I would to develop an IoT mobility project project using fi-ware.
My intention is to deploy a lot of sensor on the taxi/bus
in the city to control air quality.
I want to use IDAS GEi, but i have some questions:
I must use a linino board as gateway for my sensors.
How can i send observations or receive commands from
linino to IDAS and viceversa? I have found on the web this
tool: figway. I have read figway is used as communication
gateway between raspberryPI and IDAS.
So i have thought to adapt figway for linino. Is it the correct way
to reach my goal? Are there better ways to do that?
Furthermore, i should provide discovery mechanisms and a transparent
interface to control the sensors. For example, i should provide to the user
the possibility to find the sensors, that provide a data measure, in a certain place.
I would to use SWE for that. Is IDAS swe compliant? I have read in the documentation
IDAS uses swe data model, sensorML, O&M but i have not found anything about
SOS/SAS/SPS/WNS services.
Has IDAS discovery mechanisms? Maybe i must use other GE to do that (Configuration Manager?)
Figway is just a python example of how you can make the queries to the Ultralight 2.0 IoT-Agent.
You may port Figway to your new platform if it supports python or, alternatively you can check the HTTP POST requests to code at any other platform/language.
It is really easy, have a look at: http://www.slideshare.net/FI-WARE/fiware-iotidasintroul20v2
Additionally, do not forget that Ultralight2.0/HTTP is one of the technology options that we support for IoT. If your devices are to use other standard such as MQTT/TCP or LWM2M/CoAP/UDP you can check other IoT-Agents (that connect as well to the same Orion contextbroker):
UL2.0 and MQTT are here: https://github.com/telefonicaid/fiware-IoTAgent-Cplusplus
LWM2M is here: https://github.com/telefonicaid/lightweightm2m-iotagent
Also, if you want to use any other standard (or even your own propietary protocol) you may build up your own IoT Agent using the skeleton provided here:
https://github.com/telefonicaid/iotagent-node-lib
Thanks for using IDAS!
Cheers,
Related
I read "Those who would like to enjoy the binding, presentation model structuring, testing capabilities, toolkit independence, and all the other benefits of OpenDolphin, but prefer REST (or other) remoting for data access, can use OpenDolphin with the in-memory configuration"
But I could not find any further hints in the docs?
I can't rely on sticky sessions in my load balanced webserver.
Therefore I need to plugin something different for the http session state.
Is there a opendolphin config property prepared for this? If not are there any plugin points available?
since OpenDolphin and Dolphin Platform use the remote presentation model pattern to synchronize presentation models between client and server you need a state on the server. Currently this state is defined in the session. As you said it's no problem to use load balancing with sticky sessions to provide several server instances. If you need dynamic updates between the clients a distributed event bus like hazelcast will help.
Therefore I need to plugin something different for the http session
state.
What do you need? With the last version (0.8.6) of Dolphin Platform you can access the http client in the client API and provide custom headers or cookies. Will this help? Can you please tell us what you need or open an issue at the Dolphin Platform github repo?
Problem Set
Assuming an application with two networking classes (these are the backend for every outgoing and incoming network connection of the application), I would like to monitor the network load created by the application itself in Python 2.7.
Already did multiple searches on SO and the Net but did not get the results or ideas i was looking for.
I would like to achieve the solution without 3rd-party application dependencies (such as Wireshark or similar products as I am not in control of end-user OS. Application shall be 100% Cross Platform).
networking classes:
mysql-Driver based on mysql-connector-python.
"general" networking class to check availability of hosts using socket library shipped with python
Question(s)
Are there python libraries that can achieve this without any 3rd party product beeing installed?
is the approach so off that another approach should be much easier / more likely possible?
I'm planning to build an application that runs on WEB(AngularJS), Android(Native), IOS(Native).
I have experience with MongoDB, but I found CouchBase which sounds really good for me.
I read documentation and I found out I need to use sync_gatway to sync my mobile databases with main database server and reverse, until now everything is fine.
I also need to use "channels" to share records with multiple users.
The problem comes when I need to implement this for web application.
