Flow/Server based 1-1 chat state

= Server based 1-1 chat state =

(or: persistent 1-1 chats involving multiple clients of one user)

Toolkit:


 * 1) MAM
 * 2) MR2 (or Carbons)
 * 3) MID

Findings


 * 1) XMPP-IM (RFC 6121 8.) Message routing is not useful for the goal
 * 2) Clients are able to determine the MAM ID before the send the message

Sketch
Romeo and Julia want to talk. They both have multiple clients (desktop, mobile device, etc).


 * If Romeo sends a message to Julia, the message is forked to all other clients of Romeo, and to all clients of Julia
 * When the message arrives at Julia clients, it will contain the MAM ID under which it was stored in Julia's MAM Archive
 * Romeo is able to calculate the MAM ID under which the message was stored in his MAM Archive, by concatenating the Message ID with the Stream ID (or another suitable ID told to Romeo's client).
 * Those two MAM IDs are not identical. Romeo and Julia store the same message in their MAM Archive under different IDs