How does ConnMan works with Ofono? RE: [PATCH */4] add interface property to primary context

[Xu, Martin]

Hi Marcel/Denis
In order to implement interface property. I think we need to clarify how does ConnMan work with Ofono firstly

In my opinion ConnMan and ofono works like below. Could you review and give out your opinions? Thanks!

PC_i: PrimaryContext_(internet type):
______________________________________
Ofono                         ConnMan
------------------------------------------------------------------

1.Modem                    device
  |
  | (create/load)
  |
  V
2.PC_i                     Network
  |
  |(powered up)
  |
  V
3.Attached PC_i----------->    Service (ready)
                         |
                         |(connect)
                         |
                         V 
4.Activated PC_i           Service (associated)
                         |
                         |(configure/dhcp)
                         |
                         V
5.                       Service (READY)

1. ConnMan detects the Modem from Ofono and create corresponding device
2. ConnMan detects the PC_i and create corresponding Network(First time, ConnMan will ask Ofono to create PC_i)
3. Once the PC_i attached ConnMan will create service
4. When user connects service, ConnMan will ask ofono to activate PC_i.
   When PC_i is activated, Service in ConnMan is associated.
5. ConnMan will configure/dhcp to ipconfigure the service, and then service in READY state