Anjay 3.8.1

Improvements
- Improved the coverage script and switched to lcov.
- In case when the LwM2M server answers with an RST message to a notification
  that is yielding an error value (e.g. failure to read), which effectively
  cancels the notification, Anjay is not infinitely trying to transmit that
  message with error value once again. New behavior is enabled by default, and
  controlled with `WITH_AVS_COAP_OBSERVE_FORCE_CANCEL_ON_UNACKED_ERROR` option
  of `avs_coap`. Existing projects have to opt-in explicitly.
- Added `--nobest` flag to `dnf update` in Rockylinux image preparation for
  tests to solve installation candidates conflicts.

 Bugfixes
- Actually fixed compatibility with Mbed TLS 3.6.
- Fixed compatibility of integration test framework with Mbed TLS versions that
  enabled TLS 1.3, but didn't use `MBEDTLS_USE_PSA_CRYPTO`.
- The -Wformat warning appearing in some compilers has been fixed.
- Fixed LwM2M CBOR parser incorrectly accepting inputs containing empty arrays
  as keys
- Prevent from generating non unique session tokens when the monotonic system
  clock granulation is not fine enough.
- Refactored how timeouts are handled in pymbedtls to be in line with use of
  mbedTLS in avs_commons.

.github/workflows/anjay-tests.yml

@@ -121,7 +121,7 @@ jobs:
       - uses: actions/checkout@v1
         with:
           submodules: recursive
-      - run: dnf update -y
+      - run: dnf update -y --nobest
       - run: dnf install -y $CC
       # Solve issues with EPERM when running dumpcap
       - run: setcap '' $(which dumpcap)
@@ -149,9 +149,13 @@ jobs:
         with:
           submodules: recursive
       - run: brew update
-      # NOTE: latest known compatible versions are [email protected] and mbedtls--3.4.0
       # NOTE: try the brew install command twice to work around "brew link" errors
-      - run: INSTALL_CMD="brew install openssl mbedtls $COMPILER_VERSION"; $INSTALL_CMD || $INSTALL_CMD
+      - run: INSTALL_CMD="brew install openssl $COMPILER_VERSION"; $INSTALL_CMD || $INSTALL_CMD
+      # NOTE: Some tests don't pass on mbedTLS 3.6.2 now, so we need to install an older version
+      #       Homebrew only specifiers major version of mbedTLS, so let's pin the version to 3.6.0 manually
+      - run: curl -f https://raw.githubusercontent.com/Homebrew/homebrew-core/219dabf6cab172fb8b62b4d8598e016e190c3c20/Formula/m/mbedtls.rb > /tmp/mbedtls.rb
+      - run: brew install --formula /tmp/mbedtls.rb
+      - run: brew pin mbedtls
       # NOTE: The above command may have installed a new version of Python, that's why we launch it weirdly
       - run: /usr/bin/env python3 -m pip install -r requirements.txt
       - run: env JAVA_HOME="$JAVA_HOME_17_X64" ./devconfig --with-asan --without-analysis --no-examples -DWITH_VALGRIND_TRACK_ORIGINS=OFF -DWITH_URL_CHECK=OFF -DWITH_IPV6=OFF

.gitignore

@@ -15,6 +15,7 @@ nbproject
 
 # build configuration autogenerated files
 /build
+/coverage
 /output
 *.swp
 CMakeFiles/

CHANGELOG.md

@@ -1,5 +1,32 @@
 # Changelog
 
+## 3.8.1 (November 13th, 2024)
+
+### Improvements
+
+- Improved the coverage script and switched to lcov.
+- In case when the LwM2M server answers with an RST message to a notification
+  that is yielding an error value (e.g. failure to read), which effectively
+  cancels the notification, Anjay is not infinitely trying to transmit that
+  message with error value once again. New behavior is enabled by default, and
+  controlled with `WITH_AVS_COAP_OBSERVE_FORCE_CANCEL_ON_UNACKED_ERROR` option
+  of `avs_coap`. Existing projects have to opt-in explicitly.
+- Added `--nobest` flag to `dnf update` in Rockylinux image preparation for
+  tests to solve installation candidates conflicts.
+
+### Bugfixes
+
+- Actually fixed compatibility with Mbed TLS 3.6.
+- Fixed compatibility of integration test framework with Mbed TLS versions that
+  enabled TLS 1.3, but didn't use `MBEDTLS_USE_PSA_CRYPTO`.
+- The -Wformat warning appearing in some compilers has been fixed.
+- Fixed LwM2M CBOR parser incorrectly accepting inputs containing empty arrays
+  as keys
+- Prevent from generating non unique session tokens when the monotonic system
+  clock granulation is not fine enough.
+- Refactored how timeouts are handled in pymbedtls to be in line with use of
+  mbedTLS in avs_commons.
+
 ## 3.8.0 (May 28th, 2024)
 
