onoffclient.lua

local event = require('event')
local fs = require('filesystem')
local component = require('component')
local net = component.modem
local rs = component.redstone
local running = true

-- Callbacks
local function networkCallback(type, myaddr, senderaddress, port, distance, message)
  -- print(myaddr .. " " .. senderaddress .. " " .. port .. " " .. distance .. " " .. message)
  if port == 123 then
    if message == "on" then
      for k,v in component.list() do
        if v == "colorful_lamp" then
          component.proxy(k).setLampColor(31744)
        end
      end
    elseif message == "off" then
      for k,v in component.list() do
        if v == "colorful_lamp" then
          component.proxy(k).setLampColor(0)
        end
      end
    end
  end
end


-- Main Code

net.open(123)

event.listen("modem_message", networkCallback)

while running do
  os.sleep(10)
end