Eclipse Zenoh 1.5.0 (Hong)

Named after the Red Dragon, a symbol of power, protection, and passion, this release delivers significant improvements across the entire Zenoh ecosystem.

• Performance
  • 10M+ msg/sec throughput: Breakthrough performance barrier crossed, nearly doubling throughput for small messages (8 bytes) since 1.0.0
  • 25% SHM throughput gain: Improved shared memory watchdog storage architecture adds ~600K msgs/sec (2.4M to ~3M msgs/sec)
• Shared Memory
  • API simplification: Hidden low-level ProtocolID, streamlined builders, improved examples for better developer experience
  • Buffer flexibility: In-place resize operations, clarified owned vs. borrowed buffers, exposed alignment parameters
  • Enhanced safety: Improved lifetime management, unchecked mutability helpers for advanced use cases
  • Cross-platform support: Hardened Windows support, improved POSIX builder ergonomics
• Configuration Management
  • Improved validation: Proper load-time validation for access_control, downsampling, low_pass_filter, and qos/network
  • Full CLI configuration: Provide complete configuration via --cfg command line argument
  • Optional session ID: Configuration cloning and reuse now supported without ID conflicts
  • DSCP support: Control router/switch QoS treatment of Zenoh traffic per endpoint
  • Link weights: Weighted routing graphs support for cost-based path optimization
• Protocol Enhancements
  • QUIC datagram mode: Unreliable datagrams in QUIC with configurable MTU and discovery intervals
  • Entity identification: Breaking change to replier_id API returning EntityGlobalId for global queryable identification
• Language Bindings
  • Advanced Pub/Sub: Now available in Python and Kotlin with full feature parity
  • Zenoh-TS improvements: Binary serialization for better performance, camelCase API migration, async WebSocket functions, new bridge variant with standalone application
  • Zenoh-TS examples: Nuxt example application demonstrating SSR integration
• Zenoh-Pico
  • STM32 ThreadX support: Serial transport integration for ThreadX RTOS
  • Multicast declarations: Optional Z_FEATURE_MULTICAST_DECLARATIONS for integer key expressions and write filtering
  • Performance optimizations: Lower latency, increased small packet throughput, reduced memory allocations
  • New logging system: Enhanced compile-time logging with ZENOH_LOG environment variable
• Installation & Security
  • Signed Debian repository: Enhanced security with GPG-signed package repository
  • Updated installation process: Simplified installation with keyring-based verification

Read the details in the blog post at https://zenoh.io/blog/2025-07-28-zenoh-hong/