 ### BREAKING CHANGES

CMakeLists.txt

@@ -8,7 +8,7 @@
 cmake_minimum_required(VERSION 3.6.0)
 
 project(anjay C)
-set(ANJAY_VERSION "3.8.0" CACHE STRING "Anjay library version")
+set(ANJAY_VERSION "3.8.1" CACHE STRING "Anjay library version")
 set(ANJAY_BINARY_VERSION 1.0.0)
 
 set(ANJAY_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}")
@@ -433,6 +433,8 @@ add_library(anjay
             src/core/io/anjay_cbor_out.c
             src/core/io/anjay_common.c
             src/core/io/anjay_common.h
+            src/core/io/anjay_corelnk.c
+            src/core/io/anjay_corelnk.h
             src/core/io/anjay_dynamic.c
             src/core/io/anjay_input_buf.c
             src/core/io/anjay_json_encoder.c
@@ -617,7 +619,7 @@ if(WITH_TEST)
     add_custom_target(check)
     add_custom_target(anjay_unit_check)
     add_dependencies(check anjay_unit_check)
-
+    
     # anjay_test
     add_executable(anjay_test EXCLUDE_FROM_ALL
                    $<TARGET_PROPERTY:anjay,SOURCES>

README.md

@@ -179,7 +179,7 @@ pip3 install -U -r requirements.txt
 
 ### Running the demo client
 
-For initial development and testing of LwM2M clients, we recommend using the [Coiote IoT Device Management](https://www.avsystem.com/products/coiote-iot-device-management-platform/) where you can use the basic LwM2M server functionality for free.
+For initial development and testing of LwM2M clients, we recommend using the [Coiote IoT Device Management](https://avsystem.com/coiote-iot-device-management-platform/) where you can use the basic LwM2M server functionality for free.
 
 After setting up an account and adding the device entry, you can compile Anjay demo client and connect it to the platform by running:
 
@@ -322,11 +322,11 @@ See [LICENSE](LICENSE) file.
 
 ### Commercial support
 
-Anjay LwM2M library comes with the option of [full commercial support, provided by AVSystem](https://www.avsystem.com/products/anjay/).
+Anjay LwM2M library comes with the option of [full commercial support, provided by AVSystem](https://avsystem.com/anjay-iot-sdk/).
 
 The list of features available commercially is [available here](https://AVSystem.github.io/Anjay-doc/CommercialFeatures.html).
 
-If you're interested in LwM2M Server, be sure to check out the [Coiote IoT Device Management](https://www.avsystem.com/products/coiote-iot-dm/) platform by AVSystem. It also includes the [interoperability test module](https://www.avsystem.com/lwm2m-interoperability-test/) that you can use to test your LwM2M client implementation. Our automated tests and testing scenarios enable you to quickly check how interoperable your device is with LwM2M.
+If you're interested in LwM2M Server, be sure to check out the [Coiote IoT Device Management](https://www.avsystem.com/products/coiote-iot-dm/) platform by AVSystem. It also includes the [interoperability test module](https://avsystem.com/coiote-iot-device-management-platform/lwm2m-interoperability-test/) that you can use to test your LwM2M client implementation. Our automated tests and testing scenarios enable you to quickly check how interoperable your device is with LwM2M.
 
 ## Contributing
 

demo/CMakeLists.txt

@@ -40,6 +40,7 @@ if (${ANJAY_WITH_MODULE_FW_UPDATE})
     set(SOURCES ${SOURCES} firmware_update.c)
 endif()
 
+
 if (${ANJAY_WITH_MODULE_ADVANCED_FW_UPDATE})
     set(SOURCES ${SOURCES}
                 advanced_firmware_update.c
@@ -52,6 +53,7 @@ if (${ANJAY_WITH_MODULE_SW_MGMT})
     set(SOURCES ${SOURCES} software_mgmt.c)
 endif()
 
+
 if(NOT WIN32)
     set(SOURCES ${SOURCES} objects/ip_ping.c)
 endif()

deps/avs_coap/.gitignore

@@ -36,6 +36,7 @@ _CPack_Packages/
 Testing/
 /cmake/avs_coap-config.cmake
 /build*
+/coverage/
 /examples/build
 /include_public/avsystem/coap/avs_coap_config.h
 /tools/__pycache__

deps/avs_coap/CMakeLists.txt

@@ -38,6 +38,7 @@ option(WITH_AVS_COAP_TCP "Enable CoAP over TCP support" ON)
 option(WITH_AVS_COAP_STREAMING_API "Enable streaming API" ON)
 option(WITH_AVS_COAP_OBSERVE "Enable support for observations" ON)
 option(WITH_AVS_COAP_OBSERVE_CANCEL_ON_TIMEOUT "Turn on cancelling observation on a timeout " OFF)
+option(WITH_AVS_COAP_OBSERVE_FORCE_CANCEL_ON_UNACKED_ERROR "Force cancelling observation on unacked error" ON)
 cmake_dependent_option(WITH_AVS_COAP_OBSERVE_PERSISTENCE "Enable observations persistence" ON "WITH_AVS_COAP_OBSERVE" OFF)
 option(WITH_AVS_COAP_BLOCK "Enable support for BLOCK/BERT transfers" ON)
 

