Hybrid Broadcast Broadband TV (HbbTV) is an industry standard for hybrid multimedia devices that are able to combine broadcast and IPTV delivery. This paper deals with companion screen devices, companion screen applications and communication of those applications with HbbTV terminal and its applications. Companion screen devices offer additional content to user and for pleasant experience communication between HbbTV terminal and companion screen devices must work flawlessly. The paper propose design and presents implementation of a framework needed for testing HbbTV device communication capabilities defined in HbbTV 2.0.1. specification. The usage of the framework is demonstrated using a simulated example.