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rich-presence-udp

It's a UDP server that allows you to update your Discord Rich Presence.

usage

Windows via WSL

After invoking the executable for the first time, you'll have to accept the Windows Firewall security alert to allow inbound UDP traffic to your Windows host.

❯ GOOS=windows go build -o rich-presence main.go
❯ DISCORD_APP_ID=942604338927374438 WSLENV=DISCORD_APP_ID/w ./rich-presence.exe
❯ echo '{"state":"hello"}' | nc -uw0 "$WSL_HOST" 1992

Linux

It hasn't really been tested on Linux desktop, but I imagine it'd work just fine since the socket rich-go expects (e.g. $XDG_RUNTIME_DIR/discord-ipc-0) would actually exist, if you're running Discord for Linux.

❯ go build -o rich-presence main.go
❯ DISCORD_APP_ID=942604338927374438 ./rich-presence

misc

Some notes on the Windows via WSL invocation:

  • Assuming Discord is running on the Windows host, and not within WSL, we must build the binary with GOOS=windows so the underlying rich-go library can read from the named pipe Discord uses on Windows (i.e. \\.\\pipe\\discord-ipc-0).

    We can check for the existence of this named pipe as follows:

    ❯ powershell.exe '[System.IO.Directory]::GetFiles("\\.\\pipe\\")' | grep discord

  • Since we're invoking Windows executables from within WSL, we must also tell WSL to share with Windows any env vars we've set using WSLENV=DISCORD_APP_ID/w (see this blog post for more details).

  • After the server is running, we need a way to send messages to it. However, since we invoked a Windows executable, the server is bound to the host of the WSL instance. We can find that as follows:

    ❯ powershell.exe "
        Get-NetAdapter 'vEthernet (WSL)' |
        Get-NetIPAddress -AddressFamily IPv4 |
        Select -Expand IPAddress
"

    Note this is rather slow. I'd recommend adding this to the environment vars your login shell sets. I have mine set under WSL_HOST, like in the example above.