potionDispenserNodeStartup

local modem = peripheral.find("modem", rednet.open);

local itemFilename = "item"

local protocol = "Potion_Brewer_Ingredient_Dispenser_Node_v001"
local logging = "Potion_Brewer_LOGGER"

local item = ""

function log(string)
    print(string)
    rednet.broadcast("[DISPENSER_NODE_"..item.."] "..string, logging)
end

function init()
    --turn out rs output
    rs.setOutput("back", false)

    -- get this nodes item id
    local itemFile = fs.open(itemFilename, "r")
    if itemFile then
        item = itemFile.readAll()
        itemFile.close(itemFile)
    else
        log("failed to open item file: "..itemFilename)
    end

    log("Items file loaded, this node is: "..item)

    rednet.host(protocol, item)

    --wait for an event to dispense the item
    while true do
        --receive messages
        local senderID, message = rednet.receive(protocol)
        print(message)

        if message == "EVENT_DISPENSE_" .. item then
            --send the redstone pulse
            log("attempting to dispense item: " .. item)

            rs.setOutput("back", true)
            os.sleep(0.5)
            rs.setOutput("back", false)

            --respond with a dispense started event
            rednet.broadcast("EVENT_DISPENSE_STARTED_" .. item, protocol)
            log("dispensed item: " .. item)
        end
    end
end

init()