How to extend mesh light_switch example with DFU

Question

I am using the Mesh-SDK v1.0.0, the device is the nRF52832xxAA on PCA10040-Boards with the Softdevice s132. I am new to the development with BLE, and specially mesh.
I have successfully done the DFU example, the application won't work, but the DFU looks like it was ok.
Now my qestion: 
 
 How could I extend the light_switch example to be DFU-ready? (primary target) 
 Why is the example binary (app_green_s132.hex), which was a part of the DFU exmaple not working? (The board just stops working after the DFU) Is there any sourcecode for this application? Is inside the app_green.hex a build in DFU-functionality, to upgrade this app to a new version? 
 Somwhere in the documentation stands, that the DFU functionality from the bootloader will be used for the application, how many space is needed in addition to lets say the light_switch-application to implement the DFU functionality? (I tried to update the DFU example with the examlpe itself, but the firmware looked to be too big, i've got a error message at the start of the download "Abort event. Reason: 0xD"). 
 Is there some documentation about the porting of the DFU functionality inside a mesh-application? Or the usage of the bootloader DFU inside the mesh-pplication code?

Bjørn Kvaale · Answer

Hi Roland, 
 After a successful DFU, the application should start automatically, so I don't think your DFU was successful unfortunately. 
 Question 1: I would firstly get the DFU example to work. Then, I would take a look at the light switch source code (client & server) & compare this with the DFU source code.You can make a copy of the light switch example folder (under mesh_sdk/examples/) & call it light_switch_dfu for example. Then, try to add the DFU functionality into this new example by adding the functionality available in the DFU example that is not available in the light switch example. It will most likely help to really understand all of the code and all of the steps needed to setup a mesh network. 
 Question 2: Taking a look at the DFU quick start guide , it seems they use the blinky example instead. Could you try running the DFU with this example & follow the steps in the DFU quick start guide & see if that works? 
 Question 3: Are you referring to this ? 
 Question 4: It might be helpful to have a look at this link & use the Secure DFU application in the normal Nordic SDK. Also, take a look at the DFU quick start guide I mentioned in Question 2 & maybe this blog post will help . 
 
 Hope that helps!