Sending table over rednet is always nil

Hello,

I'm struggling to get a program I found on here working (http://www.computerc...onitor-program/).

For some reason, in the receiver, the table exists but the subcomponents are always nil. I consistently get an error saying ".temp:28: attempt to index ? (a nil value) when checking mes.active.

The code for the receiver:

-- program to print valuable information
-- about reactor

rednet.open("right")
local mon = peripheral.wrap("left")
local protocol = 1
term.redirect(mon)
term.clear()

while true do
local id, mes, pro = rednet.receive(protocol, 5)
term.redirect(mon)
term.clear()
sleep(0.5)
term.setCursorPos(1,1)
mon.setTextScale(0.5)
if mes == false then
  write("STATUS: ")
  mon.setBackgroundColor(colors.red)
  write("ERROR")
  mon.setBackgroundColor(colors.black)
  print()
  print()
  print("Something is wrong with program or reactor setup")
  print("Hold Ctrl+T to terminate program")
else
  write( "STATUS: ")
  if mes.active == true then
	mon.setBackgroundColour(colors.lime)
	write("ACTIVE")
  elseif mes.active == false then
	mon.setBackgroundColour(colors.yellow)
	write("NOT ACTIVE")
  end
  mon.setBackgroundColor(colors.black)
  print()
  print()
  print("Energy Production: " .. math.floor(mes.energyOutput,0) .. " EU/t")
  print("Tank Info; " .. mes.tankInfo .. " RF")
  print()
  print("Temperature: " .. mes.reactorTemp .. " C")
  print("Max Temperature: " .. mes.reactorMaxTemp .. " C")
end
sleep(0.1)
end

code for the sender:

-- program to monitor reactor health
rednet.open("left")
local reactor = peripheral.wrap("right")
local protocal = 1

while true do
  works = reactor.isValid()
  if works == false then
	rednet.broadcast(works, protocol)
	sleep(0.1)
  else
	--ractive = reactor.isActive()
	--rheat = reactor.getHeat()
	--rmheat = reactor.getMaxHeat()
	--reuout = reactor.getEUOutput()
	--rtank = reactor.getTankInfo()
	local mytable =
	{
	  active = reactor.isActive(),
	  reactorTemp = reactor.getHeat(),
	  reactorMaxTemp = reactor.getMaxHeat(),
	  energyOutput = reactor.EUOutput
	  --tankInfo = rtank
	}
	rednet.broadcast(mytable,protocol)
	sleep(0.1)
  print(mytable.active)
  print(mytable.reactorTemp)
  print(mytable.reactorMaxTemp)
  print(mytable.energyOutput)
  print(mytable.tankInfo)
  end
end

What version of computercraft do you have? Some versions didn't allow sending tables over rednet directly.

I'm using the latest Infinity Evolved pack on Curse and it says it has ComputerCraft1.75.jar

In that case, I bet rednet.receive is timing out (you have it set to 5 seconds) and returning nil.

If it returns nil, you try to index it because it's not false.

But the sender and the receiver are only a few blocks apart and the sender should be sending several times a second. How can the receiver be timing out? I've also tried increasing the timeout to as much as 30 seconds and it still times out.

Sorry for these late responses. I had to create a new account for this and I have to wait for my posts to be approved

oh ik protocol isnt defined but protocal is defined d: line 4 sender

local protocal = 1

TheRockettek, on 28 August 2016 - 08:48 PM said:

oh ik protocol isnt defined but protocal is defined d: line 4 sender

local protocal = 1

Thank you!! This was the problem. Thank you with the eagle eyes

on a side note, its a big reactor program, and makes RF, if you want it in EU you need to recalculate it down dont you?
1 EU = 4 RF

EDIT: im being a derp sorry :P/>

the rf/eu ratio is different for different modpacks. Eg: its 1eu/10rf in tekkit classic