While going through upnp spec I got the following doubts .
Can I define a basic upnp device with all mandatory fields and with no servicelist and
when providing the description xml I will modify my description xml to advertise my service based to different conditions.
eg: services may playmusic OR switch light OR playfootball.
Can i modify the xml per device basis on run time to inlcude completely different and random services?
I hope the description and service xmls are not static .
Just like almost everything else in UPnP Device Arch document this is not 100% clearly defined, but the idea of dynamic device/service descriptions is mentioned:
If a device needs to
change one of these descriptions, it MUST cancel its outstanding
advertisements and re-advertise. Consequently, control points SHOULD
NOT assume that device and service descriptions are unchanged if a
device re-appears on the network, but they can detect whether
descriptions changed if a changed CONFIGID.UPNP.ORG field value is
present in the announcements.
So descriptions are not static, but you do need need to cancel and re-advertize.
That said, abusing this does not sound useful (Why not use separate root devices or at least sub-devices for totally unrelated services) and is bound to lead to compatibility issues.
Related
In Order use a PLC as a Client (formerly “Slave”), one has to configure the PDO channels, since the default values of the manufacturer are often not suitable. In my case, I need the PDOs so send INT valued instead of the default UNSIGNED8 (see. Picture).
Therefore my question: What kind of workflow would you recommend, to map the CANopen Client PDO channels?
I found the following workflow suitable, however I appreciate any improvements and recommendations from your side!
Start by locating the .eds file from the manufacturer. The image show this in the B&R Automation Studio Programming Environment
Open the file in a eds. Editor. I found the free Vector CANEds Editor very useful. Delete all RxPODs and RxPDO mappings that you don’t need.
Assign the needed Data Type (e.g. INTEGER16) and Channel Name (“1 Byte In (1)”).
Add the necessary PDOs and PDO mapping from the database. (This might actually be a bug, but if you just edit the PDOs without deleting and recreating them, I always receive error messages)
Map the Date to the Channels
Don't forget to write the number of channels in the first entry (in this image: 1601sub0)
Check the eds file for Errors (press F5) and copy&paste the eds file to the original location point 1.)
Add the PLC Client device in Automation Studio and you should see the correct mappings.
(PS: I couldn't make the images smaller ... any recommendations about formating this question are welcome!)
I have to create a particular simulation for a college project. The simulation should feature several mobile nodes cyclically switch between 802.11 access point and station modes. While in station mode, nodes should read the SSIDs of access points around them, and then they should change their SSID in AP mode accordingly. There is no need for connections or data exchange between the nodes beside the SSID reading.
Now, I've been through Omnet/Inet tutorials/documentation (all two of them), and I feel pretty much stuck.
What I could use right now is someone confirming my understanding of the framework giving me some directions on how exactly I should proceed.
From what I understand is Inet does not implement any direct/easy way to do what I'm trying to do. Most examples have fixed connections declared in NED files and hosts with a fixed status (AP or STA) defined in the .ini file.
So my question is basically how do I do that: do I need to extend a module (say, wirelessHost), modifying its runtime behaviour, or should I implement a new application (like UDPApp) to have my node read other SSIDs and change his accordingly? And what is the best way to access an host's SSID?
You may utilize two radios for each mobile node e.g. **.mobilenode[*].numRadios = 2 (see also example in /inet/examples/wireless/multiradio/).
The first radio operates as AP **.mobilenode[*].wlan[0].mgmtType = "Ieee80211MgmtAPSimplified" which has to adapt its SSID.
The second radio serves as STA **.mobilenode[*].wlan[1].mgmtType = "Ieee80211MgmtSTA". Now, you have to sub-class Ieee80211AgentSTA which handles the SSID scanning procedure and has to change the first radio's SSID upon new SSID detection. Then you utilize the adopted sub-class within the simulation. Finally, active scanning has to be activated **.mobilenode[*].wlan[1].agent.activeScan = true.
Part of my task is to make a system that simulates dictating and sending a text message using Vocon.
I tried using the <...> aka "garbage" rule like this:
#BNF+EMV2.1;
!grammar messageInput;
!start <messageInput>;
<messageInput> : cancel | <...>;
Unfortunately that means I don't get what was said, but rather I get the "<...>" as a result.
How can I make Vocon listen to any speech, but report back to me what was said?
(If the changes need to be done in the C code rather than the speech input grammar, I'm also interested in that)
I asked Nuance tech support 5 days ago and finally a couple of hours ago, here's what they answered:
What you described (returning any spoken text) is dictation -- not
grammar-based speech recognition.
To perform dictation with Vocon Hybrid, you use the server-based or
cloud-based service via the NMSP or HTTP interface.
Please search for "dictation" in the Vocon Hybrid 4.8 documentation.
So summarising, it is not possible to do it the way I was intending to; it requires a different mechanism.
