cb.lua

local component = require("component")
local chatbox = component.chat
local ss = require("term")
local text = require("text")

print("Write your name: ")
local n = ss.read()
local n = text.trim(n)
chatbox.setName(n)

while true do

    function output()
        local v = ss.read()
        local v = text.trim(v)
        chatbox.say(v)
    end

    output()

end