Kind of a followup to this question, I have been able to:
Find the device for with which I am working, disconnect it from the kernel, and claim the (single) interface. . . and that's about as far as I can get.
When I try to write to the device (which is a custom wireless transceiver, not my own design), I get (when using LibUsb.bulkTransfer with the endpoint 0x00):
LibUsb.bulkTransfer(handle, (byte)0x00, bb, transfered, 5000);
an Input/Output error, and (when using LibUsb.bulkTransfer with the endpoint 0x81):
LibUsb.bulkTransfer(handle, (byte)0x81, bb, transfered, 5000);
a TimeOut error.
I'm pretty sure I have absolutely NO idea what I'm doing here (which doesn't help my position), and this is way deeper than I am accustomed to going as far as communicating with devices on a lower level (the most I've done is interop with .Net).
I've seen the lsusb command and executed it and gotten... a lot of stuff, and I can recognize some of it, but most of it I'm kind of lost with and was hoping for someone to hold my hand, or point me to a sort of... USB for Dummies guide that might help me figure out what I need to do.
The end result (ideally) will be a Java package that allows cross-platform communication with the device without any sort of tinkering on behalf of the end-user (and by cross-platform I mean, windows, linux and mac, which is why I'm using the java4usb java library).
Where I am right now is, using the output from the lsusb command, I'm hoping to be able to send commands from the transceiver to the external device with which it communicates. (basically it sends commands to a device connected to an LED that can turn the LED on and off, and make it flash, and it also can receive commands from that device and respond accordingly to them, but baby steps).
The lsusb output you can find here (it's quite verbose, and I didn't want to flood the question with more than necessary). Any help or direction would be tremendously appreciated.
EDIT: A bit more research reveals (from the lsusb output) that the 0x81 endpoint is an interrupt type. Putting 2 and 2 together lead me to the conclusion that I wanted neither a bulk transfer nor a control transfer but an interrupt transfer:
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0002 1x 2 bytes
bInterval
LibUsb.interruptTransfer(handle, (byte)0x81, bb, transfered, 1000);
Unfortunately I'm still getting a Timeout error.
EDIT: Some more information is needed:
It has been suggested for Synchronous control (which is fine for half of what I need to do) that I should use the usb4java.LibUsb controlTransfer method, which is fine but there are several parameters that need to be filled, and I do not know what it is with that they need to be filled:
public static int controlTransfer(DeviceHandle handle, //I know this.
byte bmRequestType, //<--- What goes here?
byte bRequest, //<--- What goes here?
short wValue, //<--- What goes here?
short wIndex, //<--- What goes here?
ByteBuffer data, //<--- What goes here?
long timeout) //<--- What goes here?
Any and all direction to the answer to what I need to populate these fields with would be a great help and greatly appreciated.
Related
I have installed touchOSC on my phone and I would like to control the score editor Musescore (that accept OSC messages).
Problem: touchOSC send messages always together with a double value while a lot of controls I'd like to use in Musescore has a method signature with no arguments at all (e.g. /actions/play to start playback of the score).
So, the only way I'm figuring out right now is to write a sort of listener (python? java?) listening to touchOSC, changing the message (typically, cutting the double value) and sending the modified message to the right port for Musescore.
I have some Java skills but I wouldn't know how to manage OSC message.
I have also downloaded a python library named simpleOSC but I have 0 skills in python.
Could someone help?
Thank you very much
https://pypi.python.org/pypi/SimpleOSC
I'd recommend to use PureData for this: https://puredata.info/
It's free, open-source, cross-platform and is equipped to do what you want: Receive OSC messages and filter/modify/forward them, all in a visual, flow-based programming way.
Here's the "TouchOSC | OSC with PureData" tutorial, which has some basic example PD patchers as well to get you started:
https://hexler.net/docs/touchosc-getting-started-osc
I was sent iOS C code to get data from a Bluetooth Low Energy scale and I need to find out how to create similar functions into Android Java code.
The scale I am working with aren't using typical UUIDs and formatting.
I already have a scanner set up with the ability to write and listen to notifications.
What I need to do is figure out how to get the weight data.
I know is that 0XFFF0 is the service UUID, 0XFFF1 is the write characteristic and 0XFFF4 is the notify characteristic.
I'm guessing it writes something, then the scale gives you the data. But I'm not sure what.
Plus I think the scale sends the data with NSUTF8StringEncoding if I'm reading it correctly. How would I implement this on Java?
