outline.txt

C = Client
H = Handshake
lguid = Last Guid
l8r = Later Rows
aR: android
iS: apple


           --------
          /        \
 ------- | Server | ------- C
          \        /
           --------
  _           ||           _
  |-----H---->||<----H---- |
  |           ||           |
db|<--lguid---||<--lguid---|something else
  |           ||           |
  |----l8r--->db----l8r--->|
  X                        X

Serv:
  -->
  | check for connections
  | thread
  |-|| Handshake
  |-|| Get device info
  |-|| if iS:
  |-||-||| send last guuid
  |-||-||| -->
  |-||-|||=| receive rows(1 per conn)
  |-||-|||=| on exit signal; break
  |-||-|||=|-------------------------
  |-||-||| send confirm exit signal
  |-|| if aR:
  |-||-||| receive guuid
  |-||-||| -->
  |-||-|||=| send rows(1 per conn)
  |-||-|||=| at end of db; break
  |-||-|||=|--------------------------
  |-||-||| send exit signal ### We wroted something different but im not sure about that
  |-||-||| receive exit signal
  |-------------------------------------------

:
  -->When get message:
  | Send handshake
  | Receive latest guid
  | -->
  |=| Send next row (starting with after guid)
  |=| @ end; break
  |=|-----------------------------------------
  | Send exit
  | Receive exit
  |----------------------

C:
  -->Every "so often":
  | Send handshake
  | Send latest guid
  | Receive message row(one per conn)
  | Send exit
  | Receive exit
  |------------------------------------