I'm desperately looking for some C sample source code that describes how to implement a HID client using Bluez. More specifically, I would like to know how to write an application that sends keyboard inputs over bluetooth to another Linux system. (Really, the fact that the receiver is running Linux/Bluez shouldn't matter.)
-Cheers
hidclient http://anselm.hoffmeister.be/computer/hidclient/index.html.en ?
Shamelessly copying from a previous answer of mine:
Some time ago I found this project:
http://nohands.sourceforge.net/index.html
They emulate a full-blown headset with
audio and keyboard controls on the
Linux bluetooth stack. If they can
emulate something like that, you would
probably be able to emulate something
simpler like a keyboard.
Here is full example apply to keyboard and mouse include get report set report virtual unplug function. the client hid is slave side...
http://fatalfeel.blogspot.tw/2013/09/hid-client-of-bluez.html
and you can refer to bluez/android/hidhost.c(Master side) see how to connect to slave
Related
I have a question linked to Linux and serial port.
I want to be able to receive and send messages to a dedicated serial port and to redirect it to another port (/dev/tty).
For the first part, I’m able to dialog with my hardware equipment without any problem, but I’m just wondering if it’s possible to intercept and redirect message coming from a serial port #1 to another port #2.
To give more context, I had used a GPS Antenna and NTP open source software for years.
Since 2018, the new GPS antenna protocol has modified the order of bytes in the message used by NTP to steer and now it’s not working anymore.
So my idea is to put a simple C program (middleware) which fixes this byte ordering; but I’m wondering if I have to build a kernel-specific module or if it can be done in another way. The NTP software uses the symbolic link to dialog.
Thanks for your help.
You can probably use a simple redirect, look here:
Pipe One Serial Port to Another in Linux
If the ports are in different rates you can use stty or perhaps screen to adjust: https://unix.stackexchange.com/a/117064
If you need it to be in c program to manipulate it you can use the following: https://stackoverflow.com/a/6947758/8901188
Using c it will need to run in an infinite loop so it can constantly read, manipulate and write the data.
I'm doing some experiments with lwIP on a small, embedded device. There are some examples that come with lwIP but they do not help me. What I want to implement is a server (using wlIP) that accepts a connection, reads several commands, sends several answers to the connected client and closes only when the connection is interrupted or a special close-command is sent.
So somehow similar to a telnet-server.
Is there an example for lwIP available that demonstrates this behaviour?
Thanks!
I know this is an old question - but I found it when looking for something similar!
If you look in the lwip contrib directory (http://download.savannah.gnu.org/releases/lwip/) there are some example applications - including a tcp (and udp) echo server.
You don't say what device you are using or whether or not you are using an RTOS, so it is hard to provide example code. However, if you are not using an RTOS I would highly recommend you start! My experience of using the lwip raw api (without an rtos) is that it is difficult to read data from the outside world (e.g. using interrupts) without things falling over.
HTH,
Alex
I am working on creating a touch pad device (custom hardware but similar to an android device) that acts as a touchscreen drawing pad similar to the Wacom Bamboo drawing pads. However, the key feature of the device is instead of connecting it to the computer with wires or via Bluetooth, it connects to the local WiFi network and searches for devices with a port open (currently 5000 for testing purposes). Currently, I have a client written in C that when launched opens up a DatagramSocket on port 5000 and waits for a custom UDP packet containing normalized X, Y, and pressure. Then, for testing purposes, I am putting the normalized X and Y into SendInput. SendInput "works" however injecting packets into the computers current mouse is not what I want. Instead, I want to have it considered as a seperate input device so programs like gimp will be able to detect it and assign custom functions based on the data (ie: have gimp utilize the pressure data).
The problem is I dont know where to start to create a driver that does the former. I have been extensively looking at the winddk thinking that might be the key. The problem with the winddk is I cannot find any documentation on creating a HID driver using data that is not from a ps/2 or usb. This tutorial got me thinking about using IOCTLs, but I am not really sure how to make them be considered as input.
As a side note, in the title I said TCP/UDP because I am willing, and considering for security purposes, to change from UDP connection to TCP.
If someone can push me in the right direction or link me to some related documentation and samples, that would be awesome because right now I am lost. Thank you.
I bought a usb otoscope from the internet and I want to create an application that uses it. When I plug it into the computer, it reads the device as a USB Camera, and I can use the very barebones software supplied to communicate with it. I'm very new to the idea of communicating with usb all together. I've tried to look at some sites like this: http://www.jespersaur.com/drupal/book/export/html/21, that tell me how to reverse engineer a device. I don't know if I'm going down the right path with this...
I've downloaded USB Snoopy and I can't seem to get it to sniff the packets correctly. I also have Crunchbang linux installed on a different computer but I don't know how to sniff it on that either (especially because the drivers are native to windows). All I want is some sort of API/Interfacing functions for me to call and use. How do I go about doing such a thing? I'm able to locate the device on the device manager in windows, and it tells me hardware ID's and such. I can supply any information if necessary. Thank you.
EDIT - Small description I found of the otoscope: http://microscopesimgv.blogspot.com/2012/08/oasis-ehev2-usbplus-20mp-handheld-usb.html
would this tool help you any?libusbx is a cross-platform user mode library that provides generic access to USB devices
CHEERS!
I have just managed to write my first windows driver (havent registered it yet- but i managed to get the things created!).
I wondered if someone can give me a high overview of how I could achieve the following:
I would like to write a driver which will implement some behaviour when a network packet is received by the computer, before windows does what it does with the packet, i'd like to take this data and output it to the console of a C or C++ program.
Lets assume I have a C/C++ program written, which has a console. How does the C/C++ program interact with the driver I wrote which is hooking the network activity? Is it simply some C code which calls my drivers, the function returns the data as an object and then I can use that object to display in the console?
Thank you in advance for any possible replies
You don't need a driver for this task. Use packet sniffer library like PCap (actually you'll need WinPCap). It's really simple to capture packets and print them to console.
Alternative way is raw socket. But desktop Windows (as opposite to Windows Server) limits raw socket functionality.
If you really want a driver, or have a requirement to manipulate or filter packets before they hit the windows network stack you need to look into filter drivers.
This filter driver can then expose a device file on which your user space application can then read/write. The windows DDK contains examples.