__nex_driver_io: error // Channel cannot be switched

[289536718]

@jlinktu I'm sorry to bother you again, sir, but I have a problem that needs to be solved.Similar to #17 and #34 . After entering the router and using the nexutil command, I encountered the error of "nex driver" IO, but I couldn't solve it. I tried the following:

1. Before installing the nexmon firmware, I have installed the latest version of Merlin firmware on my AC86U, and after installing nexmon, I have installed tcpdump into the router.

2. I have tried the solutions you proposed in the previous problems (including downloading nexmon again, starting the eth5&&eth6), but still failed.

I have the following problems: After entering the JFFS directory of the router, attempting to enter the following command will result in the following error:

1. If you use nexuti to view the channel, an error will be reported and the channel cannot be switched

   admin@RT-AC86U-9808:/jffs# ./nexutil -k
   __nex_driver_io: error
   chanspec: 0x6863, 85/160
   admin@RT-AC86U-9808:/jffs# ./nexutil -k36/80
   __nex_driver_io: error

2. Use nexutil to match the parameters. Whether you add or remove - S500 is still normal, but after you remove S500, dmesg will report an error

   
   admin@RT-AC86U-9808:/jffs# ./nexutil -Ieth6 -s500 -b -l34 -vKu*****AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA==
   admin@RT-AC86U-9808:/jffs# ./nexutil -Ieth6 -b -l34 -vKu******AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA==
   admin@RT-AC86U-9808:/jffs# dmesg
   .
   .
   .
   CONSOLE: 028449.710 wl1: invalid chanspec 0xe02a
   dhd_prot_ioctl: status ret value is -17
   dhd_prot_ioctl: status ret value is -17

I don't know what to do now. I hope you can help me.

Thank you very much.

I uploaded part of the code I used below
[AC86U.txt](https://github.com/seemoo-lab/nexmon_csi/files/4547081/AC86U.txt)

[jlinktu]

1. Include the interface name in the nexutil call, e.g. nexutil -Ieth6 -k.
2. Do not remove -s500.

[289536718]

@jlinktu Thank you, sir According to your instructions, I have successfully collected CSI. But I have the following problems to solve:

1. I want to estimate the angle of arrival of signals by separately analysing the signal received by each of the Asus RT-AC86U's three antennas. According to the method given by you in #59 , I have made the following settings: makecsiparams -c 149/80 -C 7 -N 1 -m MAC_address -b 0x80 After collecting the package and running it in MATLAB's readpcap.m In readpcap.m

   % data link type
   In obj. Global_header. Network = freed (obj. FID, 1, '* uint32');

   network shows 1

So, I hope you can give me the answer:

1. Whether I set the parameters correctly. If not, what to do if I want to use 3 antennas at the same time?

2. How to modify the code of MATLAB to get the correct image in plot? I can't see it if I add three lines of code directly in #51 according to you.

   payloadbytes = typecast(payload,'uint8');
   core = bitand(payloadbytes(56),3);
   rxss = bitand(bitshift(payloadbytes(56),-3),3);

   Thank you very much

[mikeWangJC]

hi guys， I have successfully collected data with three antennas，simultaneously. The problem is the data collected by the third antenna is always zero!!! I have checked that there is no problem with this antenna. This is unreasonable， does anyone know why ??

[Junye97]

@mikeWangJC i would check if the third spatial stream exists at all. I used the router to collect a single spatial stream CSI and only one antenna returns non-zero values. Alternatively, you can inspect the pack files using wireshark.

[mikeWangJC]

@Junye97 Thank u for ur suggestion. I will carefully check whether the third antenna exists。 BTW, I'm trying to form a transceiver pair by using the an router and raspberry pi. In the process, I failed to control the signal bandwidth and frequency. @jlinktu Have u ever met such problem? do u have any suggestion?

[289536718]

@mikeWangJC 谢谢您的回复，您的问题我也想要解决，现在我开了新的链接#69

[yujianyuanhaha]

@289536718 Hello, I also met the same problem of __nex__driver__io: error

Does install MERLIN is a must? @mikeWangJC @289536718 @jlinktu I am working on official firmware _3.0.0.4.38432799-gfe72567, everything look fine till I fail at execute nexutil

[289536718]

@yujianyuanhaha Sure. Install the merlin can open the jffs in your ac86u.

[jlinktu]

no, merlin is not required. regarding __nex__driver__io: error make sure the modified firmware is loaded and to use the correct interface name with nexutil.

[yujianyuanhaha]

no, merlin is not required. regarding __nex__driver__io: error make sure the modified firmware is loaded and to use the correct interface name with nexutil.

yes, i later notice the error come from I have to make install-firmware ... after the router reboots

[B6G-K1LLER]

I got monitor mode working and airdump but while using reaver it shows that nexdriver__io: error for some reason.

I have samsung s6 edge rooted - stock nougat rom - custom aldeon kernel 3.10.61

Wifi : bcm4358a3

Can you help me please !