I am new to the arduino platform.
I want to use REST api for communication between my web server and GSM/GPRS.
i have already created a REST api for communication between my android app and web server, but now i want to fire the same REST api(GET request) using GSM/GPRS client in arduino and want to read the response from the server.
FYI i am using arduino uno for atmega328-pu.
I tried searching in the web but ultimately ended up getting nothing useful.
Any help will be highly appreciated.
Thanks in advance.
From what you write, it is not entirely clear if you want to use the Arduino as a REST client or server. For setting up a server on it, your best bet will be to use the Webduino library that implements GET and POST methods.
Depending on the type of networking hardware (Wifi, Ethernet) you are using, there will be an implementation of the "Client" interface that you can use for sending HTTP requests. See this example for the Ethernet client: http://arduino.cc/en/Tutorial/WebClient
The code for the GSM client is in the GSM library, that you can find here: http://arduino.cc/en/Reference/GSM
There's also a sample for using the GSM client: http://arduino.cc/en/Tutorial/GSMExamplesWebClient
Which GSM/GPRS shield are you using? If it supports the official GSM library you can use that or if it is a Seeedstudio GPRS Shield use my GSMGPRS_Shield. Anyway then use my fork of arduino-restclient or modify it if you use the default GSM library.
Let me know if that helps you. Otherwise I have some more examples etc I can post.
Related
I have to do a simple iPhone project as part of an university exam which consists in creating a simple instant messenger based on a client/server system using the Java Servlet technology (required).
What I would like to know is if there is a framework or some simple classes that make me able to listen for incoming http message from a server without make a request so that an iPhone can send directly to another iPhone an instant message.
Thanks in advance and have a nice day!
L.
From what I understand from your question, you need a listener. There are several 3rd party implementations that provide what you need. Basically you just need to open a socket for listening on a HTTP server running on your iPhone.
Try these, it should provide you with what yo need
CocoaHTTPServer.
MongooseDaemon
If youre looking for a way to receive message from WEB server - you may use Apple Notification service (here`s a good tutorial)
Another way is to use long-poll connection, but is not an easy thing to implement in IOS.
Maybe you can check for incoming message by requesting web server from iPhone (ex. every 10 seconds)?
I am looking for advice on protocols for use in LAN comms between an iPhone and an embedded Linux device. The embedded Linux device requires the following functionality...
Connectible to Wireless LAN.
Discoverable as a device on the Wireless LAN.
(Virtually) connectible with iPhone.
Remotely Callable API provided to the iPhone.
Able to remotely call back functions on the iPhone.
I am looking to use platform independent protocols to achieve this functionality because the mobile application will be ported from the iPhone to other mobile platforms like Android. Since I am a newbie with Embedded Linux, my research (and possibly naivety) suggests that said functionality could be realised with the following protocols...
DHCP for obtaining dynamic IP address.
DNLA? (Bonjour is native to iOS right?)
Connection-oriented communication implies TCP.
SOAP or REST architecture on HTTP.
SOAP or REST architecture on HTTP.
Can you suggest other, more suitable protocols? Am I barking up the wrong tree? Is there a much more simple way I could achieve this functionality? For example, providing the remote API using only a TCP socket?
Any advice you can offer is welcome...
Look into 0mq. It's a scalable messaging library that provides a message queue without requiring a message broker.
-Has objective-c bindings to help you implement in iOS
-Has java bindings to help you implement in Android.
-Small footprint.
I did something similar - an Arduino that streams data to an iPhone app connected over WiFi using the UDP protocol.
I'd like to play with the idea of creating a server program that communicates with an iPhone app over socket connections. I've found several guides within Apple's documentation for client side programming (with CFNetwork, NSStream, etc) but I don't know where to begin on programming the server application, or even what language to use, or for that matter, how to deploy and run a server application on my current web hosting package through Go Daddy. A simple instant messenger style application example should get me started, but any advice is appreciated.
if you want to create socket connection is better to use CFNetwork , it has more flexibility for you I already used NSURLConnection but CFNetwork has better performance. this is my steps and how I developed my app :
configuration of server
selection C++ for my server side (service)
start to develop a client-side app for iphone to connect to server using NS classes
but I had some problems in sending and receiving message to and form server . so I changed it to CF classes it works better and faster now.
The easiest way to handle server-to-device communications is to use APNS (Apple Push Notification Services).
Communication in the other direction (device-to-server) can be handled simply with NSUrlConnection.
