netwerkprinter protocol

serialize this structure:

dataroot = {
  packetid:string
  type:int
  cmd:string
  data:various
}

1. init connection
packetid: new packetid
type: 1
cmd: nil
data: nil

2. send printer command
packetid: same you used for init
type: 3
cmd: printercommand to execute
data: table which has the params for the command

3. start actual printing:
packedid: you guessed it, same you used for init
type: 2
cmd: nil
data: nil

every command should return the result(type = 5: error, type=6: success)
use timout for rednet.read() though