net = {}
net.id = computer.address():sub(1,8)
net.np = 4957
net.tm = {}
function net.send(id,po,msg) -- id, port, message
 event.push("sendmsg",id,po,msg)
end
if cdlib and relib then
spawn("copperd",function() print(pcall(function ()
 local pt = {}
 local ps = {}
 for a,t in component.list("modem") do
  table.insert(net.tm,component.proxy(a))
  component.proxy(a).open(net.np)
 end
 while true do
  local ev = {event.pull()}
  if ev[1] == "rsendmsg" then
   dst,data = ev[2],ev[3]
   for k,v in ipairs(net.tm) do
    v.broadcast(net.np,"copper",cdlib.encode(0,net.id,dst,data))
   end
  elseif ev[1] == "sendmsg" then
   local p = {}
   p.pid = string.char(math.random(255),math.random(255),math.random(255))
   p.nid = ev[2]
   p.port = ev[3]
   p.msg = ev[4]
   p.at = 0
   p.lt = 0
   pt[cdlib.encode(0,net.id,p.nid,relib.encode(p)):sub(2)] = os.time()
   ps[p.pid] = p
  elseif ev[1] == "modem_message" and ev[4] == net.np and ev[6] == "copper" then
   local hops,src,dst,data = cdlib.decode(ev[7])
   if not pt[ev[7]:sub(2)] then
    pt[ev[7]:sub(2)] = os.time()
    if dst == net.id then
     event.push("net_rmsg",src,data)
     local pd = relib.decode(data)
     if pd then
      if pd.pt == 1 then
       event.push("net_msg",src,pd.port,pd.msg)
       pd.pt = 2
       pd.nid = src
       pd.lt = 0
       pd.msg = ""
       ps[pd.pid] = pd
      elseif pd.pt == 2 then
       ps[pd.pid] = nil
      end
     end
    else
     if hops < 255 then
      for k,v in ipairs(net.tm) do
       v.broadcast(net.np,"copper",cdlib.encode(hops+1,src,dst,data))
      end
     end
    end
   end
  end
  for k,v in pairs(ps) do
   if v.lt < os.time()-1 then
    for l,m in ipairs(net.tm) do
     m.broadcast(net.np,"copper",cdlib.encode(0,net.id,v.nid,relib.encode(v)))
    end
    v.at = v.at + 1
    v.lt = os.time()
    if v.pt == 2 then ps[k] = nil end
   end
   if v.at > 255 then
    ps[k] = nil
   end
  end
  local cot = os.time()
  for k,v in pairs(pt) do
   if v < cot-16 then
    pt[k] = nil
   end
  end
 end
end)) end)
end