If you want to write your own socket code for this, well - good luck with that.
Do you want your client application to be able to run on more than one OS? If so, you might want to stay clear of anything Apple specific. Although, if you strictly want to run on iOS, using MusiGenesis' suggestion could save you a ton of time.
I have found that Python and Perl are both pretty great for socket programming. I know that Python has several libraries built in for handling HTTP requests etc. If you want to run your server as a daemon, I found this code very helpful:
http://www.jejik.com/articles/2007/02/a_simple_unix_linux_daemon_in_python/
Here is a general python sockets guide:
http://docs.python.org/howto/sockets.html
Good luck.
I wanted to add a voice chat feature to my business app. I have been trying hard to find anything useful but there is not much help regarding this. Could anyone plz point me to something concrete??
PS: The skype app makes use of this feature.
This is a lot of work as there is no "built in" sdk features or third party off the self components that will help you do it without a lot of work on your end.
Your options (as far as I know) are:
Build your own solution.
Look for a third party solution.
Look for a open source solution.
Voice "chat" could be one of many things like:
using the voice features of a cellular network to a conference call.
using the voice features of a cellular network with a PBX server that supports conference calls.
using a VOIP solution using a SIP stack with a SIP server
using a XMPP Jingle solution (I believe the google voice service uses this)
using your own SIP setup solution
custom solution
None of these options are easy.
Open Source SIP implementations that have iphone ports (that I know of):
reSIProcate
pjsip
Update:
SIP & Jingle both use RTP for the actual transport protocol between the parties. RTP is a UDP point-to-point protocol. The ports which form a session are negotiated using other protocols such as RTSP (using SDP in the setup method) and SIP. RTP and RTCP typically use unprivileged UDP ports (1024 to 65535).
For easy Server / Client setup check Jingle Nodes in combination with SIP Communicator which is a Desktop application. But as being opensource I presume you can reuse a lot of the code to make it mobile. Specially for Android. Check this draft of a Jingle Nodes Setup Guide
I am a new programmer who is new to iPhone development and server stuff. I have a lot of questions to ask.
You don't have to answer all the questions; any help is appreciated!
How does iPhone apps interact with server?
Is there a particular kind of server i should use to interact iphone app with server?
If there is no particular kind of server then what kind of server can be used?
What are their advantages and disadvantages?
What should the iPhone app (which is the client) do in order to interact with the server?
How does the server know which iPhone to send data to?
What should the server do in order to interact with iPhone app (client)?
Your best bet is to have your iPhone make web requests of a web server. Your iPhone app acts just like a web browser, making http requests to a web server, and parsing the response.
I'm building an app right now that hits PHP scripts I've written that do database work, etc, and return JSON objects. It's not fancy--I could have built a whole SOAP or RPC web service, but I didn't do that, it just makes GET requests with query-string arguments.
There are handy libraries you want to know about. Google "iPhone JSON" to find the JSON library written by Stig Brautaset, that's the one most people seem to be using. Also, rather than putting yourself through all the hoops that the iPhone's built-in web client framework requires, go get ASIHTTPRequest, a very powerful and MUCH simplified web client library.
As a general rule, you want to do as much processing on the server as possible. For instance, there's a place in my app I'm searching for events happening within a user-specified range of their local coordinates ("within 10 miles of me"). I wrote PHP to build a latitude/longitude bounding box, and query from the database based on that. That's WAY faster than bringing a bunch of events down and then asking Core Location to calculate their distance from where I'm standing.
You've asked quite a few questions so I'll try my best to answer them all:
First, you need to be a bit clearer, what type of server are you talking about? Email server, web server, lolcat server, it depends.
At the basic level, the iphone communicates over the internet. The internet uses Internet Protocol, and there are two standard protocols built atop of IP: Transmission Control Protocol, and User Datagram Protocol. Each has it's own uses and functions.
TCP/IP and UDP/IP make up the backbone of internet communication.
A more specific application protocol is built atop of these two internet protocols, with a specific format to a given application. For example, HTTP is the standard protocol for transferring HTML and other Web information between a web server to a web browser client, over TCP.
So, your iPhone would use whatever protocol is required to commuincate with the server. For more common server communication, the iOS SDK provides methods to construct messages (for example if you wish to make an HTTP request to a web server, you can use initWithContentsOfURL to send a GET request).
If you built a custom server, then you will need construct the required message protocol on the iphone, and send it to the server, using either TCP or UDP (whatever your custom server expects).