spawner.lua

local args = {...}
local channel = 70

if args[1] == nil then
   return
end

local modem = peripheral.wrap("back")

-- spawner table
local spawners = {}
spawners["blaze"] = "1"
spawners["enderman"] = "2"
spawners["wither_skeleton"] = "3"

function printSituation(situation)
    local name = ""
    for k,v in pairs(spawners) do
        if v == situation:sub(1,1) then
            name = k
        end
    end
    if situation:sub(2,2) == "1" then
        print(name .. ": on")
    else
        print(name .. ": off")
    end
end

-- spawner get
if args[1] == "get" then
    modem.open(channel)
    modem.transmit(69,channel,"11")
    local event, modemSide, senderChannel, replyChannel, message, senderDistance = os.pullEvent("modem_message")
    --print(message)
    for i = 1,message:len(),2 do
        printSituation(message:sub(i,i+1))
    end
    return
end

-- spawner on/off
-- check if it is valid
local valid = false
for k,v in pairs(spawners) do
    if k == args[1] then
        valid = true
    end
end
if not (args[2] == "on" or args[2] == "off") then
    valid = false
end
if valid == false then
    print("Invalid command")
    return
end
-- perform on/off
local entityid = ""
for k,v in pairs(spawners) do
    if k == args[1] then
        entityid = v
    end
end
if args[2] == "on" then
    modem.transmit(69,channel,"10" .. entityid .. "1")
else
    modem.transmit(69,channel,"10" .. entityid .. "0")
end