using Archer T2U Plus with RPi for creating hotspot

[hbadshahp]

Checklist

• I acknowledge that support is provided on a best-effort basis.
• I acknowledge that the authors and contributors to this repository cannot be held responsible for the results of my use of any information contained in or linked from this repository.

uname

Linux raspberrypi 6.6.31+rpt-rpi-v8 #1 SMP PREEMPT Debian 1:6.6.31-1+rpt1 (2024-05-29) aarch64 GNU/Linux

lsusb

Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 007: ID 04d9:0006 Holtek Semiconductor, Inc. Wired Keyboard (78/79 key) [RPI Wired Keyboard 5] Bus 001 Device 006: ID 05e3:0610 Genesys Logic, Inc. Hub Bus 001 Device 005: ID 093a:2510 Pixart Imaging, Inc. Optical Mouse Bus 001 Device 004: ID 0781:5567 SanDisk Corp. Cruzer Blade Bus 001 Device 003: ID 2357:0120 TP-Link Archer T2U PLUS [RTL8821AU] Bus 001 Device 002: ID 2109:3431 VIA Labs, Inc. Hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

rfkill

0: phy0: Wireless LAN Soft blocked: no Hard blocked: no

dkms

rtl8821au/5.12.5.2, 6.6.31+rpt-rpi-v8, aarch64: installed

iw

phy#0
	Interface wlx242fd0d9e22c
		ifindex 4
		wdev 0x1
		addr 24:2f:d0:d9:e2:2c
		type managed
		txpower -100.00 dBm

What happened?

I have followed all the steps as per suggestion to configure my Tp-link Archer T2U Plus AC600, so that I will use it for as a hotspot system. Firstly I successfully installed the driver using https://github.com/morrownr/8821au-20210708?tab=readme-ov-file. Then I followed the steps suggested in https://github.com/morrownr/USB WiFi/blob/main/home/AP_Mode/Bridged_Wireless_Access_Point.md for WiFi4 configuration. But after completing the whole steps I am not able to see hotspots on other device to connect.

So I run the below command
sudo journalctl -xeu hostapd.service
░░ Support: https://www.debian.org/support
░░
░░ The unit hostapd.service has entered the 'failed' state with result 'exit-code'.
Jul 02 01:52:21 raspberrypi systemd[1]: Failed to start hostapd.service - Access point and authentication server for Wi-Fi and Ethernet.
░░ Subject: A start job for unit hostapd.service has failed
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░
░░ A start job for unit hostapd.service has finished with a failure.
░░
░░ The job identifier is 5314 and the job result is failed.
Jul 02 01:52:23 raspberrypi systemd[1]: hostapd.service: Scheduled restart job, restart counter is at 56.
░░ Subject: Automatic restarting of a unit has been scheduled
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░
░░ Automatic restarting of the unit hostapd.service has been scheduled, as the result for
░░ the configured Restart= setting for the unit.
Jul 02 01:52:23 raspberrypi systemd[1]: Stopped hostapd.service - Access point and authentication server for Wi-Fi and Ethernet.
░░ Subject: A stop job for unit hostapd.service has finished
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░
░░ A stop job for unit hostapd.service has finished.
░░
░░ The job identifier is 5395 and the job result is done.
Jul 02 01:52:23 raspberrypi systemd[1]: Starting hostapd.service - Access point and authentication server for Wi-Fi and Ethernet...
░░ Subject: A start job for unit hostapd.service has begun execution
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░
░░ A start job for unit hostapd.service has begun execution.
░░
░░ The job identifier is 5395.
Jul 02 01:52:29 raspberrypi systemd[1]: hostapd.service: Control process exited, code=exited, status=1/FAILURE
░░ Subject: Unit process exited
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░
░░ An ExecStart= process belonging to unit hostapd.service has exited.
░░
░░ The process' exit code is 'exited' and its exit status is 1.
Jul 02 01:52:29 raspberrypi systemd[1]: hostapd.service: Failed with result 'exit-code'.
░░ Subject: Unit failed
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░
░░ The unit hostapd.service has entered the 'failed' state with result 'exit-code'.
Jul 02 01:52:29 raspberrypi systemd[1]: Failed to start hostapd.service - Access point and authentication server for Wi-Fi and Ethernet.
░░ Subject: A start job for unit hostapd.service has failed
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░
░░ A start job for unit hostapd.service has finished with a failure.
░░
░░ The job identifier is 5395 and the job result is failed.

Kindly suggest me where i am wrong. Thank you in advance.

[morrownr]

Setting up a hotspot with an adapter can be very useful and educational but for maximum performance, it can be a little complicated at first. The AP_Mode/Bridged_Wireless_Access_Point.md guide has a lot of details but there are other things involved. This may not be a quick fix but rather an investigation that may take a few days.

A good place to start:

Run in the driver directory:

$ sudo edit-options.sh

Post the results of the options line so that we can see how the driver is configured.

Next, do you see the hostapd.log file? It should show up in your home directory.

[morrownr]

@hbadshahp

Checking on you. How is this problem progressing?

The rtl8811au chip is really good and it makes a good AP. It is normal for someone starting out with hostapd to make a little mistake here and there.