mine controller with advanced peripherals

-- pastebin get hVaGS1K6

local distanceWeight = -2
local blockScoreWeight = 1

local controllerID = os.getComputerID()

local commands = {
    ["default"] = {
        ["minY"] = 2,
        ["maxY"] = 12,
        ["blockScores"] = {
            --["minecraft:andesite"] = 100,
            ["minecraft:diamond_ore"] = 10,
            ["minecraft:gold_ore"] = 8,
            ["minecraft:iron_ore"] = 5,
            ["minecraft:coal_ore"] = 16,
            ["minecraft:redstone_ore"] = 0.1,
            ["minecraft:lapis_ore"] = 0.15,
            ["minecraft:emerald_ore"] = 50,
            ["minecraft:oak_log"] = 9,
            ["minecraft:dark_oak_log"] = 9,
            ["minecraft:birch_log"] = 9,
            ["minecraft:jungle_log"] = 9,
            ["minecraft:acaia_log"] = 9,
            ["minecraft:nether_gold_ore"] = 5,
            ["minecraft:nether_quartz_ore"] = 5,
            ["minecraft:ancient_debris"] = 30,
            ["minecraft:crying_obsidian"] = 31,
            ["minecraft:obsidian"] = 1,
            ["minecraft:glowstone"] = 15,
            ["minecraft:sand"] = 3,
            ["minecraft:soul_sand"] = 3
        }
    },
    ["desertSand"] = {
        ["minY"] = 80,
        ["maxY"] = 120,
        ["blockScores"] = {
            ["minecraft:sand"] = 100
        }
    },
    ["tree"] = {
        ["minY"] = 60,
        ["maxY"] = 100,
        ["blockScores"] = {
            ["minecraft:oak_log"] = 20,
            ["minecraft:dark_oak_log"] = 20,
            ["minecraft:birch_log"] = 20,
            ["minecraft:jungle_log"] = 20,
            ["minecraft:acaia_log"] = 20
        }
    }
}

local IDs = {
    [21] = "desertSand",
    [19] = "tree"
}

rednet.open("top")

local lastSeen = {}

print("Started controller")

while true do
    local id, message = rednet.receive()
    print("-----------------------------")
    print("[" .. tostring(os.date()) .. "] Message from " .. id .. ": ")--textutils.formatTime
    print(textutils.serialize(message))
    print("-----------------------------")

    lastSeen[id] = message
    local file = fs.open("lastSeen", "w")
    file.write(textutils.serialize(lastSeen))
    file.close()

    local toSend = commands["default"]

    if IDs[id] ~= nil then
        toSend = commands[IDs[id]]
    end

    toSend["timestamp"] = os.time()

    rednet.send(id, toSend)
end