--requires
local component = require("component")
local event = require("event")
local modem = component.modem

--port
local chatPort = 312

--listen
function doListen(localAddress, remoteAddress, port, distance, from,  message)
    if(port ~= chatPort) then return end
    print(from .. ": " .. message)
end

--intro / input
io.write("Welcome to GlobalChat!\nEnter a nickname: ")
local nickname = io.read()

io.write("Welcome, "+nickname+", you are now chatting with everyone else running this program.\n")

event.listen("modem_message", doListen)

while true do
    --io.write(">")
    local msg = io.read()
    modem.broadcast(chatPort, nickname, msg)
end