I propose a new question:
I think the communication between android and server by sockets is difficult
I speak with my friends it proposes me a solution: use the GCM
month then give an idea or example uses this concept
I found this book:
http://www.academia.edu/2200380/SENDING_SECURE_DATA_BETWEEN_AN_ANDROID_MOBILE_APPLICATION_AND_A_NETWORK_GROUND_STATION
And the question is, how to use gcm between server and Android?
Communication between android and server is I believe not applicable with GCM, GCM is intended to be a server to client pushing service, for example your wish to tell your client there is some data updates you need to fetch. So your server will push a message to client, using GCM.
For client to server communication, the easiest IMO would be using some Http server or web services. As for securing you can always go for SSL.
Related
Do XMPP Servers such as Openfire require implementation of their own in order to handle messages. Do I need a web language such as PHP in order to handle messages with Openfire?
Because according to posts such as this How to make Chat Application in Android Using XMPP and GCM, I do not need to write PHP scripts in order to handle messages, Openfire (it being a XMPP server) will do all the heavy lifting. So when creating a messaging program is the only thing I need to worry about the client side code?
I've also run into contradictory information that I hope someone can clarify on. It was to my knowledge that one needed to use a XMPP server along side GCM; as GCM is not reliable in delivering messages by itself and requires an XMPP server to fully be reliable. Is this true, the above link suggests that it isn't, but according to this it is https://www.youtube.com/watch?v=5wXGcu9H91s
Some clarification would be great, thanks.
GCM allows you to use both HTTP and XMPP to send messages down from your application server through GCM to your devices.
Only with XMPP though can you send messages from your device through GCM to your server. This allows your device to send acknowledgment messages back up to your server. This does not necessarily make GCM more reliable but it does allow you to have a better audit of what messages were actually received by devices.
Openfire is a server that supports XMPP so you will still have to implement the protocol maybe using Smack.
Note that you could skip GCM and have a connection directly between your app and your XMPP server, however this is not recommended since your app would have to be constantly connected to your server which would be very hard on the battery of the device. This is where GCM comes in, allowing your app to receive messages even when it is in the background but still being kind to the battery of the device.
hi this is just for knowledge. i will try to explain as much as i can what is my question.
Usually i call on an Async Service every amount of time i.e updates on the server part for example are not reflected as soon as they change. whatsapp for example reflects the updates almost instantly. for example when a user is typing, it shows to the other user that he is typing.
In short what protocols do they use and how do they use it.
thank you.
What protocols do they use?
Application like Whats app,G-talk ,facebook etc they uses XMPP protocol for IM services.
What is XMPP?
The Extensible Messaging and Presence Protocol (XMPP) is an open
technology for real-time communication, using the Extensible Markup
Language (XML) as the base format for exchanging information. In
essence, XMPP provides a way to send small pieces of XML from one
entity to another in close to real time
As per latest version of specifications XMPP provides below services
Channel encryption [RFC3920]
Authentication [RFC3920]
Presence [RFC3921]
Contact lists [RFC3921]
One-to-one messaging [RFC3920]
Multi-party messaging [XEP-0045]
Notifications [XEP-0060]
Service discovery [XEP-0030]
Capabilities advertisement [XEP-0115]
Structured data forms [XEP-0004]
Workflow management [XEP-0050]
Peer-to-peer media sessions [XEP-0166]
This are the core services available in XMPP
Below are some Applications where XMPP can be used
Instant messaging
Groupchat
Gaming
Systems control
Geolocation
Middleware and cloud computing
Data syndication
Voice over IP (VoIP)
Identity services
Like HTTP XMPP also require server-client implementation
Below are some popular XMPP servers
Ejabberd
Openfire
Prosody
Tigase
You can find more information on xmpp server on this link
Different platform has their different XMPP client library you can more information on this link
If you want to implement XMPP client for android then you can use Smack 4.1 ,it is an open source XMPP client library written in java.
I have tried to list down basic feature of XMPP here but if you getting started with xmpp ,then there are lost of things to learn , free to ask any doubt regarding XMPP I will try my best .
