China watchCybersecurity Experts Worried by Chinese Firm’s Control of Smart Devices From rooftop to basement and the bedrooms in between, much of the technology making consumer products smart comes from a little-known Chinese firm, Tuya Inc. of Hangzhou.More than 5,000 brands have incorporated Tuya’s technology in their products. Cybersecurity experts are worried, and they urge Washington to limit or ban Tuya from doing business in the United States, in part because a broad new Chinese law requires companies to turn over any and all collected data when the government requests it. Smart home thermostats. Smart home security cameras. Smart refrigerators....