B4A-Bridge is a tool for B4A developers that allows connecting the IDE to physical devices over the local network. See https://www.b4x.com for more information. B4A-Bridge was written in B4A. The source code is available in the forum. B4A-Bridge includes an internal FTP server. You can use it to browse the secondary storage (File.DirRootExternal) with a FTP client or Windows Explorer.