Thank you
Note::
for the user who are still using aSmack should Upgrade to Smack 4.1 as aSmack has been deprecated!!
aSmack Deprecation Notice
aSmack to Smack Upgrade guide
You could implement the Google Cloud Messaging (GCM) service, as the GCM site says:
Google Cloud Messaging (GCM) for Android is a service that allows you
to send data from your server to your users' Android-powered device,
and also to receive messages from devices on the same connection...
This way you can inform from one client a status change, the backend then send the propper message to the desired clients and finally those clients app updates the status.
https://developer.android.com/google/gcm/index.html
I have a Java based app server and a cordova client. I want to use GCM with the existing cordova gcm plugin code which uses HTTP to communicate with GCM, and use XMPP for GCM communication in my server to make it more efficient. can this be done? I am asking because I get ACKs on my server but no messages arrive to the client.
Thanks.
Found the problem, it was in the client side. The answer is yes, it does work.
I really tried to find a solution to this problem but didn't. There are some threads related to this concept, but I didn't find a comprehensive solution.
I have a server with Openfire which sends messages. When both users are online, there is no problem. However, when a user is offline I would like to send a push notification, as in Whatsapp. I heard that Whatsapp and other IM apps use a modified version of ejabber to send push notifications, but couldn't find out how.
One possibility is to use GCM, but I am not sure if this is the right way to go. Also I would like to avoid polling, for the sake of not draining battery life.
Does anyone know some solution to this or has an example?
I am studying the openfire and found some good options that I would like to share with you.
I found a plugin in github and i will test it this week. It seems that will be a good solution to your goal and to my: https://github.com/meisterfuu/Openfire-GCM/
Another option is to use CallbackOnOffline Plugin that calls a specified URL with To and From parameters. This url could be a endpoint in your web service, and with that data (To and From) you could get the associated Id for push in your base, and did a push.
https://www.igniterealtime.org/projects/openfire/plugins.jsp
Well, you could use GCM with XMPP.
The new GCM Cloud Connection Server allows you to use the XMPP protocol for a bidirectional (Cloud to Device and Device to Cloud) communication between your server and your Android application.
The GCM Cloud Connection Server (CCS) allows third party servers to
communicate with Android devices by establishing a persistent TCP
connection with Google servers using the XMPP protocol. This
communication is asynchronous and bidirectional.
In openfire its done automatically, messages will be recieved by the user when the user gets online. So no worries send message to an offline user and when the user comes online message will automatically pushed to the user.
I am trying to create a chat application. The communication is based on RESTful web services(Jersey). The client communicates with the server sending HTTP requests. My problem is how to send messages from server to client without the client send a request first. I read about C2DM notifications, I suppose using this way, when the client receives the notification from the server then (the client) has to send a request to the server in order to receive the data. I also was thinking about using sockets but I don't know if it is possible as I am using Rest. I mean in the server side can I also use sockets(sockets run in lower level) with the REST code? The only thing I have though that could work using sockets is to create another server with socket(two servers RESTful and socket), but is this a good solution? Also could I put some server code in the client side and some client code in the server side. Would it be correct and effective? What do you think? Which solution would be the best?
C2DM has been officially deprecated as of June 26, 2012 by google. Existing C2DM developers are encouraged to migrate to the new version of C2DM, called Google Cloud Messaging for Android (GCM).
Check out this link for more info
http://developer.android.com/guide/google/gcm/index.html
The scenario you describe sounds ideal for C2DM. If you build your own sockets set up you will drain battery and CPU resources doing something the phone is already doing - maintaining an open socket to receive messages.
C2DM is relatively straightforward to set up, and in my experience is pretty reliable.
This is the best tutorial I have seen on it:
http://www.vogella.de/articles/AndroidCloudToDeviceMessaging/article.html
But you also need to read the official docs:
http://code.google.com/android/c2dm/
Your server-side code will need to send an HTTP request to the C2DM servers to send a message to a device. To tell it where to send the message, your server needs to specify the Registration ID (which represents your app running on one specific device) and so when your app sets up on the Android device, it registers with C2DM, and then needs to send its C2DM Registration ID to your server to be stored, ready to be used to send messages to.