BRUM'S SLAVE COMPUTER 0.2

--#########BRUM'S SLAVE COMPUTER ############

-- System Variables
local sides = {"left", "bottom", "top", "right", "back"}
local myId = os.getComputerID()
local version = 0.2
local connected = false



-- Find what side the modem is on and open the modem to the network
function peripherals()
    for i = 1, 5 do
        if peripheral.getType(sides[i]) == "modem" then
                modem = peripheral.wrap(sides[i])
                rednet.open(sides[i])
                modemside = (sides[i])
        end
    end
end

peripherals()

--######### USER VARIABLES ############
local myName = "Slave 1"
--#####################################


function startup()
    print("#########BRUM'S SLAVE COMPUTER ############")
    print("Version: " ..version)
    print("Computer ID: " ..myId)
    print("Computer Name: " ..myName)
    print("Modem Side: " ..modemside)
    findMaster()
end

function findMaster()
    while connected == false do
        print("INFO: Attempting to find master computer...")
        rednet.broadcast(myName)
        local id, response = rednet.receive(4)
        if response == "hello from master" then
            masterId = id
            print("Successfully Connected to master")
            print("Master computer ID: "..masterId)
--[[            masterId = tonumber(id)   -- try to convert it to a number
                if masterId == nil then
                error("Error: "..masterId .." is not a valid number")
                else
                print("INFO: Successfully converted id to number")
                end
--]]
            connected = true
            pingMaster()
        else
        sleep(3)
        end
    end
end

function pingMaster()
sleep(10)
    while connected == true do
        print("Pinging master...")
        rednet.send(masterId, "still there?")
        local id, response = rednet.receive(4)
        if id == masterId and response == "Yep! still here." then
            print("INFO: Master responded:" ..response)
            sleep(10)
            connected = true
        else
            connected = false
        end
    end
end

sleep(3)
startup()