Angel's Program (Fixed)

local component = require("component")
local sides = require("sides")
local event = require("event")
local colors = require("colors")

local md = component.modem
local rs = component.redstone

local char_space = string.byte(" ")
local running = true
local carts = 0
local railport = 1234 -- Change this to whatever port you're broadcasting train status stuff on

md.open(railport)

local function rsTest()
  if rs.getBundledInput(sides.north, colors.blue) > 0 then
    return true
  else return false
  end
end

local function unknownEvent()
end

local myEventHandlers = setmetatable({}, { __index = function() return unknownEvent end})

function myEventHandlers.key_up(adress, char, code, playerName)
  if (char == char_space) then
    rs.setBundledOutput(sides.north, colors.yellow, 0)
    running = false
  end
end

function handleEvent(eventID, ...)
  if (eventID) then
    myEventHandlers[eventID](...)
  end
end


while running do
handleEvent(event.pull())
  if (carts >= 5) then
    rs.setBundledOutput(sides.north, colors.yellow, 250)
    md.broadcast(railport, "Change this to whatever you want your network message to be")
  end

  if (rsTest()) then    -- Let's check for the directional detector track to have a signal.
    carts = carts + 1
    print(tostring(carts)) -- Debug Output
  end

  os.sleep(0.25) -- Adding this so you can Ctrl+Alt+C out of your program. There are cleaner ways of doing this,
              -- such as pressing 'space' to exit but you would have to code an event handler, or use
              -- one that Kodos wrote
end