fix link to webpage
Introduction
------------
-IoTivity-Lite is an open-source, reference implementation of the `Open Connectivity Foundation <https://openconnectivity.org/>`_ (OCF) standards for the Internet of Things (IoT). Specifically, the stack realizes all the functionalities of the `OCF Core Framework <https://iotivity.org/documentation/ocf-core-framework>`_.
+IoTivity-Lite is an open-source, reference implementation of the `Open Connectivity Foundation <https://openconnectivity.org/>`_ (OCF) standards for the Internet of Things (IoT). Specifically, the stack realizes all the functionalities of the `OCF Core Framework <https://iotivity.org/SIPD/>`_.
The challenge for the IoT ecosystem is to ensure that devices can connect securely and reliably to the Internet and to each other.
The Open Connectivity Foundation (OCF), a group of industry leaders have created a `(ISO/IEC) <https://www.iso.org/standard/53238.html>`_ standard specification and certification program to address these challenges.