Here is the code sent to me:
http://www.anj.fyi/BTManagerlib.m (I tried to post the code here, but it's registering as spam for some odd reason)
I really appreciate the help guys.
Many thanks.
"The scale I am working with aren't using typical UUIDs and formatting."
Yes, it uses, except it is written in 16-bit format If you want 128-bit UUID use XXXXYYYY-0000-1000-8000-00805F9B34FB base to create it.
From the example that you have posted:
-(void)writeDataToBlue:(NSNotification *)note
{
id obj = [note object];
_senddata = obj;
[self sendBlueToothData:_senddata showAlert:YES];
}
it is clear that data to be written to the device are not bundled into the source code, but they are received via notification center, from some other class. Ask them for device documentation or full source code, otherwise you won't be able to make any conclusions.
My problem is that Asterisk seems to be answering the phone just a bit too late after the "Hello?" for the AMD functionality to work right, i.e. the AMD comes in on the silence and the person has to say hello again for it to know there's a person there.
We've tested it using IAX via a softphone and see more or less the same delay upon answering so we're assuming it's the Asterisk configuration.
I have more or less a vanilla Asterisk install. We are initiating outbound calls via SIP through a local provider. I'm using the "Manager" portion of the Java Asterisk API to tell Asterisk to make the call and then the Java Agi API to deal with it.
The SIP portion of the config looks like this (sip.conf):
[my-sip-trunk]
disallow=all
allow=ulaw
allow=alaw
allow=gsm
host=<ip to our provider>
type=peer
canreinvite=no
nat=never
The data I send via the Manager to Asterisk looks something like this:
Channel: SIP/<phonenumberhere>#my-sip-trunk
Context: MyContext
Extension: 100
Priority: 1
Caller ID: <caller's caller ID>
In my extensions.conf I have the appropriate info and-- solely for the purpose of this demonstration-- only a couple of commands:
[MyContext]
exten => 100,1,Answer()
exten => 100,n,Background(beep)
What happens is I pick up the phone, have time to say, "Hello?" and have the beep occur shortly after I finish speaking. The beep tells me when the AMD would have started listning-- but since it's past when I started speaking it will only hear silence.
Does anyone have any ideas where/how I've misconfigured Asterisk to have this delay?
SIP call progress analysis is notoriously fickle (it basically doesn't work).
What I've had to do in the past is use a SIP proxy that analyzes the audio in-band, and then passes the result back to Asterisk.
Check out Sangoma Call Analyzer.
I am using URL.openStream() to download many html pages for a crawler that I am writing. The method runs great locally on my mac however on my schools unix server the method is extremely slow. But only when downloading the first page.
Here is the method that downloads the page:
public static String download(URL url) throws IOException {
Long start = System.currentTimeMillis();
InputStream is = url.openStream();
System.out.println("\t\tCreated 'is' in "+((System.currentTimeMillis()-start)/(1000.0*60))+"minutes");
...
}
And the main method that invokes it:
LinkedList<URL> ll = new LinkedList<URL>();
ll.add(new URL("http://sheldonbrown.org/bicycle.html"));
ll.add(new URL("http://www.trentobike.org/nongeo/index.html"));
ll.add(new URL("http://www.trentobike.org/byauthor/index.html"));
ll.add(new URL("http://www.myra-simon.com/bike/travel/index.html"));
for (URL tmp : ll) {
System.out.println();
System.out.println(tmp);
CrawlerTools.download(tmp);
}
Output locally (Note: all are fast):
http://sheldonbrown.org/bicycle.html
Created 'is' in 0.00475minutes
http://www.trentobike.org/nongeo/index.html
Created 'is' in 0.005083333333333333minutes
http://www.trentobike.org/byauthor/index.html
Created 'is' in 0.0023833333333333332minutes
http://www.myra-simon.com/bike/travel/index.html
Created 'is' in 0.00405minutes
Output on School Machine Server (Note: All are fast except the first one. The first one is slow regardless of what the first site is):
http://sheldonbrown.org/bicycle.html
Created 'is' in 3.2330666666666668minutes
http://www.trentobike.org/nongeo/index.html
Created 'is' in 0.016416666666666666minutes
http://www.trentobike.org/byauthor/index.html
Created 'is' in 0.0022166666666666667minutes
http://www.myra-simon.com/bike/travel/index.html
Created 'is' in 0.009533333333333333minutes
I am not sure if this is a Java issue (*A problem in my Java code) or a server issue. What are my options?
