broadcast battery levels

rednet.open("top")
induction = peripheral.wrap("back")

function rnd (val, dec)
  local X = math.pow(10, dec)
  return math.floor(val * X) / X
end

function pwr (val, dec)
  local pre = ''
  local suf = ''

  local is_neg = false
  if val < 0 then
    pre = '-'
    is_neg = true
    val = -val
  end

  val = mekanismEnergyHelper.joulesToFE(val)

  if val > 1000 then
    suf = 'k'
    val = val / 1000
  end

  if val > 1000 then
    suf = 'M'
    val = val / 1000
  end

  if val > 1000 then
    suf = 'G'
    val = val / 1000
  end

  if val > 1000 then
    suf = 'T'
    val = val / 1000
  end

  return pre .. rnd(val, dec or 1) .. suf
end

function broadcastBattery()
  while true do
    messageToSend = "Battery "
    messageToSend = messageToSend .. induction.getEnergyFilledPercentage() * 100 .. "% "
    messageToSend = messageToSend .. "In: " .. pwr(induction.getLastInput()) .. " Out: " .. pwr(induction.getLastOutput())
    rednet.broadcast(messageToSend, "battery")
    sleep(20)
  end
end

broadcastBattery()