FOTA with Nordic Connect SDK (ncs) not working

Question

I'm blocked trying to get an Nrf52 application developed under v1.3.0 SDK work with FOTA. 
 My application is working fine. FYI, its on custom hardware derived from nrf52832_mdk board definition, and the lbs sample. 
 
 Now to add FOTA capability. No buttons or display, so buttonless. 
 
 I followed the instructions from here, 
 https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/ug_nrf52.html?highlight=fota#fota-upgrades 
 and I end up with an application that has the DFU characteristic advertised, and nrf connect for mobile and connects to, for DFU. I rebuild an application and try to upload it via NRF Connect, and after a short time of "validating app" on the screen, it reverts back with no error message. 
 Goggling suggests there is some bug with page alignment fixed mid last year. So I try to copy my application to SDK v1.4.2, and I get a raft of build errors, which cannot be navigated to easily in the IDE. Even the previously supported types like u8_t are no longer valid! 
 Does anyone have any suggestions? I've used buttonless FOTA on a product on the previous NRF5 SDK with no issues, I'd rather not abandon this mess and go back.

Einar Thorsrud · Accepted Answer

Hi Mike, 
 Thank you. This is puzzling, to be honest. Would it be possible to provide your example that reproduce this on a DK, with instructions on how to reproduce? That way I can debug on my side as well. You can create a private ticket and refer to this one if you do not want to share the code in public. 
 Mike Hibbett said: Can you provide me with an existing example of creating a FOTA build, based on the nrf52832? I presume this has been tested. I could then use that as the basis for working out my own settings. 
 Regarding the question about an existing FOTA example that is present in the nRF Connect SDK. I understand you are using NCS 1.3.0, and I just verified that the example works there. You can use it like this: 
 
 Navigate to zephyr\samples\subsys\mgmt\mcumgr\smp_svr\ (using NCS 1.3.0 in this case, but method is same for newer versions) 
 Build with west build -b nrf52dk_nrf52832 . -- -DOVERLAY_CONFIG=overlay-bt.conf 
 Program build/zephyr/merged.hex from the first build. This way you have MCUboot and the application which has smp_svr and bluetooth transport on it. 
 (Open a UART PuTTY terminal to the nRF so that you can observe the log) 
 Build the example again to get a different app binary (build time stamp is part of the app due to logging it) 
 Copy build/zephyr/app_update.bin to your phone (call it something like first_app_update.bin to be able to distinguish it) 
 Program the .bin from via DFU (I use nRF Connect for iOS but nRF Connect for Android should do the same) 
 Observe from logs that it works 
 Go back to step 5 and to this again, observe that second DFU upgrade also works. 
 
 Einar

FOTA with Nordic Connect SDK (ncs) not working

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