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Hullrot is a minimalist Mumble server with immersive integration with the online role-playing game Space Station 13.

Features include:

  • Local talk by default, so only others in vision range can hear you.
  • Push-to-talk over any of the character's available radio channels.
  • Handling of intercoms, holopad calls, and hot-miked radios.
  • Headsets going inactive if station telecomms is disabled.

Hullrot requires integration with the game server to pass information back and forth. For an example integration, grep for hullrot in our tgstation branch.

Hullrot is still evolving. If you are interested in using it and the documentation is insufficient, feel free to contact the author directly.


The Rust compiler:

  1. Install the Rust compiler's dependencies (primarily the system linker):

  2. Use the Rust installer, or another Rust installation method, or run the following:

    curl -sSfo
    chmod +x
  3. Set the default compiler to 32-bit:

    # in the `hullrot` directory...
    cd hullrot
    # Linux
    rustup override add stable-i686-unknown-linux-gnu
    # Windows
    rustup override add stable-i686-pc-windows-msvc

System packages (OpenSSL, Opus, Protobuf):

  • Ubuntu and Debian users run:

    sudo apt-get install libssl-dev:i386 libopus-dev:i386 protobuf-compiler pkg-config:i386
  • Windows (GNU/MSYS2) users run:

    pacman -S mingw-w64-i686-{openssl,opus,protobuf}
  • Windows (MSVC) users:

  • Other distributions install the appropriate 32-bit development and 32-bit runtime packages for OpenSSL, Opus, and the Protobuf compiler.

Note: only the BYOND integration requires building in 32-bit mode, but the rest of this README will assume 32-bit for simplicity.


The cargo tool handles compilation, as well as automatically downloading and compiling all Rust dependencies. To compile in release mode (recommended):

cargo build --release

A binary (hullrot.exe or hullrot) and a library (hullrot.dll or will be produced in target/release. The binary is the Mumble server, and the library is a small RPC client for controlling the server suitable for BYOND integration.


The Hullrot binary is a standalone Mumble server. It expects to be reachable by players on both TCP and UDP. It also exposes a control channel using a simple JSON-based RPC. By default, the control channel is only accessible by clients on the same host.

Running Hullrot for the first time will create a config file hullrot.toml as well as a self-signed certificate. Use hullrot.toml to configure the servers, and use a CA such as Let's Encrypt if self-signed certificates are insufficient.

Passing the name of a config file as a command-line argument will cause Hullrot to use that config file instead.

Space Station 13

Hullrot's DM code will need to be integrated into your codebase. The primary implementation should be straightforward to port to any /tg/station fork:

The exact behavior - who can speak to who when, what radio channels are available, which mobs are restricted from using the radio - can be understood by reading and adjusted by modifying the DM code.

The Hullrot library (the .dll or .so produced earlier) will need to be made visible to BYOND, either by being placed in the world directory or in BYOND's bin directory. If hosting on Linux, the references to "hullrot.dll" in the DM code will need to be changed to "".

Other Games

Games with a similar foreign function interface to BYOND may choose to re-use the Hullrot library. All functions in the library follow the signature extern "C" const char* hullrot_foo(int argc, const char** argv) and return responses as a JSON blob. On failure, the blob will be an object with one key, "error".

  • hullrot_dll_version - returns the version of the control client library.
    • {"version": "0.1.0", "major": 0, "minor": 1, "patch": 0}
    • Clients should check that major is exactly the value they expect, and that minor is at least the value they expect.
    • Ignores its arguments.
  • hullrot_init - initializes the control connection and returns the first control message received from the server.
    • Errors if the control connection could not be made.
      • {"error": "The connection was refused."}
    • On success, the first control message should be a Version:
      • {"Version": {"version": "0.1.0", "major": 0, "minor": 1, "patch": 0}}
    • Clients may check that major is exactly the value they expect, and that minor is at least the value they expect.
    • Ignores its arguments.
  • hullrot_control - sends each of its arguments (which should be JSON blobs) as control messages to the server.
    • Returns a JSON list of control messages received from the server.
    • May be called with no arguments to poll for incoming control messages.
  • hullrot_stop - disconnect from the server, blocking until completion.
    • Ignores its arguments and returns the empty object {}.

Games may also use their own socket facilities. The control channel is a simple TCP connection. Messages are framed by unsigned big-endian 32-bit integer length prefixes, and are encoded as JSON blobs.

See the definitions of enum ControlIn and enum ControlOut in src/ for details on the control messages, and the integrations/ directory for example clients.


Hullrot is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

Hullrot is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License along with Hullrot. If not, see


A minimalist Mumble server with immersive Space Station 13 integration.