Mod is not required on the client

[Roland]

Hello.

I'm writing my first mod. It must be installed on both sides (server and client). But when I install it on server and then try to connect without the mod on client it let me connect to server. Yes, Forge is installed to server and client.

For example, I can't do the same with Industrial Craft 2 Classic or "Iron Chests" mod (it not let me connect to server without client-side part).

Why is it happening? What I do wrong? How to force client to install my mod? I was googling about 6 hours yesterday with no result.

 

[Roland]

Okay, I got it. My code was like:

        INSTANCE = NetworkRegistry.newSimpleChannel(new ResourceLocation(Mod.MOD, "main"),
                () -> "1.1",
                s -> true,
                s -> true);

But it should be like:

    private static final String PROTOCOL_VERSION = "1.1";

    // ... 

    INSTANCE = NetworkRegistry.newSimpleChannel(new ResourceLocation(Mod.MOD, "main"),
                () -> PROTOCOL_VERSION,
                PROTOCOL_VERSION::equals,
                PROTOCOL_VERSION::equals);

So the answer is:

1) You have to have networking in your mod. Even if you dont use it;

2) It should be written as example above.

Edited January 16, 2023 by Roland
More information added