title: Automotive: For what purpose ISO-TP Extended Addressing is used?
body: <p>I've read through all ISO documents and can't figure out in which cases we need extended addressing in ISO-TP, though I've seen packets from BMW CAN traffic where UDS uses extended addressing.</p>
  
  <p>Why does ISO-TP protocol need to specify target address if all nodes do the filtering by CAN ID? Is it possible that nodes will also filter packed by ISO-TP target address?</p>
  
  <p>Any ideas?</p>