main

-- Wrap the modem and monitor
local mon = peripheral.wrap("top")
local wmod = peripheral.wrap("back")

-- Close all channels by default in case
-- users have other transmissions in air
wmod.closeAll()

-- Open different channels for different liquids
-- Only 2+3 are open by default, open the
-- ones you're using to prevent errors.
wmod.open(2)   -- water?
wmod.open(3)   -- lava?
--wmod.open(4)   -- x
--wmod.open(5)   -- x
--wmod.open(6)   -- x
--wmod.open(7)   -- x
--wmod.open(8)   -- x
--wmod.open(9)   -- x
--wmod.open(10)  -- x
--wmod.open(11)  -- x
--wmod.open(12)  -- x

mon.clear()
mon.setTextColor(colors.white)
mon.setCursorPos(1,1)
mon.write("Tank:")

-- Main loop, never stop
while true do

  -- Check for incoming data on any open channel
  local event, modemSide, senderChannel, replyChannel, message, senderDistance = os.pullEvent("modem_message")

  -- Add one case for every liquid
  -- Change channel and text for each

  -- First check color
  if string.match(message, ".red.") then
    mon.setTextColor(colors.red)
    message = string.gsub(message, ".red.", "")
  elseif string.match(message, ".green.") then
    mon.setTextColor(colors.green)
    message = string.gsub(message, ".green.", "")
  end

-- I have prepared for 11 channels.
-- They should match channels up at top!

  if senderChannel == 2 then
    mon.setCursorPos(1,2)
  elseif senderChannel == 3 then
    mon.setCursorPos(1,2)
  elseif senderChannel == 4 then
    mon.setCursorPos(1,4)
  elseif senderChannel == 5 then
    mon.setCursorPos(1,5)
  elseif senderChannel == 6 then
    mon.setCursorPos(1,6)
  elseif senderChannel == 7 then
    mon.setCursorPos(1,7)
  elseif senderChannel == 8 then
    mon.setCursorPos(1,8)
  elseif senderChannel == 9 then
    mon.setCursorPos(1,9)
  elseif senderChannel == 10 then
    mon.setCursorPos(1,10)
  elseif senderChannel == 11 then
    mon.setCursorPos(1,11)
  elseif senderChannel == 12 then
    mon.setCursorPos(1,12)
  end

  mon.write(message .."        ")
  print("Received " ..message)
end