BC

if fs.exists("bcapi") == false then
  shell.run("pastebin get XZJfiqnH bcapi")
end

os.loadAPI("bcapi")

function broadcast(str, side)
   local enc = bcapi.encode(str)

   bcapi.send(enc, side)
end

function receive(side)
   local ret = {}
   while true do
     local event, p1 = os.pullEvent()
     if event == "redstone" then
       bcapi.decode(rs.getBundledInput(side))

     elseif event == "BCAPI_start" then
       ret.id = p1
       ret.tmsg = {}

     elseif event == "BCAPI_byte" then
       ret.tmsg[#ret.tmsg+1] = p1

     elseif event == "BCAPI_end" then
       ret.msg = string.char(unpack(ret.tmsg))
       break
     end
   end

   return ret.id, ret.msg
end