explosionReceiver.lua

local component = require("component")
local event = require("event")
local sides = require("sides")
local wirelress = component.modem
local redstone = component.redstone

local port = 904
local singal = false
local on = 15
local off = 0

local running = true

function setRedstone()
  if signal then
    redstone.setOutput(sides.north, on)
  else
    redstone.setOutput(sides.north, off)
  end
end

setRedstone()

while running do
  local _, _, from, port, _, command, value = event.pull("modem_message")
  if command == "redstone" then
    wireless.broadcast(port, signal)
  elseif command == "set" then
    signal = value
    setRedstone()
  end
end