Qualcomm Robotics RB5/RB6 - Using ADB
ADB (Android Debug Bridge) is a command-line tool for communicating to a device with ADB enabled. The tool works as client/server communication, where the client can send commands to a device, the server is in charge of connecting to the device and a Daemon that actually executes the commands sent by the client. ADB allows actions such as file sharing between computer and device an running shell commands on the device.
This section will help you into accessing the board with ADB, if you haven't installed ADB in your host PC, follow the step 2 in the section Linaro-Getting Started before continuing[1]:

1. Connect the USB type-C cable to the board, see Figure 1, and the other end to your host PC.
2. Connect the power cable to the board.
3. In your host PC type the following command to check if the device is registered:
adb devices
It should look something like the following when the device is registered:
$ adb devices List of devices attached 3b73cc0 device
4. Once the device is registered type the following command to enter the board:
adb shell
Your terminal should change and look similar to the following:
#
In that case, you can now execute shell commands inside the platform.
References