Kconfig selection error in lwm2m client project

[barely_metal]

I am working on adding a new LWM2M object (3302 Presence) to the lwm2m client project from SDK version 1.9.1. After creating and including the file "Kconfig.ipso_presence_sensor" which is located in the ipso folder, I now receive the below build errors:

warning: the default selection LWM2M_IPSO_PRESENCE_VERSION_1_0 (defined at C:\code\TWPS\src\ipso\Kconfig.ipso_presence_sensor:24, c:\code\TWPS\build\subsys\net\lib\lwm2m\Kconfig.ipso:310) of <choice> (defined at C:\code\TWPS\src\ipso\Kconfig.ipso_presence_sensor:20) is not contained in the choice

warning: the choice symbol LWM2M_IPSO_PRESENCE_VERSION_1_0 (defined at C:\code\TWPS\src\ipso\Kconfig.ipso_presence_sensor:24, c:\code\TWPS\build\subsys\net\lib\lwm2m\Kconfig.ipso:310) is defined with a prompt outside the choice

warning: the choice symbol LWM2M_IPSO_PRESENCE_VERSION_1_1 (defined at C:\code\TWPS\src\ipso\Kconfig.ipso_presence_sensor:27, c:\code\TWPS\build\subsys\net\lib\lwm2m\Kconfig.ipso:313) is defined with a prompt outside the choice

warning: the choice symbol LWM2M_IPSO_PRESENCE_VERSION_1_0 (defined at C:\code\TWPS\src\ipso\Kconfig.ipso_presence_sensor:24, c:\code\TWPS\build\subsys\net\lib\lwm2m\Kconfig.ipso:310) is defined with a prompt outside the choice

warning: the choice symbol LWM2M_IPSO_Parsing C:/code/TWPS/Kconfig
Loaded configuration 'C:/code/TWPS/build/zephyr/.config'
PRESENCE_VERSION_1_1 (defined at C:\code\TWPS\src\ipso\Kconfig.ipso_presence_sensor:27, c:\code\TWPS\build\subsys\net\lib\lwm2m\Kconfig.ipso:313) is defined with a prompt outside the choice

error: Aborting due to Kconfig warnings

Here is the file code:

#

# Copyright (c) 2021 Nordic Semiconductor ASA

#

# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause

#

config LWM2M_APP_PRESENCE

    bool

    help

      This IPSO object should be used to report detected presence

if LWM2M_APP_PRESENCE

config LWM2M_IPSO_PRESENCE_INSTANCE_COUNT

    int

    default 3

    help

      Total count of IPSO Presence instances available to the LWM2M client.

choice

    prompt "Select IPSO Presence object version"

    default LWM2M_IPSO_PRESENCE_VERSION_1_0

config LWM2M_IPSO_PRESENCE_VERSION_1_0

    bool "Version 1.0"

config LWM2M_IPSO_PRESENCE_VERSION_1_1

    bool "Version 1.1"

endchoice # IPSO Presence object version

endif # LWM2M_APP_PRESENCE

I am not sure why I am receiving this error since the file contents are formatted exactly like the file Kconfig.ipso_colour_sensor which is located in the same folder.

[barely_metal]

I found the solution to this issue. Below is an extract from another Zephyr forum but I have changed the file references to match my situation:

--------------------------------------------------------------------------------------------------------------------------------------

"What I notice, is this:

warning: the choice symbol LWM2M_IPSO_PRESENCE_VERSION_1_0 (defined at C:\code\TWPS\src\ipso\Kconfig.ipso_presence_sensor:24, c:\code\TWPS\build\subsys\net\lib\lwm2m\Kconfig.ipso:310) is defined with a prompt outside the choice

Those two:

Defined at
 C:\code\TWPS\src\ipso\Kconfig.ipso_presence_sensor:24
 c:\code\TWPS\build\subsys\net\lib\lwm2m\Kconfig.ipso:310

indicates that the SAME Kconfig file is sourced twice from different locations.
Note, that when you have:

- name: nrf
  repo-path: sdk-nrf
  path: nrf
  revision: v1.3.0
  remote: ncs   

in your manifest, then the nrf/Kconfig.nrf is automatically included by the build system, so if you ALSO do something similar to:
source "<path>/nrf/Kconfig.nrf" inside your own project, then you could end up with the same Kconfig files sourced twice, and leading to undefined behaviour."

--------------------------------------------------------------------------------------------------------------------------------------

I had the following code in the main project Kconfig file:

if APP_PRESENCE

    rsource "src/ipso/Kconfig.ipso_presence_sensor"

endif # APP_PRESENCE

Once I removed these lines from the main project Kconfig file, the compile warnings went away and the symbols defined correctly.