ADB (Android Debug Bridge) is a command-line tool used to facilitate communication between an Android device and a computer. It enables developers to debug, install, and manage applications on Android devices.

ADB over USB refers to the ability to connect an Android device to a computer using a USB cable and use the Android Debug Bridge (ADB) to communicate between the two devices. This feature is a commonly used method of debugging, testing, installing, and managing Android applications, as it provides a reliable and fast connection between the Android device and the computer. It's important to ensure that your USB cable is in good condition and that the correct drivers are installed on your computer to avoid any connection issues.

ADB over TCP refers to the ability to connect to an Android device over a network using ADB. This feature allows developers to remotely access and control Android devices for debugging and testing purposes without the need for a physical connection. In this case, both the Android device and the computer need to be on the same (virtual) network, and the device must be set up to allow ADB debugging. The device can then be connected to the computer using its IP address and the ADB command-line tool.

Using the ADB debugging function provides a number of advantages for integrators and software developers in the rapid deployment, testing, and debugging of final software solutions. However, enabling ADB over TCP can potentially create a security vulnerability as it opens up a network port on the Android device that can be accessed by other devices on the same network. This means that if an attacker gains access to the same network, they could potentially connect to the Android device using ADB over TCP and perform unauthorized actions. It's important to note that enabling ADB over TCP does not automatically make an Android device vulnerable to attack, but it is one potential point of entry for attackers. To mitigate this risk, it's important to take appropriate security measures, such as setting up a secure network, using strong passwords for both the Android device and the computer, and disabling ADB over TCP when not in use. It's also recommended to only enable ADB over TCP for specific tasks and to disable it once those tasks are complete.

It's important to note that non-professional use of ADB commands can lead to irreversible consequences and equipment failure. Therefore, the use of these functions is not recommended for the end user.

You can turn ADB over TCP on and off on a ProDVX Android device by following these steps:

1. Enable developer options on your Android device if it's not already enabled. To do this, go to Settings -> About Device, then tap on "Build Number" repeatedly until a message appears saying "You are now a developer!"
2. Go to Settings > Developer options and scroll down to the "Debugging" section.
3. Turn on/turn off "USB debugging" to enable/disable ADB over USB. 
4. Turn on/turn off "ADB debugging over TCP" to enable/disable ADB over Ethernet or WiFi.
5. To connect to the device from a computer, open a command prompt or terminal on the computer and enter the command "adb connect <IP_address>:<port_number>".    

Please note that when "USB debugging" is disabled, "ADB debugging over TCP" is also disabled and cannot be enabled. To disable "USB debugging" through the command line, please use "settings put global adb_enabled 0".

ProDVX Android devices come with "USB debugging" enabled by default and "ADB debugging over TCP" disabled by default.