For this I’m using a Caddyfile. I would really like to keep the Caddyfile to configure the sites, in fact one of my main reasons to switch from nginx to Caddy was that adding a site in Caddy is 3 lines while in nginx it’s 30 or so.

But now I would like to use the same* Caddy to terminate SSL (TLS) for an MQTT server. I think this is possible using the layer4 app, but I also think the layer4 app can only be configured using JSON.

Now I’m not sure what would be the best way to plug these together. I could probably hack together a shell script that uses caddy adapt and jq to build a final JSON config, but this comment in a thread about a similar use case somewhat suggests there might be a better, caddy-internal solution?

What would be your advice?

* I could run another Caddy on a port other than 443, but I vaguely remember that it breaks the Let’s encrypt challenges.

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caddy-l4 doesn’t have official Caddyfile support. But there is a plugin that can add some primitive support for it via Caddyfile global options:

Otherwise, your only option is to adapt your Caddyfile to JSON, then manipulate it to add your layer4 stuff to it.

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