Preface Overview This document mainly introduces the development method based on iHC-3568JGW platform. OS version Current version of the document Revision record V2.0.3 Update time:2021-11-18 Update content: -Added "Preface", which mainly describes product Wiki revision records and OS version. Add "More Technical Cases", and add "OpenSIP Build)". Adjust the order of chapters in "FAQ". V2.0.2 Update time:2021-10-30 Update content: Added iHC-3568JGW network topology diagram. Added how to use openstf. V2.0.1 Update time:2021-9-28 Update content: Added how to use ADB. Added a new method to upgrade the iHC-3568JGW firmware in the Linux system. Fix some download links.