The IPv6 add-on package is now included with MQX v5. Licensing information for MQX v5 is available here.
IPv6 for MQX prior to version 5.0 are now supported exclusively by NXP Professional Support. Information on this program is available here.
The IPv6 extension for MQX Real Time Communication Suite (RTCS) is an optional IPv6 add-on for MQX RTCS. It extends the RTCS TCP/IP stack to enable dual stack (IPv4 + IPv6) as well as single stack (IPv6 only or IPv4 only) operation. It has been architected to fit within the RTCS framework seamlessly, leveraging the IPv4 codebase whenever possible to minimize memory footprint.