Getting errors with nRF Connect sample project 'SMP Server Sample'

Question

My environment: 
 nRF Connect version 2.1.0 Board: nrf52840 DK Host: MacOS 12.6 
 Trying to use the Zephyr sample project called SMP Server Sample. The instructions are here: 
 http://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.1.0/zephyr/samples/subsys/mgmt/mcumgr/smp_svr/README.html 
 The project path is here: 
 /opt/nordic/ncs/v2.1.0/zephyr/samples/subsys/mgmt/mcumgr/smp_svr 
 These steps worked without error: 
 
 Build bootloader 
 flash bootloader 
 Build sample application 
 
 When I try to sign the sample application I get an error. 
 (base) √ smp_svr % west sign -t imgtool -- --key ../../../../../../bootloader/mcuboot/root-rsa-2048.pem 
=== image configuration:
partition offset: 49152 (0xc000)
partition size: 421888 (0x67000)
rom start offset: 0 (0x0)
=== signing binaries
unsigned bin: /opt/nordic/ncs/v2.1.0/zephyr/samples/subsys/mgmt/mcumgr/smp_svr/build/zephyr/zephyr.bin
signed bin: /opt/nordic/ncs/v2.1.0/zephyr/samples/subsys/mgmt/mcumgr/smp_svr/build/zephyr/zephyr.signed.bin
Usage: imgtool sign [OPTIONS] INFILE OUTFILE

Error: Invalid value for '-H' / '--header-size': Minimum value for -H/--header-size is 32
FATAL ERROR: command exited with status 2: /opt/nordic/ncs/toolchains/v2.1.0/bin/imgtool sign --version 0.0.0+0 --align 4 --header-size 0 --slot-size 421888 --key ../../../../../../bootloader/mcuboot/root-rsa-2048.pem /opt/nordic/ncs/v2.1.0/zephyr/samples/subsys/mgmt/mcumgr/smp_svr/build/zephyr/zephyr.bin /opt/nordic/ncs/v2.1.0/zephyr/samples/subsys/mgmt/mcumgr/smp_svr/build/zephyr/zephyr.signed.bin
(base) ?2 smp_svr % pwd
/opt/nordic/ncs/v2.1.0/zephyr/samples/subsys/mgmt/mcumgr/smp_svr
 
 When I read the help for imgtool I found this: 
 
 The image header size, alignment, and slot sizes are determined from
the build directory using .config and the device tree. A default
version number of 0.0.0+0 is used (which can be overridden by passing
"--version x.y.z+w" after "--key"). As shown above, extra arguments
after a '--' are passed to imgtool directly. 
 Not sure how to fix the problem.

Raoul · Accepted Answer

Hi Michael, 
 Thanks for waiting. 
 First of all, NCS is set up to automatically generate signed images when you enable MCUboot: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/mcuboot/readme-ncs.html 
 In this list of generated files , "app_signed.hex" and "app_update.bin" are the signed images meant for DFU. They can be found in your build folder. 
 So even though the SMP Server sample readme says so, there is no need to sign manually. Sorry for the confusion, this sample and its readme are pulled in from the Zephyr repository. 
 If you do want to sign things manually, it seems that you have to explicitly set the header size and align it, using --header-size 32 --pad-header 
 So the full command becomes: 
 west sign -t imgtool -- --key C:
cs\v2.1.0\bootloader\mcubootoot-rsa-2048.pem --header-size 32 --pad-header 
 This successfully signs the image on my machine. 
 Hope that helps! 
 Best regards, 
 Raoul Pathak

Getting errors with nRF Connect sample project 'SMP Server Sample'

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