adb over Wi-Fi (Android 11+) on Windows: how to keep a fixed port or connect automatically?

Question

The wireless adb connection works fine on my Android 11 phone + Windows workstation.

But it's not convenient, as every time the phone Wifi disconnects/reconnects, I have to:

1. Turn on wireless debugging in Android settings.
2. Take note of the port number XXXXX, which changes every time!
3. Run adb connect 192.168.1.10:XXXXX on the computer.

Is there a way to skip step 2, by either:

• making the port fixed?
• making Windows automatically detect the phone on the new port? (documentation seems to imply that step 2 and 3 are not needed on MacOS, once the pairing is done, I wonder how this works)

Answer 1

You can make the port fixed until reboot by adb tcpip

After pairing and connecting with the dynamic port

try adb tcpip 4444

then you can use adb connect ip:4444 until reboot (ya after reboot you've to connect with dynamic port and set tcpip to 4444 again)

Answer 2

You can dynamically get port using nmap and connect to it.

here is my solution

adb connect <device_ip>:$(nmap $IP -p 37000-44000 | awk "/\/tcp/" | cut -d/ -f1)

Scanning only ports 37000-44000 is sufficient Also wireless debugging should be enabled and device needs to unlocked during nmap scan. Run it again if the nmap doesn't find the port first time.

I have added the command to an alias so it is easy to run
ex:
alias adbw='adb connect 192.168.0.7:$(nmap $IP -p 37000-44000 | awk "/\/tcp/" | cut -d/ -f1)'

To connect next time:

1. Unlock Device
2. Enable Wireless debugging (you can add it to status bar icons)
3. run adbw if alias set.

Ex Output:
connected to 192.168.0.7:38395