deps/avs_coap/include_public/avsystem/coap/avs_coap_config.h.in

@@ -80,6 +80,18 @@
  */
 #cmakedefine WITH_AVS_COAP_OBSERVE_CANCEL_ON_TIMEOUT
 
+/**
+ * Force cancelling observation, even if a confirmable notification yielding
+ * an error response is not acknowledged or rejected with RST by the observer.
+ *
+ * This is a circumvention for some non-compliant servers that respond with an
+ * RST message to a confirmable notification yielding an error response. This
+ * setting makes the library cancel the observation in such cases, even though
+ * the notification is formally rejected. Additionally, it will also make the
+ * library cancel the observation if no response is received at all.
+ */
+#cmakedefine WITH_AVS_COAP_OBSERVE_FORCE_CANCEL_ON_UNACKED_ERROR
+
 /**
  * Enable support for observation persistence (<c>avs_coap_observe_persist()</c>
  * and <c>avs_coap_observe_restore()</c> calls).

deps/avs_coap/src/async/avs_coap_async_server.c

@@ -307,7 +307,19 @@ send_result_handler(avs_coap_ctx_t *ctx,
 
     server->delivery_handler(ctx, fail_err, server->delivery_handler_arg);
 
-    if (avs_is_ok(fail_err)) {
+    bool is_timeout = fail_err.category == AVS_COAP_ERR_CATEGORY
+                      && fail_err.code == AVS_COAP_ERR_TIMEOUT;
+    bool is_rst = fail_err.category == AVS_COAP_ERR_CATEGORY
+                  && fail_err.code == AVS_COAP_ERR_UDP_RESET_RECEIVED;
+    (void) is_timeout;
+    (void) is_rst;
+
+    bool do_cancel_on_error = avs_is_ok(fail_err);
+#ifdef WITH_AVS_COAP_OBSERVE_FORCE_CANCEL_ON_UNACKED_ERROR
+    do_cancel_on_error = do_cancel_on_error || is_timeout || is_rst;
+#endif // WITH_AVS_COAP_OBSERVE_FORCE_CANCEL_ON_UNACKED_ERROR
+
+    if (do_cancel_on_error) {
         cancel_notification_on_error(ctx,
                                      (avs_coap_observe_id_t) {
                                          .token = token
@@ -316,8 +328,7 @@ send_result_handler(avs_coap_ctx_t *ctx,
     }
 #if defined(WITH_AVS_COAP_OBSERVE) \
         && defined(WITH_AVS_COAP_OBSERVE_CANCEL_ON_TIMEOUT)
-    else if (fail_err.category == AVS_COAP_ERR_CATEGORY
-             && fail_err.code == AVS_COAP_ERR_TIMEOUT) {
+    else if (is_timeout) {
         avs_coap_observe_cancel(ctx, (avs_coap_observe_id_t) {
                                          .token = token
                                      });
@@ -1334,6 +1345,19 @@ avs_coap_notify_async(avs_coap_ctx_t *ctx,
         avs_errno(AVS_EINVAL);
     }
 
+    // FIXME: Unsolicited non-confirmable notifications with an error code are
+    // currently broken, because of lack of the Observe option for error values,
+    // the lower, UDP layer assumes the message to be an ACK, not a NON.
+    //
+    // For reference, see assumptions in choose_msg_type() in avs_coap_udp_ctx.c
+    if (reliability_hint == AVS_COAP_NOTIFY_PREFER_NON_CONFIRMABLE
+            && !avs_coap_code_is_success(response_header->code)) {
+        LOG(ERROR,
+            _("Unsolicited notifications with an error code are currently "
+              "broken"));
+        return avs_errno(AVS_EINVAL);
+    }
+
     avs_coap_observe_notify_t notify;
 
     avs_error_t err = _avs_coap_observe_setup_notify(ctx, &observe_id, &notify);

deps/avs_coap/src/tcp/avs_coap_tcp_ctx.c

@@ -7,6 +7,8 @@
  * See the attached LICENSE file for details.
  */
 
+#include <inttypes.h>
+
 #include <avs_coap_init.h>
 
 #ifdef WITH_AVS_COAP_TCP
@@ -59,7 +61,8 @@ static void log_tcp_msg_summary(const char *info,
 #    ifdef WITH_AVS_COAP_OBSERVE
     uint32_t observe;
     if (avs_coap_options_get_observe(&msg->options, &observe) == 0) {
-        snprintf(observe_str, sizeof(observe_str), ", Observe %u", observe);
+        snprintf(observe_str, sizeof(observe_str), ", Observe %" PRIu32,
+                 observe);
     }
 #    endif // WITH_AVS_COAP_OBSERVE