Release v0.21.0

Signed-off-by: Sam Friedman <[email protected]>

Author: sam-golioth

CHANGELOG.md

@@ -4,6 +4,38 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+
+## [0.21.0] 2025-10-08
+
+### Breaking Changes
+- The function for subscribing to changes to the OTA manifest has
+  been renamed from `golioth_ota_observe_manifest_async()` to
+  `golioth_ota_manifest_subscribe()`. This name change reflects the
+  new subscription behavior described below. Applications using
+  Golioth's reference firmware update implementation do not require
+  any changes.
+- Applications which use Golioth's sample library for storing WiFi
+  credentials will need to maintain that functionality themselves
+  going forward or migrate to Zephyr's WiFi Credentials library
+  (see below).
+
+### Added
+
+- The OTA service now periodically polls for updates to the OTA
+  manifest, in addition to using CoAP observations to receive
+  asynchronous notifications of changes to the manifest. The
+  polling period defaults to 1 day and is configurable using
+  `CONFIG_GOLIOTH_OTA_MANIFEST_SUBSCRITION_POLL_INTERVAL_S`.
+
+### Changed
+
+- Zephyr samples use Zephyr's native WiFi Credentials library for
+  storing WiFi network information, instead of the previous custom
+  solution. This provides greater flexibility in the selection of
+  WiFi security and storage backend options.
+- Zephyr support has been upgraded to v4.2.1.
+- nRF Connect SDK support has been upgraded to v3.1.1.
+
 ## [0.20.0] 2025-08-25
 
 ### Added

README.md

@@ -32,7 +32,7 @@ API documentation: https://firmware-sdk-docs.golioth.io/
 This repo uses git submodules, so you will need to clone with the `--recursive` option:
 
 ```sh
-git clone --recursive https://github.com/golioth/golioth-firmware-sdk.git -b v0.20.0
+git clone --recursive https://github.com/golioth/golioth-firmware-sdk.git -b v0.21.0
 ```
 
 Or, if you've already cloned but forgot the `--recursive`, you can update and

VERSION.txt

@@ -1 +1 @@
-0.20.0
+0.21.0

examples/zephyr/README.md

@@ -27,7 +27,7 @@ Execute this command to download this repository together with all
 dependencies:
 
 ```console
-west init -m https://github.com/golioth/golioth-firmware-sdk.git --mr v0.20.0 --mf west-zephyr.yml
+west init -m https://github.com/golioth/golioth-firmware-sdk.git --mr v0.21.0 --mf west-zephyr.yml
 west update
 cd modules/lib/golioth-firmware-sdk && git submodule update --init --recursive
 ```
@@ -42,7 +42,7 @@ Execute this command to download this repository together with all
 dependencies:
 
 ```console
-west init -m https://github.com/golioth/golioth-firmware-sdk.git --mr v0.20.0 --mf west-ncs.yml
+west init -m https://github.com/golioth/golioth-firmware-sdk.git --mr v0.21.0 --mf west-ncs.yml
 west update
 cd modules/lib/golioth-firmware-sdk && git submodule update --init --recursive
 ```
@@ -62,7 +62,7 @@ based project (e.g. Zephyr RTOS):
 # Golioth repository.
 - name: golioth
   path: modules/lib/golioth-firmware-sdk
-  revision: v0.20.0
+  revision: v0.21.0
   url: https://github.com/golioth/golioth-firmware-sdk.git
   submodules: true
 ```