glass = peripheral.wrap( "bottom" )

rednet.open( "back" )

-- Constants
pos_x = 40
pos_y = 45
pos_inc = 10
color = {}
color["on"] = 0x229000
color["off"] = 0xFF0000

-- Devices

-- Device status
status = {}
function addStatus( device, mode )
  status[device] = glass.addText( pos_x, pos_y, device, color["off"] )
  pos_y = pos_y + pos_inc
end

while true do
  local command = ""
  local device = ""
  local mode = ""

  senderID, message, distance = rednet.receive()
  print( senderID .. ": " .. message )

  for i in string.gmatch( message,  "%S+" ) do
    if command ~= "" and device ~= "" then
      mode  = i
    end
    if command ~= "" and device == "" then
      device = i
    end
    if command == "" and device == "" then
      command = i
    end
  end

  if nil status[device] then
    addStatus( device, mode )
  else
    status[device].setColor( color[mode] )
  end
end

rednet.close( "back" )