v5.4.0

October 21 2025

Added

• Provide interfaces (pubnub_use_tcp_keep_alive, pubnub_dont_use_tcp_keep_alive, use_tcp_keep_alive, and dont_use_tcp_keep_alive) to set up active TCP connection keep-alive packet sending.

Fixed

• Replace the Windows API, which in a multithreaded environment became a reason for crashes during the DNS resolution process.
• Fix the issue because of which client created a secondary connection when built with PUBNUB_USE_IPV6 support.