I think part of the problem with the question if OSHW companies could be acquired is that many people who start companies and practice open source aren't necessarily looking for an exit strategy that involves an acquisition.
If you start, day one, thinking your trajectory is acquisition, it's less attractive to be open: one way to prop up your value is by controlling the flow of information about your product.
What are the engineering and design challenges in creating successful IoT devices? These devices are usually small, resource-constrained electronics designed to sense, collect, send, and/or interpret data. Some of the devices need to be smart enough to act upon data in real time, 24/7. Specifically the guests will discuss sensors, security, and lessons from IoT deployments.