I have just started on libusbdotnet. I have downloaded the sample code from http://libusbdotnet.sourceforge.net/V2/Index.html.
I am using a JetFlash 4GB Flash drive (a libusb-win32 filter driver was added for this drive).
The ShowInfo code works perfectly, and I can see my device info with two endpoints. Following is the device info from pastebin
http://pastebin.com/2Jdph6bY
However, the ReadOnly sample code does not work.
http://pastebin.com/hNZaEt8N
My code is almost same as that from the libsubdotnet website. I have only changed the endpoint that UsbEndpointReader uses. I have changed it from Ep01 to Ep02, because I read that the first endpoint is a control endpoint used for configuration, access control and similar stuff.
UsbEndpointReader reader = MyUsbDevice.OpenEndpointReader(ReadEndpointID.Ep02);
I always get the message "No more bytes!".
I thought that this is because of the absence of data, so I used the ReadWrite sample code.
http://pastebin.com/NiN5w9Jt
But here I also get "No more bytes!" message.
Interestly, the line
ec = writer.Write(Encoding.Default.GetBytes(cmdLine), 2000, out bytesWritten);
executes without errors.
Can pen drives be used for read write operations? Or is something wrong with the code?
A USB thumb drive implements the USB mass storage device class, which is a subset of SCSI. The specification is here.
You're not going to get anything sensible by just reading from an endpoint - you have to send the appropriate commands to get any response.
You have not chosen an easy device class to begin your exploration of USB - you may be better starting with something easier - a HID class device, perhaps (Mouse/Keyboard) though Windows does have enhanced security around mice and keyboards which may prevent you installing a filter.
If you meddle with the filesystem on the USB stick while it's mounted as a drive by Windows, you'll almost certainly run into cache-consistency problems, unless you're extremely careful about what kind of access you allow Windows to do.
I have set up a Content Type Hub and tested the syndication is working correctly by creating a test content type and watching it be published to the client site.
Then I deployed the content types I am actually interested in publishing to the hub (by way of a feature) along with the site columns they depend on.
I get the error
Content type '...' cannot be published to this site because feature '...' is not enabled.
I want to deploy content types with features for upgradability and ease of porting between dev, qual and prod environments. But am left not understanding what the benefit of the Hub is.
If I have to activate the deploying feature, the content types will already be on the site before publishing will take place. If I have to manually create the content types on the Hub site with the web UI (yuck!), I have the issue of trying to keep three landscapes manually synchronized.
Is there a way to efficiently manage content type deployment to the Hub while still using the Hub to publish the content types?
The advantage of using the Content Type Hub, is that it allows you to use and reuse your Content Types over multiple site collections and Web Applications throughout your farm.
Because all of your site collections are now using instances of the same syndicated content types, if, in the future, you need to add/remove/rename columns within the content types, this is done as easily as updating the content type, and resubscribing (then allowing sharepoint to run its timer jobs, and double checking that the changes updated because you're a careful SharePoint administrator).
I am not sure which error you are receiving, there simply isn't enough context in your post. However, I think you may be slightly confused on how syndicated content types are published. First, you turn on the content syndication hub publishing feature on the site collection that holds all of the content types you are going to reuse throughout your farm. Next you configure the mixed metadata service, so that SharePoint loads each of your content types "into memory" more or less.
After this step, you get to choose which site collections you want to subscribe to the syndication hub. To do this, you need to turn on the content type publishing site collection feature. Note: If you use blank templates for your sites you may receive a feature error like you've described, due to a "flaw" with blank templates. See my post at: http://www.thesharepointblog.net/Lists/Posts/Post.aspx?ID=109
Only AFTER you've turned on the subscribing feature, And content Type Hub timer job has run, AND the subscribing timer job has run, will your site collection see the available content types.
As for manually creating content types on the hub site, the only OOB way of doing this is to use the UI. Personally, I wrote a utility that does everything I just described for me, from creating the initial content types, to creating the syndication hub, publishing them to all of the site collections, and most time consumingly, associating them with all of the lists and libraries on the subscribing site collections. I had intended for my employing company to sell it, but as they don't seem interested, I could open source it if there is enough interest.
Hope this was helpful.
This looks like a shortcoming of the hub, indeed.
I've witnessed it before.
If you've deployed your content type to the hub, please check if the INHERITS tag of the content type element is set to TRUE. Otherwise it won't work in a hub.
<ContentType ID="xxxxx"
Name="xxxx"
Group="xxxx"
Description="xxxx"
Inherits="TRUE"
Version="0">
</ContentType>
Don't forget that you can actually synchronize the content types BETWEEN farms -- this is especially valuable when you are developing on a separate farm and don't want to hassle with a PnP Framework for managing your content types... In some cases, the Content Type may already exist on the production farm and you need a copy of them on dev and/or test..