ADB use

ADB

Connect the device and the host with a Type-C data cable, then enter
the following commands:

   adb devices
   adb shell

Network ADB

Check the IP address of the development board and access the PC
through the network:

   adb connect + IP
   adb shell

Note:

AIO-3399-JD4 / AIO-3399J needs to modify
"kernel/arch/arm64/boot/dts/rockchiprk3399-firefly-aiojd4.dts" to
support the use of ADB, set "usbdrd_dwc3_0" to "peripheral" mode, then
the usb can only be used as a slave device use.

   &usbdrd_dwc3_0 {
        dr_mode = "peripheral";
   };

Similarly, AIO-3399Pro-JD4 needs to modify
"kernel/arch/arm64/boot/dts/rockchip/rk3399pro-firefly-aioc.dts" to
support the use of ADB.

Then recompile and flash the Kernel.