websocketd 0.3.1-3 (arm64 binary) in ubuntu focal

 websocketd is a small command-line tool that will wrap an existing
 command-line interface program, and allow it to be accessed
 via a WebSocket.
 .
 WebSocket-capable applications can now be built very easily. As long as
 you can write an executable program that reads STDIN and writes to STDOUT,
 you can build a WebSocket server. Do it in Python, Ruby, Perl, Bash,
 C, Go, PHP, Java, Clojure, Scala, Groovy, Expect, Awk, VBScript,
 Haskell, Lua, R, whatever! No networking libraries necessary.
 .
 websocketd will start a WebSocket server on a specified port, and listen
 for connections.
 .
 Upon a connection, it will fork the appropriate process, and disconnect
 the process when the WebSocket connection closes (and vice-versa).
 .
 Any message sent from the WebSocket client will be piped to the process's
 STDIN stream, followed by a \n newline.