ComputerCraft Ender Tank

-- Transmitting first tank level connected to ender tank
display_line = 1
display_name = "Ender tank"
display_unit = "B"

ender_side = "back"
modem_side = "top"
modem_channel = 100
send_interval = 3

-- Init
ender = peripheral.wrap(ender_side)
modem = peripheral.wrap(modem_side)
modem.open(modem_channel)

function update()
    tank = ender.getTanks()[1]
    msg = textutils.serialize({display_line, display_name, tank.amount, tank.capacity, display_unit})
    print("Sent message")
    print(msg)
    modem.transmit(modem_channel, modem_channel, msg)
end

-- Run endlessly
print("Started")
timer = os.startTimer(1)
while true do
    event, param = os.pullEvent()
    if event == "key" then
        break
    elseif event == "timer" and param == timer then
        update()
        timer = os.startTimer(send_interval)
    end
end
print("Stopped")