Just curious, why does the MasterDriver agent publish the same point with two different, but similar topic names? For example "devices/campus/building/bacnet1/OCC_COOL_SP" and "devices/OCC_COOL_SP/bacnet1/building/campus". Are both topics needed?
This feature was originally intended to make writing agents that did automatic discovery easier. If you wanted to find all the devices that had an OAT point (or whatever) you could subscribe to "devices/OAT" and get the value of the OAT point on every device.
In practice about the only publishes anyone uses are the depth first "all" publishes.
You can read about all the different publish types here: http://volttron.readthedocs.io/en/develop/core_services/drivers/Driver-Configuration.html#device-state-publishes
You can shut off the ones that you don't use by changing the settings described here:
http://volttron.readthedocs.io/en/develop/core_services/drivers/Driver-Configuration.html#scalability-settings
Those settings go in the individual device configuration and are set per device.
In the future we may set the default value for publish_breadth_first_all, publish_depth_first, and publish_breadth_first to False.
Edit
I should also mention that all historians rely on the depth first all publish to do their work. If you shut that off all historians will stop collecting data.
Related
This is my first time getting into drones.
I am looking at DJI drones, currently as it seems most promising from a documentation and reviews point of view.
Basically, I would like to program a drone(s) to fly a certain pattern and take pictures when a certain criteria is met. For example, I would like the drone to take off and fly around a small park, stopping to take a picture of each tree it encounters, automatically (auto-piloted / driven by some "AI").
Now I glanced thru the DJI SDK documentation, and so far it SEEMS this is possible (via FlightControl class). But im not sure.
Question:
Can my requirements be met with current drone SDK technologies?
Yes, the correct SDK, 4.11.1 will do everything you mentioned. You will need to do some location calculations but that's about it.
The sample will almost do everything you want as-is, with minor changes.
With the DJI Mobile SDK you can use the Mission classes to automatically fly a given set of coordinates (waypoints) and do some actions once you arrive at a waypoint, e.g. take a picture.
However the SDK has limitations:
The SDK is unable to detects objects in the video stream. Therefore it is needed to use your own code to detect objects yourself.
The way the drone flies to the waypoint is quite limited, e.g. the drone will always face the camera in the direction of flight.
When using the DJI Mission classes, a change of the route during execution is only possible with the use of timeline Missions by adding timeline elements to the list.
As you already assumed in the comment: Yes, the Mobile SDK is more advanced than Windows SDK.
I'm building a vClould client application via the REST APIs, however, the documentation is inconsistent an in some cases just wrong and misleading.
All I really need is a solid debug tool or even a log file. Any recommendations?
You already mentioned you have access to the message stream, which is one of the first steps. Typically if I'm using the Apache HttpClient/HttpComponents I'll go increase the log level so it logs the full HTTP requests.
My next step is usually to cheat and to log into vCD as a system administrator and see what's going on. When vCD was designed there was a very deliberate decision to not reveal infrastructure level problems to tenants of the cloud (normal org users or org admins), as that would break the cloud abstraction. Sadly, that means as an org-level user you're often going to get "contact your cloud admin" error responses. We are aware that this isn't ideal and try to find ways to make it better when we can (IIRC the new 5.5 release that was announced last month does have some improvements in that area).
The last step is usually to cheat even more and to look at the server side logs (vcloud-container-debug.log, specifically). That usually gives me a better clue as to what went wrong. Of course, you may be unlucky and not have access to the vCD cell machine.
My workaround in the latter two cases is to try the operations via the vCD UI and see (1) if they work as expected and (2) if they do, to check the system state via the API and see if I'm sending the wrong request payloads, etc. because the doc or schema reference may not have been clear enough.
In regards to the documentation, please use the feedback links () found on individual doc pages to let us know! Our technical writer reviews all the feedback and tries to address them.
My final suggestion is that you might want to post API questions to the vCloud API community forum VMware has. There are a number of experts (both users and VMware employees) that monitor it and respond to questions.
I'm concerned - when I take a picture, I usually (ie, last week) am able to share the image to my app.
Now, however, only Google + contacts appear as share targets. For example, if I turn off sharing to G+, I get no Share options at all, only a greyed-out Share dialog that says "Visit google.com/myglass to add friends"
However, when I go to that address I clearly see my app and a number of contacts (who aren't in G+) who also usually show up.
Has something changed to cause this behavior? For example, is the code listed in the starter-project no longer sufficient to register a share target for photos?
For example, I could imagine that suddenly the acceptTypes[] parameter was now mandatory. But I'd love to hear someone closer to the API weigh in, if possible.
Thanks!
AKA
I solved this by following Alain's comment's advice.
It's very easy to think that the "Contacts" page you see at https://glass.google.com/myglass is all there is.
But if you want your app to receive shared stuff, you have to go here: https://glass.google.com/myglass/share
I'm stumped and need some ideas on how to do this or even whether it can be done at all.
I have a client who would like to build a website tailored to English-speaking travelers in a specific country (Thailand, in this case). The different modes of transportation (bus & train) have good web sites for providing their respective information. And both are very static in terms of the data they present (the schedules rarely change). Here's one of the sites I would need to get info from: train schedules The client wants to provide users the ability to search for a beginning and end location and determine, using the external website's information, how they can best get there, being provided a route with schedule times for the different modes of chosen transport.
Now, in my limited experience, I would think the way to do that would be to retrieve the original schedule info from the external site's server (via API or some other means) and retain the info in a database, which can be queried as needed. Our first thought was to contact the respective authorities to determine how/if this can be done, but this has proven to be problematic due to the language barrier, mainly.
My client suggested what is basically "screen scraping", but that sounds like it would be complicated at best, downloading the web page(s) and filtering through the HTML for relevant/necessary data to put into the database. My worry is that the info on these mainly static sites is so static, that the data isn't even kept in a database to build the page and the web page itself is updated (hard-coded) when something changes.
I could really use some help and suggestions here. Thanks!
Screen scraping is always problematic IMO as you are at the mercy of the person who wrote the page. If the content is static, then I think it would be easier to copy the data manually to your database. If you wanted to keep up to date with changes, you could then snapshot the page when you transcribe the info and run a job to periodically check whether the page has changed from the snapshot. When it does, it sends an email for you to update it.
The above method could also be used in conjunction with some sort of screen scaper which could fall back to a manual process if the page changes too drastically.
Ultimately, it is a case of how much effort (cost) is your client willing to bear for accuracy
I have done this for the following site: http://www.buscatchers.com/ so it's definitely more than doable! A key feature of a web scraping solution for travel sites is that it must send you emails if anything went wrong during the scraping process. On the site, I use a two day window so that I have two days to fix the code if the design changes. Only once or twice have I had to change my code, and it's very easy to do.
As for some examples. There is some simplified source code here: http://www.buscatchers.com/about/guide. The full source code for the project is here: https://github.com/nicodjimenez/bus_catchers. This should give you some ideas on how to get started.
I can tell that the data is dynamic, it's to well structured. It's not hard for someone who is familiar with xpath to scrape this site.
I am researching methods for detecting mobile devices. Let me preface this by stating that I already know about the WURFL file. One of the other options I am considering is maintaining a list of 'User Agent' header values in-house.
Has anyone seen these header values change for a specific device? I know new ones will pop up as new devices hit the market, but I am more concerned with existing values changing on me.
It is not clear what you are asking but; if a device/phone already on the market no it wouldn't change largely but you should expect change as phone/device gets service updates.
goog think about is WURFL that it will try to match the device to a more generic model.
There may be 5 different iPhone 3 S but WURFL would match all as iPhone 3 S
It is hard work to maintain your own user agent list on your own.