With the adoption of the Industrial IoT comes a wave of new connected devices, many of which are small endpoint devices running real-time operating systems. These systems often perform critical functions in our factories, electric grid, transportation infrastructure and other essential elements of modern society. System engineers face greater challenges today when developing IIoT-capable, network-connected embedded devices. Besides the usual issues, they must deal with security issues, encryption standards, networking protocols and new technologies. This paper describes security requirements for IIoT devices and details solutions available for securing these devices.