Simplicity SDK Platform - CPC Version 4.9.0 - Release Notes (Jun 23, 2026)#

Simplicity SDK Platform Version 6.1.0

The Co-Processor Communication (CPC) framework enables secure and efficient data exchange between two processors over a shared serial link, acting as a multiplexer to support multiple applications simultaneously. Designed with a Linux host (CPC daemon) as the primary device and an EFR(M) device as the secondary, CPC ensures reliable, in-order, error-free communication over encrypted UART or SPI connections.

Release Summary#

Key Features | API Changes | Bug Fixes | Chip Enablement

Key Features#

None.

API Changes#

None.

Bug Fixes#

Fixed in 4.9.0#

• Fixed a threading issue where a CPC endpoint opened in one thread could report an inconsistent state after being closed from another thread.

• Fixed compile errors that prevented Secondary SPI projects from building after switching from the UART recommended interface to the SPI recommended interface.

Chip Enablement#

None.

Key Features#

New Features | Enhancements | Removed Features | Deprecated Features

New Features#

None.

Enhancements#

None.

Removed Features#

None.

Deprecated Features#

None.

API Changes#

New APIs | Modified APIs | Removed APIs | Deprecated APIs

New APIs#

None.

Modified APIs#

None.

Removed APIs#

None.

Deprecated APIs#

None.

Bug Fixes#

Fixed in 4.9.0#

Chip Enablement#

None.

Application Example Changes#

New Examples#

None.

Modified Examples#

None.

Removed Examples#

None.

Deprecated Examples#

None.

Known Issues and Limitations#

None.