I want to start a small project with my arduino. The idea is to have this communication flow:
arduino <-> wireless board <-> Wi-Fi router <-> Web Server <-> Ruby on Rails 3 <-> Smart Phone <-> Browser
I found a framework called RAD (Ruby Arduino Development) but the last update is from 2008. Does anyone know another option to this?
The WiShield has libraries that can talk basic TCP/IP. The source code has an example HTTP client. This can be used as a basis for a client that makes requests to a rails server.
The WiShield seems to be available in a bunch of places.
You could send sensor values through the internet via an Ethernet shield like the ENC28J60 with the EtherCard library. Then you could make an RESTful API on your Rails app (e.g. with Grape), and from the Arduino shield, send the info to this API using the EtherCard library that I suggest.
If you want to use wifi capabilities, the concept it's the same, but instead of use an Ethernet shield, use a wifi shield like this.
Here you have an example to do it with an Ethernet shield.
Related
I want to capture and send some packets to the access point for testing purposes. I have the packet captures made via wireshark but I do not know how to proceed to be able to send these packets from my macbook.
I tried things like scapy, colasoft etc, but they do not seem to work as they require an external wifi adapter to be able to relay these packets outwards.
Two main questions:
Is it possible to send custom packets from macbook to a required access point. (Without using external network adapter).
If yes, what are some tooling/Scripting options that I can look at ? Any recommendations?
I am networking novice so please pardon me if the question is trivial. Thank you!
Your builtin Wifi adapter likely does not support Wifi injection.
You can check this by googling the Wifi chip that is within your computer (there are various methods to get that info depending on your OS) whether it supports Wifi injection or not.
So yeah, you'll likely need an external card (check the specs before buying it)
Hope u guys are doing great.
I want to make a realtime turn based game in iOS .
I know this can be achieved by using GAME CENTRE in iOS , but i have to play this between browser and iOS app. WEB TEAM is using node js for making this game on web browser , they also suggested me to use node js in iOS game as well.
Have anyone has idea how to use node js for this kind of purpose.
Thanking you all! :)
You can have websocket server written in node js and then just connect to it from your ios app using some websocket library (hope it exists). Then sockets connected from browser and your app can realtime exchange information.
You could use a pub/sub messaging service like Realtime (the company I work for) http://framework.realtime.co/messaging/
Both your node.js server and your ios devices could exchange data through Realtime pub/sub channels, using the node.js and ios SDKs.
The cool part is that since it's a managed service you don't need to worry about the server and networking administration, Realtime will take care of that for you.
I'd like to add some words in favor of #Edgar's answer.
For production, using only WebSocket is not reliable. In environment where WebSocket is not available due to antivirus, enterprise firewall, and so on, a kind of full duplex connection over HTTP should be available utilizing long polling or streaming in terms of reliable real-time connection.
Also such connection might be disconnected for a while e.g. moving away from Wi-Fi zone and then some messages which had to send through that connection may be lost so that a way to recover such messages is required e.g. here is some messages you couldn't receive.
Therefore, you need a reliable framework to write such real-time web application. Here's features which are required to write a real-time web application I think. (It's called Cettia and I'm the author of that project. As it doesn't provide iOS client, it's not right choice for you here. Just focus on features and roadmap to see what features you may be needed and evaluate a framework you will choose based on them.)
On Node.js world, socket.io framework has a great community so I'm sure someone already wrote iOS client for socket.io. Anyway, make sure that the framework you finally chose has features you need to write your real-time webapp.
By means of being thorough i was wondering if someone could tell me if I need an ethernet/wifi shield to be able to use POSTGET requests using my arduino.
I've got an NFC shield and I need to send the data stored on the tag to my web server.
You can't do it directly, but if you're planning to use USB, you can
send data using the various serial commands to the PC you're connected
to. You'll need a program written in your language of choice on the PC
listening to the arduino and that program can submit your GET request
for you.
Or in other words, you can fake it, but an ethernet capability would
probably be better & easier.
Copied from a post I found in the Arduino forums
I have an embedded device that can be controlled by JSON over UDP. I am currently performing this via an iOS App, and everything works great.
I am now wanting to be able to also control my device from a remote location. And am wanting to use Azure to perform this task. I envision that I will set up an Azure Website which will enable me to select options which then send the JSON to my device, which is behind a firewall.
My question is which of the Azure Services should I be looking into? Also, what is the best way to get the JSON packet to the device behind the firewall (I do not want to use port forwarding).
In general, to avoid an attack surface from outside your LAN (where you have your embedded device), the better solution is to open and output connection from embedded device to the cloud and to leave it open so that it can send and receive data/command.
In this case, on Azure you can use the Service Bus (queue, topic/subscription or event hub) to send/receive with AMQP protocol but it is strictly related to your device and capabilities.
Can you share more information on it ? How much it is a constrained device or a more power device with an high level OS (Linux, Windows, ...) ?
Paolo Patierno
About using Amqp on devices running android is very tedious. The java implementation in dalvik is missing a lot of required apis to be there.
By the way, do you know where we can find information about related path segments to use in amqp pure syntax in Azure, to interact with IoT-Hub end-points. Like for queue for example, we can have :
amqps://:#.servicebus.windows.net/
Thanks
Quite a lot of webpages address this issue but I cannot find a simple (I am a begginer) explanation about how to setup a connection between iOS device and Mac computer. I read things about sockets and service publishing with Bonjour and the Apple documentation but it is quite heavy to understand since there is no tutorial and examples.
Does anyone know how to get the basics to setup a connection and send one file over the network or have a good tutorial to share?
Bonjour provides a way for applications to advertise their services and other applications to discover the advertised services.
The main components of a service are
the address (e.g. 10.0.1.52 in the local domain 10.0.1.1)
the type (e.g. Apple Filling Protocol "_afpovertcp._tcp")
the name (e.g. JustinsMacbookPro.local)
the port (e.g. 5687)
These components provide all of the necessary information for a "browser" to figure out how to network with the other application (e.g. setting up the network sockets).
However, Bonjour does not provide a way to send data. Applications send data to other applications using sockets. If you don't want to directly use sockets then you can use high-level protocols that are built on top of sockets like FTP, HTTP, etc. I recommend giving Beej's Guide to Network Programming a read if you want to learn the basics of sending and receiving data over a network.