From CHANGES.md:
Release 2.0
(release date 2024-10-08)
New Features and Improvements
added support of SUN-FSK and SUN-OFDM. Enable the transmission and reception of packets carrying up to 2033 bytes of payload.
added APIs emberOfdmSetMcs() and emberOfdmGetMcs() to get and set the OFDM MCS when SUN-OFDM is used.
update EmberMessageLength typedef to allow the message length to be coded on 16 bits.
added API emberUsingLongMessages() to enable the support of NCP messages codes on 16 bits. Default to 8 bits messages.
added API emberSetUnencryptedPacketsAcceptance() to accept or refuse unencrypted packets.
Bug Fixes
fixed a segmentation fault while freeing a new firmware image