Xiaomi launched an air purifier last week, and now the Chinese company is putting hard cash behind its smart home push after investing over $200 million in home appliance firm Midea. Xiaomi Inc., one of the Chinese firm’s group of technology companies, bought a 1.29 percent share of Midea Group, Midea’s Shenzhen-listed parent company, for RMB1.266 billion, that’s around $205 million.