I have a projector that can accept control commands like turn on/off and queries like amount of time it was on.
Control commands work, but I can't seem to capture responses from queries; when I connect via USB, I get two additional raw input files in the dev directory.
I wrote a C program that captures events from input devices it captures mouse movements and keyboard events, but it doesn't capture replies from the projector at all, not even the event itself. Why is that?
In Windows, everything works.
Related
I have 2 applescripts (saved as apps) that make webhook calls in a loop to control the volume of my stereo. Each script displays a dialog that asks for a number of ticks to tick the volume up or down, and it loops to make the webhook call each time.
Background: I wrote a program called pi_bose that runs on my raspberry pi to send commands to my Bose Series 12 stereo. It sends codes on the 28Mhz band using a wire as an antenna plugged into one of the GPIO ports. Node red receives the webhook calls and runs that script. But there are various things that can make it fail. The antenna can be loose because the pi has been bumped. Node red isn't running. The program has a small memory leak that causes a problem after having been used for about 6 months. And sometimes there's background interference that makes not every transmission work (I could probably use a longer antenna to address that I guess). But sometimes, whatever is playing on the stereo is just so soft that it's hard to detect the subtle change to the volume. And sometimes, it seems that either the webhook call happens slowly and the volume is changing - it just happens over the course of 20-30 seconds. So...
I know I could do the loop on the pi itself instead of repeating the webhook call, but I would like to see progress on the mac itself.
I'd like some sort of cue that gives me some feedback to let me know each time the webhook call happens. Like, a red dot on the AppleScript app icon or something in the corner of the screen that appears for a fraction of a second each time the webhook call is made.
Alternatively, I could make the script make some sort of sound, but I would rather not disrupt audibly whatever is playing at the time.
Does anyone know how to do that? Is it even possible to display an icon without a dialog window in applescript?
I am using the XInput2 interface in C++ to get raw input events for keyboard and mouse on my X11 application to linux. That works fine.
I have a joystick and a bluetooth connected game controller (xbox controller like)
I don't see any events from either of those using XInput2
Should I expect to be able to get events from those as well as keyboard & mouse or is there a different method I should use for them?
A brief look seems to indicate that I can use read events from /dev/input/event* for them. Is this the correct way to interface with them in low level linux. That seems a pity as I'll need two entirely different input event systems, one for keyboard & mouse, and one for controller and joystick so wanted to make sure before going that way.
I have a bluetooth keyboard that I use on a regular basis. It has a Logitech logo, but is manufactured by ZAGG and has model number Y-R0023.
I have paired the keyboard with my Ubuntu desktop and it works great.
Upon powering up my computer and keyboard, I can sometimes reconnect without having to pair again, but other times I have to remove the existing pairing and reconnect before Ubuntu can receive keystrokes.
Extra information: Ubuntu displays a bluetooth symbol as a status when it connects (regardless if it is able to receive keystrokes or not). This symbol will appear and disappear roughly every 10 seconds until the two devices are able to successfully negotiate a valid connection.
I notice that I have best success when I press 'delete-delete-enter-enter' after powering the ZAGG keyboard up. (Sometimes, just repeatedly pressing a key every second or so seems to work too.)
I am wondering if the "delete-delete-enter" keystroke combination (or some other that I haven't discovered) is recognized by the Logitech BIOS as a special sequence to help retry a paired re-connection. I'd be interested in finding out if this trick works for devices other than those made by ZAGG. Otherwise, it would help just to know if there is a reliable script I can run that calls bluetoothctl to help improve the re-connection. (I want to avoid having to enter a pairing code on subsequent connections).
ZAGG sites and Logitech ones don't say anything about this key combination. So I don't think it's recognized as a special sequence, only advice they give is to re-pair the device when it's not working.
In summary I'm sure they would include this troubleshooting option in manual and/or troubleshooting guide if it was present.
I have a 40x7 VFD that functions as a serial terminal. It has a dedicated keypad that provides hex-entry, however, I would like to use a keyboard for the standard input. Basically, I want to be able to use the VFD as a display for a Linux bash prompt, but use the keyboard connected to the computer as the means of input. Instead of connecting a monitor, the serial terminal will be the monitor. I can get the login prompt displayed on the VFD with agetty, but since it only has hex-entry, how can I change where the system is looking for standard input?
Thanks,
Core_Module
I think the best method would be to create a pseudo terminal. In doing so you create a fake terminal device with a /dev/pts/[n] name that acts like a real input/output device. A program could connect the console (keyboard) as input and the VFD as output and send and receive that data over the pseudo device. You can then point agetty at the /dev/pts/[0] device instead of a /dev/ttyS[n] device. Some ideas on doing this can be found in many tutorials online. From the link:
A pseudo-terminal is a pair of character mode devices also called pty. One is master and the other is slave and they are connected with a bidirectional channel. Any data written on the slave side is forwarded to the output of the master side. Conversely, any data written on the master side is forwarded to the output of the slave.
I found another StackOverflow question that may also be of assistance. See this link. It could be adapted to suit your needs.
What is the best way to capture HID input on linux for games? I don't need anything special. Just mouse and keyboard. Right now I'm using Xlib. I have a separate input thread, which has its own connection to the X Server (Display instance) and it handles events for main render window. It is working just fine, but it is a bit limited. For example, I'm missing mouse raw input.
Have you tried opening and reading device files in /dev/input?