test.lua

local websocket = require('websocket.client').sync;


local monitor = peripheral.find("monitor");

local function printM(string)
    monitor.write(string);
end


local ws;

local function init()
    if ws then
        ws:close();
        ws = nil;
    end

    ws = websocket();
    local ok, err = ws:connect("ws://localhost:8080");
    if not ok then
        print("Connection error: " .. (err or "Unknown error"));
        return;
    end

    print('Connection Opened!');
end

init();

while true do
    local message, err = ws:receive();
    if message then
        printM(message);
    elseif err == "closed" then
        print("Connection Closed");
        ws = nil;
        break;
    else
        print("error" .. err);
    end
end