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QUESTION
Summary:
While capturing USB traffic with wireshark, I see that devices enumerate properly when plugged in, but I never see the USB address getting assigned by the host.
Details:
I have tried this on both Windows 10 and Linux, and on several types of USB devices.
I plug in a device, and capture the USB traffic using Wireshark. I expect to see a Setup transaction, with the data packet containing bRequest = 0x05 (SET_ADDRESS) and the wValue word containing the address to be assigned. But I never see this.
The wireshark capture does show the other traffic I expect, like "GET DESCRIPTOR" request and response for the device, but no SET_ADDRESS.
The simplest device I have is a USB 1.1 mouse, and the wireshark capture (summary lines only) is below.
ANSWER
Answered 2022-Mar-12 at 02:57After more searching and experimenting, I have an answer.
The Short Answer: Wireshark cannot show the USB address assignment transaction because it is not captured by the lower-level libraries used by wireshark.
The Full Story: For some reason, it seems that the USB libraries used by wireshark do not capture the address assignment. The Windows version of these libraries, usbpcap, acknowledges this and other limitations on the web page. I did not find a similar disclaimer for the Linux version, but I suspect that the same technical limitations would affect both versions, and that's why I did not see the address assignment in wireshark on either Windows or Linux.
To verify that the USB device enumeration was working even though not captured by wireshark, I programed a USB device on a TI ARM development board which had pins on the D+ and D- USB signal lines. I attached a logic analyzer and captured the enumeration sequence. The result was exactly as described in every USB tutorial. Here is the part of the enumeration sequence where the device address is assigned: After the token packet (with Setup Packet ID, still using address 0, endpoint 0), the Setup packet with a DATA0 PID contains in its payload the expected bRequest byte 0x05 (SET_ADDRESS) followed by the low byte of wValue, equal in this example to 0x26, the assigned address. Don't forget when looking at captures like this that the least significant bytes and bits come first. So to make sense of each byte, you need to flip the bit stream byte-by-byte before converting to the hex values. So 01100100b becomes 0010 0110 or 0x26.
QUESTION
I am trying to do a large data check for a database. Some fields in the database are hidden, so when I am doing the datacheck, I need to ignore all hidden fields. Fields are hidden based on conditional logic stored in the database. I have exported this conditional logic and have stored it in a dataframe in R. Now I need to automate the data check by somehow using the text string of a conditional argument to automate the script writing itself, which I do not think is possible, or finding a way around this problem.
Below is example code that I need to solve:
...ANSWER
Answered 2022-Mar-08 at 02:31You can store the expression
you want to eval
uate as a string
if you pass it into parse()
first as explained in this answer.
Here's a simple example of how you can store the expression
in a column and then feed it to dplyr::case_when()
.
QUESTION
I'm trying to build a JSON tree using recursive API calls but I am having issues with flow control of the data structure. How can I block the flow until the BuildTree function stack ends?
Here is the partial code. Thanks in advance.
...ANSWER
Answered 2022-Jan-28 at 08:18You are using the async
keyword for no reason, because you are not using await
inside your function. You might as well use it :)
QUESTION
My goal is to block keystrokes from reaching the OS using IOHID (Can't use CGEvent for other reasons). According to the docs of kIOHIDOptionsTypeSeizeDevice
:
...Used to open exclusive communication with the device. This will prevent the system and other clients from receiving events from the device.
ANSWER
Answered 2022-Jan-19 at 20:56Glad we tracked down your HID issue to a permissions problem in the comments.
To run code as root in production/deployment, you'll need to set up a separate tool as a Launch Daemon, and configure it to start up on demand when your main app sends it an IPC (typically XPC) message.
You have 2 main options for getting the launch daemon set up in the first place:
- Embedding the daemon binary in your .app, and calling
SMJobBless
from your app's code to install it in the system. This will request entering the admin password from the user. - An installer .pkg that places your daemon binary somewhere fixed (e.g. below
/Library/Application Support/YourAppName/
) and places the corresponding launchd plist in/Library/LaunchDaemons
.
Note that you need to be quite careful to avoid opening gaping security holes when setting up a launch daemon. This series of articles is a good in-depth guide of what to do and what to avoid.
Note also that SMJobBless
is not permitted on the App Store, so this type of functionality simply isn't possible for apps distributed there.
QUESTION
I am having this issue for a while now. We've a nuxt website running in SSR mode and inside it, it has a news page that follows this structure:
...ANSWER
Answered 2021-Dec-23 at 15:01I found the issue The problem was that I configured my axios httpClient so it expects a status 200 for a positive response, but facebook / linkedin / whatsapp ... ( not twitter ) only makes a partial request which returns a 206 response. See: Facebook debugger : Response 206
So, my url and tags were all correct, everything I had to do was to enable 206 as a possible response.
QUESTION
I have a vanilla js jsencrypt package which i needed to use in my nuxt application, the package itself works fine when imported from Nuxt.config.js but i run into issues when imported using the head object from component, let me show you my code
nuxt.config.js //this works
...ANSWER
Answered 2021-Dec-05 at 18:45Pulling in JSEnquiry in your head tag will work just fine, but you need to allow time for it to download and parse. Calling it in the mounted hook doesn’t allow for that.
Try this in your mounted hook.
QUESTION
i have set animation in property on HTML element when it is displayed
, i want same animation on reverse, when button is clicked it should hide with same animation
.
how can i achieve that.
"Animation in" which is working:
...ANSWER
Answered 2021-Nov-21 at 06:33You can achieve this by using toggle class and transition instead.
QUESTION
In macOS, the IOKit
HID
APIs can be used for key remapping. In the example below, A key is remapped to B key, and vice versa, using Objective-C.
Is it possible to do the same remapping programmatically with the latest Swift 5.5? If it can be done, how does the example below look rewritten in Swift?
Or is there a new, more modern API that can be used with Swift to accomplish the same task?
...ANSWER
Answered 2021-Nov-18 at 06:12You can rewrite your cursed code in Swift 5.5 like this:
QUESTION
I'm trying to deploy my nuxt js project to netlify. The installation part works fine, But it returns an error in the build process.
I tried to search google but I can't find any solution to this problem.
I also tried this command CI= npm run generate
ANSWER
Answered 2021-Nov-11 at 15:42I just had the same problem and solved it thanks to this question. The problem seems to be fibers.
The steps I took to fix it:
- uninstall fibers:
npm uninstall fibers
- delete
package-lock.json
&node_modules/
- install packages again:
npm install
Simply removing fibers from package.json
isn't enough as Netlify seems to still find the package in package-lock.json
.
QUESTION
I need to find out how many people ordered what type of food. My table looks something like this:
PersonId (int) Hamburger (varchar100) Fries (varchar100) Soda (varchar100) 1 "Unique burger" "Unique Fry" "Unique Soda" 2 "Unique burger" "Unique Fry" "Unique Soda" 1 "Unique burger" NULL "Unique Soda" 3 "Unique burger" "Unique Fry" NULLAs you can see the PersonID
can occur more than once.
I need the total count of Hamburgers, Fries, and Soda per unique person.
So ideally my result set would look like this:
HamburgerCount FriesCount SodaCount 12334243 567456745 2463434From what I've tried, so far this query gets me my desired result for a single value:
...ANSWER
Answered 2021-Oct-22 at 19:23If you don't mind vertical results, you could use UNION:
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