pen.lua

local PenMode = {}

function PenMode:activate()
  self.prompt = "Title:"

  self.letter = game.spawn_object("testing:letter")
  self.letter.title = "Letter from " .. self.player.name

  self.letter.data:set("from", self.player.name)
  self.letter.data:set("title", "")
  self.letter.data:set("body", "")

  self.state = 1
end

function PenMode:deactivate() 
  self.player.inventory:add(self.letter)
end

function PenMode:input(input)
  if self.state == 1 then
    self.player:send("Enter the body, typing '\\q' to exit.")
    self.letter.data:set("title", input)

    self.state = 2
    self.prompt = "Body:"
  elseif self.state == 2 then
    if input == "\\q" then
      self.player:send("Letter written.")
      self.player:release(self)

      return
    end

    self.letter.data:set("body", self.letter.data:get("body") .. "{nl}" .. input)
  else
    error("Invalid State: " .. self.state)
  end
end

object.commands:add("write", function(player, arg)
  PenMode.player = player

  player:hijack(PenMode)

  return true
end)

roomba.lua

game.timers:add(8 * 60, function()
  local exits = {}

  for _, e in pairs(mobile.room.exits) do
    if not e.locked and not e.closed then
      if not e.tags:contains("no-wander") and not e.room.tags:contains("no-wander") then
        exits[#exits + 1] = e
      end
    end
  end

  local r = exits[math.floor(math.random(1, #exits))].room

  mobile.room = r;
end, true)