11.16. Migrating from Anjay 3.13

11.16.1. Dropping built-in support for TinyDTLS as a crypto backend

Built-in support for TinyDTLS as a (D)TLS backend has been removed.

In previous versions of Anjay, TinyDTLS could be selected as a lightweight crypto backend, primarily intended for constrained environments. However, due to its limited feature set, lack of ongoing maintenance, and incompatibility with newer security requirements and LwM2M specifications, it is no longer supported.

Users are now required to use one of the supported and actively maintained (D)TLS backends, such as Mbed TLS or OpenSSL (via avs_commons abstraction layer) or creating there own Custom (D)TLS layer.

11.16.2. Changing Server Initiated Bootstrap behavior

Previously, Anjay did not use the Client Hold Off Time resource (/1/x/11) during Server Initiated Bootstrap. This was because the description of /1/x/11 states that its value should be used during Client Initiated Bootstrap.

The LwM2M specification also states that Server Initiated Bootstrap causes the LwM2M Client to enter Client Initiated Bootstrap. For consistency with this behavior, Anjay now applies the Client Hold Off Time resource in this scenario as well.

To avoid additional delay, adjust resource /1/x/11 as needed.