11.14. Migrating from Anjay 3.10

11.14.1. Introduction

Starting from Anjay 3.11.0, the behavior regarding the maximum Hold Off Time for bootstrap connections has changed.

11.14.2. Limiting the maximum Hold Off Time for Bootstrap

A limit has been introduced on the maximum Hold Off Time (LwM2M Security Object, Resource ID: 11) to avoid excessive delays when initiating the Bootstrap process. Previously, the upper bound was implicitly 120 seconds, but it is now explicitly limited to 20 seconds by default.

This behavior can be customized at build time using the MAX_HOLDOFF_TIME macro.

11.14.3. Handling of Trust Store for certain Certificate Usages settings

avs_commons 5.5.0 that is used by Anjay 3.11.0 does not pass the configured Trust Store (whether manually provided or acquired through the EST process) to Mbed TLS when the certificate usage is set to DANE-TA or DANE-EE, if the Data Model already contains a Server certificate intended for verifying the Server during a secure connection.

If the Server certificate is missing from the Data Model, Anjay falls back to PKIX verification, provided that a Trust Store is available, even when the certificate usage is set to DANE-TA or DANE-EE.

For more information on how Anjay manages the Trust Store and the Certificate Usage resource, see Certificate Usage.