Chat Box Example

.lua

box = peripheral.wrap("chatBox_4")
-- box is the connected Chat Box

local open = rs.getInput("left") -- boolean, if the door is open
local wall = rs.getInput("right") -- boolean, if the wall is builded

while true do

-- with param1, you can check if the message is anything you like. 
-- with param2, you can check if the player's name is your name
local event, param1, param2 = os.pullEvent("chat") -- the chunk of the chat box needs to be loaded
    if(param2 == "Open the door") then -- param2 is the message and param1 is the player's name
        if(open == false) then
            -- send a message and activate the signal, if the door is closed
	    box.sendMessage("Sure, whatever you want")
            redstone.setAnalogOutput("left", 15)
            open = true
        else
            box.sendMessage("The door is already open.")
        end
    elseif(param2 == "Close the door") then
        if(open == true) then
	    box.sendMessage("Sure, whatever you want")
            redstone.setAnalogOutput("left", 0)
            open = false
        else
            box.sendMessage("The door isn't open.")
        end
    elseif(param2 == "Build the wall") then
        if(wall == false) then
            box.sendMessage("Sure, whatever you want")
            redstone.setAnalogOutput("right", 15)
            wall = true
        else
            box.sendMessage("The wall is already here!")
        end
    elseif(param2 == "Destroy the wall") then
        if(wall == true) then
            box.sendMessage("Sure, whatever you want")
            redstone.setAnalogOutput("right", 0)
            wall = false
        else
            box.sendMessage("There is no wall")
        end
    end
    
end