AC68U - RTL2832U and Entware

[markcs]

I have an AC68U with Entware installed. I wanted to get my RTL2832U USB stick working on the router instead of having to use a Raspberry Pi.

I installed rtl_433, but when I try to run it, I get the error:

Input: The internals of input handling changed, read about and report problems on PR #1978
SDR: Found 1 device(s)
SDR: trying device 0: Realtek, RTL2838UHIDIR, SN: 00000001


Kernel driver is active, or device is claimed by second instance of librtlsdr.
In the first case, please either detach or blacklist the kernel module
(dvb_usb_rtl28xxu), or enable automatic detaching at compile time.


usb_claim_interface error -6
sdr_open_rtl: Failed to open rtlsdr device #0.
sdr_open_rtl: Unable to open a device

Is there any way to disable dvb_usb_rtl28xxu as I can't find any other process that would be using this device already.

Help appreciated

 

[ColinTaylor]

I'm pretty sure the RT-AC68U firmware doesn't include the dvb_usb_rtl28xxu kernel module.

 

[markcs]

I'm pretty sure the RT-AC68U firmware doesn't include the dvb_usb_rtl28xxu kernel module.

Thanks, that would make sense as I couldn't see anything that looked like dvb_usb_rtl28xxu. Why would I see that message then?

 

[ColinTaylor]

Why would I see that message then?

I don't know. If I had to guess I'd say that it's probably expecting to be able to load some module and when it can't it just throws out that default error message.

What is the end use case here?

 

[ColinTaylor]

Try issuing this command before you run rtl_433.

modprobe -r option usb_wwan usbserial

What command line are you using?

# rtl_433 -v
rtl_433 version -128-NOTFOUND branch armv7-2.6 at 202407171205 inputs file rtl_tcp RTL-SDR
[Protocols] Registered 216 out of 250 device decoding protocols [ 1-4 8 10-12 15-17 19-23 25-26 29-36 38-60 63 67-71 73-100 102-105 108-116 119-121 124-128 130-149 151-161 163-168 170-175 177-197 199 201-215 217-232 234-241 243-244 246-247 249-250 ]
[Input] The internals of input handling changed, read about and report problems on PR #1978
[SDR] Found 1 device(s)
[SDR] trying device 0: Realtek, RTL2838UHIDIR, SN: 00000001
Found Rafael Micro R820T tuner
[SDR] Using device 0: Realtek, RTL2838UHIDIR, SN: 00000001, "Generic RTL2832U OEM"
Exact sample rate is: 250000.000414 Hz
[R82XX] PLL not locked!
[SDR] Sample rate set to 250000 S/s.
[Input] Bit detection level set to 0.0 (Auto).
[SDR] Tuner gain set to Auto.
[Input] Reading samples in async mode...
[SDR] Tuned to 433.920MHz.
[Baseband] low pass filter for 250000 Hz at cutoff 25000 Hz, 40.0 us

 

[markcs]

Try issuing this command before you run rtl_433.

modprobe -r option usb_wwan usbserial

You are a star.

I have been stuffing around trying to find out the correct format for modprobe to unload module usbserial, but couldn't work it out. This worked for me.