plethora sending the item count of a chest

--use the plethora mod
local modem = peripheral.wrap("top")
local chest = peripheral.wrap("back")
modem.open(1) --do nothing, never used

function state_of_chest()
    local list_of_item = chest.list() --return the slot number and a table where the keys are "count","name","damage"
    total = 0
    for slot,info in pairs(list_of_item) do
      if info.name == "minecraft:stone" then
        total = total + info.count
        end
    end
    modem.transmit(5,1,total) -- channel for sending, channel for the answer, message
end

while true do
    state_of_chest()
    os.sleep(1)
end