In their documentation on "Working with web applications" they explain how "bucket shadowing" is working, but they also say:
Bucket shadowing is meant to enable sync for existing Couchbase Server
apps. If you are creating a new app with both mobile and web clients,
we recommend starting with the Sync Gateway REST APIs, and connecting
backend services using the Changes Worker Pattern.
After reading Sync Gateway REST API I found out I'm limited to facebook and persona authentication. So I can't use my own authentication mechanism?
Also, there is nothing specified in REST API about channels?
Is there any example project or more documentation about this? I couldn't find anything :(
If someone has experience with this, please explain how this works.
Thanks
There is also Custom (Indirect) Authentication available on Sync Gateway, which you can use for any type of auth you need.
But you have to hide Sync Gateway's Admin API under your backend layer.
As for the channels: it is responsibility of Sync Function to route different documents to necessary channels based on Document data.
Here is a good video that describes how to build production architecture around Couchbase Lite.
I'm probably late for the party - but as of today I'd recommend taking a look in the PouchDB project for the WEB AngularJS side - they match pretty well and will sync with Couchbase.
Regarding authentication, I just released an article on that topic, find it here. Hope this helps somebody
Can anyone give me a brief rundown of how Facebook and Google Talk work, are there persistent connections involved similar to the classic Java based chat systems whereby a server manages the connections and directs messages to the necessary destination or are they stateless? I'd like to create something similar to these but I'm not sure where to start and if I need to have custom services running on a server I may have to rethink my approach.
I'm not after a full-blown explanation but I am interested to know if there's a stateless approach that doesn't require services running on a server. If Html5 is required that's ok.
Both use the Jabber protocol: http://www.jabber.org/
Can anyone explain at a beginner-intermediate level the terminology of "bus", "transport" and "endpoint" in the context of an enterprise service bus? I'm a C# developer with a few years experience now, but only just starting working with an ESB.
It seems that the "bus" is effectively a queue to which you can send and receive messages. I'm fine with that. However I'm working on some existing code using NServiceBus and I think if I grokked the "endpoint" and "transport" terminology I'd make a massive leap forward in my understanding.
Let me try to clarify those terms to you:
Bus in context of ESB architecture should not be considered as simple queue for message dispatching. To allow integration of different services, ESB provides much more. Important additional functionalities of ESB:
Routing. Messages can be routed to different services, depending on message content or endpoint specification.
Message Transformations/Mediations between different formats
Transport protocol conversion. ESB should be able to seamlessly integrate applications
that use different transport protocols (JMS, HTTP/S, pure TCP, etc.)
Message enhancement. Messages can be enriched with missing data before further processing.
Security
Management and Monitoring
Those functionalites are provided by services that operate within ESB. Services connect to each other via endpoints - uniform, unique "addresses". Messages dispatched between endpoints are using unified transport (method/protocol that encapsulates message's payload). Application that natively use different transport, need to connect to ESB via suitable adapter - service that will provide necessary transport conversion. This way applications that use ESB are decoupled from each other and don't need to provide conversions themselves.
Of course, those are only very brief descriptions of terms. Remember, Enterprise Service Bus is only catch-term for specific kind of architecture (or concept), but it is not standardized in any way. So specific implementations can be very different from each other.
If you are interested in standardized ESB, you can take a look at JBI (Java Bussiness Integration). There are several open-source implementations of JBI avalable, among them Apache ServiceMix, Mule, OpenESB. Very good introduction to ESB technologies is presented in "Open Source ESBs in Action" book published by Manning.
I would recommend looking at resources related to Enterprise Application Integration (EAI), which revolves around the ESB and various models and patterns used to integrate solutions. Think of it is a GoF for ESB architectures:
http://www.enterpriseintegrationpatterns.com/
and
http://www.enterpriseintegrationpatterns.com/toc.html
All of these patterns would give you an idea of what people use ESB's to achieve and the patterns are useful for providing common pitfalls of do-it-yourself ESB integration. I've learned an immense amount through that book and through people that source from it.