When run on the server this is the output of the time command:
real 3m11.385s
user 0m0.277s
sys 0m0.113s
I am not sure if this is relevant... What should I do to try and isolate my problem..?
You've answered your own question. It's not a Java issue, it has to do with your school's network or server.
I'd recommend that you report your timings in milliseconds and see if they're repeatable. Run that test in a loop - 1,000 or 10,000 times - and keep track of all the values you get. Import them into a spreadsheet and calculate some statistics. Look at the distribution of values. You don't know if the one data point that you have is an outlier or the mean value. I'd recommend that you do this for both networks in exactly the same way.
I'd also recommend using Fiddler or some other tool to watch network traffic as you download. You can get better insight into what's going on and perhaps ferret out the root cause.
But it's not Java. It's your code, your network. If this was a bug in the JDK it would have been fixed a long time ago. Suspect yourself first, last, and always.
UPDATE:
My network admin assured me that this
was a bad java implementation Not a
network problem. What do you think?
"Assured" you? What evidence did s/he produce to support this conclusion? What data? What measurements were taken? Sounds like laziness and ignorance to me.
It certainly doesn't explain why all the other requests behave just fine. What changed in Java between the first and subsequent calls? Did the JVM suddenly rewrite itself?
You can accept it if you want, but I'd say shame on your network admin for not being more curious. It would have been more honorable to be honest and say they didn't know, didn't have time, and weren't interested.
By Default Java prefers to use IPv6. My school's firewall
drops all IPv6 traffic (with no warning). After 3 minutes, 15 seconds Java falls back to IPv4. Seems strange to me that it takes so long to fall back to IPv4.
duffymo's answer, essentially: "Go talk to your network admin", helped me to solve the problem however I think that this is a problem caused by a strange Java implementation and a strange network configuration.
My network admin assured me that this was a bad java implementation Not a network problem. What do you think?
I want to write a program that will be able to call into my company's bi-weekly conference calls, and record the call, so it can then be made into a podcast.
I am thinking of using Gizmo's SIP interface (and the fact that it allows you to make toll-free calls for free), but I am having trouble finding any example code (preferably in Java) that will be able to make an audio call, and get hold of the audio stream.
I have seen plenty of SIP programming tutorials that deal with establishing a session, and then they seem to just do some hand waving, and say "here is where you can establish the audio connection" without actually doing it.
I am experienced in Java, so I would prefer to use it, but other language suggestions are welcome as well.
I have never written a VOIP application, so I'm not really sure where to start. Can anyone suggest a good library or other resource that would help me get started?
Thanks!
Look for a VOIP softphone writtin in Java, then modify it to save the final audio stream instead of sending it to be played.
Side note: In many states you would be violating the law unless you do one of several things, varying by state: Notify the participants they're being recorded, insert BEEPs every N seconds, both, etc. Probably you only have to comply with the laws of the state you're calling from. Even worse, you may need to allow the users to decline recording (requires you to be there before recording starts). If you control the conference server, you may be able to get it to play a canned announcement that the call is being recorded.
You could do this with Twilio with almost no programming whatsoever. It will cost you 3ยข per minute, so if your company's weekly call is 45 minutes long, you're looking at $1.35 per week, about as close to free as possible. Here are the steps:
Sign up for Twilio and make note of your Account ID and token
Create a publicly accessible file on your web server that does nothing but output the following XML (see the documentation for explanation of the record parameters):
<Response>
<Record timeout="30" finishOnKey="#" />
</ Response>
When it's time to start the recording, perform a POST to this URL (documented here) with your browser or set up an automated process or script to do it for you:
POST http://api.twilio.com/2008-08-01/Accounts/ACCOUNT SID HERE/Calls
HTTP/1.1
Called=CONFERENCE NUMBER HERE
&Url=WEB PAGE HERE
&Method=GET
&SendDigits=PIN CODE HERE
If you want to get really creative, you can actually write code to handle the result of the recording verb and email the link to the MP3 or WAV file that Twilio hosts for you. But, if this is a one off, you can skip it because you can access all your recordings in the control panel for your account anyway.
try peers with mediaDebug option true in peers.xml. This option records all outgoing and incoming media streams in a media/ folder with a date pattern for file name. Nevertheless this file will probably not be usable as is. It contains raw uncompressed lienar PCM samples. You can use Audacity, sox or ffmpeg to convert it to whatever you want.
https://voip.dev.java.net/
They have some sample code there.