【提问】：HF2211 SDK
【详情】：Hello. Where can I download the SDK for the HF2211? On the HF2211 product page (http://www.hi-flying.com/wi-fi-iot/wi-fi-serial-server/rs232-rs485-rs422-to-wifi-serial-server) it says "Open SDK -- Products like embedded industrial computer has packaged SDK interface for users to do secondary development...". Can you please provide a link to the SDK download. Thanks!