1. "Android Debug Bridge (adb)": <a href="https://developer.android.com/tools/adb" rel="nofollow">https://developer.android.com/tools/adb</a><p>2. "Smartphone-1 to Smartphone-2: "adb tcpip 5555" using a Linux server, android-tools, Termux, termux-usb, usbredirect, and QEMU" -- a USB cable connects the smartphones: <a href="https://gist.github.com/NoteAfterNote/ee883d5fd86c3b8ef0b0b84cac47b4d6" rel="nofollow">https://gist.github.com/NoteAfterNote/ee883d5fd86c3b8ef0b0b8...</a> (gist.github.com/NoteAfterNote/ee883d5fd86c3b8ef0b0b84cac47b4d6)