net = {}
net.id = computer.address():sub(1,8)
net.np = 4957
net.cache = true
net.cache_time = 16
net.log = false
net.tm = {}
if not component.list("ocemu")() then
 net.cache = true
end
function net.send(id,po,msg) -- id, port, message
 if id and po and msg then
  event.push("sendmsg",id,po,msg)
 else return false
 end
end
if cdlib and relib then
spawn("copperd",function() print(xpcall(function ()
 local pt = {}
 local ps = {}
 local fcache = {}
 local olog = log
 local function log(...)
  if net.log then
   olog(...)
  end
 end
 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)] = computer.uptime()
   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 hops and src and dst and data then
    if not fcache[src] then
     log("fcache["..tostring(src).."] = "..tostring(ev[3]))
     fcache[src] = {ev[2],ev[3],computer.uptime()}
    end
    if not pt[ev[7]:sub(2)] then
     pt[ev[7]:sub(2)] = computer.uptime()
     if dst == net.id then
      event.push("net_rmsg",src,data)
      local pd = relib.decode(data)
      if pd then
       if pd.port and pd.pid and pd.at and pd.pt 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
	 log("[copperd] sent ack to "..src)
        elseif pd.pt == 2 then
	 log("[copperd] received ack from "..src.." for "..pd.pid)
         ps[pd.pid] = nil
        end
       end
      end
     else
      if hops < 255 then
       if fcache[dst] and net.cache then
        component.invoke(fcache[dst][1],"send",fcache[dst][2],net.np,"copper",cdlib.encode(hops+1,src,dst,data))
       else
        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
   end
  end
  for k,v in pairs(ps) do
   if v.lt < computer.uptime()-1 then
    if fcache[v.nid] and net.cache then
     local lma = fcache[v.nid][1]
     local rma = fcache[v.nid][2]
     component.invoke(lma,"send",rma,net.np,"copper",cdlib.encode(0,net.id,v.nid,relib.encode(v)))
    else
     for l,m in ipairs(net.tm) do
      m.broadcast(net.np,"copper",cdlib.encode(0,net.id,v.nid,relib.encode(v)))
     end
    end
    v.at = v.at + 1
    v.lt = computer.uptime()
    if v.pt == 2 then ps[k] = nil end
   end
   if v.at > 255 then
    ps[k] = nil
   end
  end
  local cot = computer.uptime()
  for k,v in pairs(pt) do
   if v < cot-16 then
    pt[k] = nil
   end
  end
  for k,v in pairs(fcache) do
   if v[3] < cot - net.cache_time then
    log(k.." derezzed")
    fcache[k] = nil
   end
  end
 end
end)) end)
end