Hallo, developing a bb app I need to make http connections to get files, images etc.
In simulator all works, but not in device.
I bought a BlackBerry but I want to test my app without a sim then without a bes.
How do I need to set my device? and how do I have to compose my url?
I just have a bb device with wifi available
Thanks all :)
Sergio
As answered for this duplicate question...
This was a tough one for me!
As Mark said you have to put some parameters in the url to make it work on the device. You shouldn't do it by hand but use the ConnectionFactory instead.
As you may thing this would just make it work but it doesn't!
The real problem is that not the url has been altered because it has ;interface=wifi;deviceside=true in it (in my case). Depending on the webserver accepting your request this could broke the code.
A solution I tried and that works is try to happend a fake parameter like
&foo=true -> &foo=true;deviceside=true
This will result as a standard parameter for the webserver but your device would use it to driver your connection.
On the simulator this work without this extra code because behind it there is a BIS server for you. On the device (as in my case) there isn't because I'm using a development device unregistered and without SIM (just wifi).
Another point is that the HttpConnection class doesn't handle HTTP 302 Redirect and if you get one you have to handle it manually.
Try appending ";interface=wifi" onto the URL when using a device (instead of ";deviceside=true"). This will force a Wi-Fi connection (assuming the device has Wi-Fi).
Related
I have an app controlling my AVR on a local network and I'm trying to embed some of the functionality into another app written by myself. I've started up WireShark and started controlling the volume, which shows up as:
GET /ctrl-int/1/setproperty?dmcp.device-volume=-15.750000 HTTP/1.1
I'm not totally up on this type of http control but i'd like to know if this is enough data to be able to send the same request via a browser or terminal etc.
cheers
Without knowing the avr you can't realy tell. But you should be able to send the command via
avr-ip/ctrl-int/1/setproperty?dmcp.device-volume=-15.750000
in the browser or from you app. The ip should be in the wireshark logs as well.
If that works it was enough information.
I would want to send a message from the server actively, such as using UDP/TCPIP to a client using an arduino. It is known that this is possible if the user has port forward the specific port to the device on local network. However I wouldn't want to have the user to port forward manually, perhaps using another protocol, will this be possible?
1 Arduino Side
I think the closest you can get to this is opening a connection to the server from the arduino, then use available to wait for the server to stream some data to the arduino. Your code will be polling the open connection, but you are avoiding all the back and forth communications to open and close the connection, passing headers back and forth etc.
2 Server Side
This means the bulk of the work will be on the server side, where you will need to manage open connections so you can instantly write to them when a user triggers some event which requires a message to be pushed to the arduino. How to do this varies a bit depending on what type of server application you are running.
2.1 Node.js "walk-through" of main issues
In Node.js for example, you can res.write() on a connection, without closing it - this should give a similar effect as having an open serial connection to the arduino. That leaves you with the issue of managing the connection - should the server periodically check a database for messages for the arduino? That simply removes one link from the arduino -> server -> database polling link, so we should be able to do better.
We can attach a function triggered by the event of a message being added to the database. Node-orm2 is a database Object Relational Model driver for node.js, and it offers hooks such as afterSave and afterCreate which you can utilize for this type of thing. Depending on your application, you may be better off not using a database at all and simply using javascript objects.
The only remaining issue then, is: once the hook is activated, how do we get the correct connection into scope so we can write to it? Well you can save all the relevant data you have on the request to some global data structure, maybe a dictionary with an arduino ID as index, and in the triggered function you fetch all the data, i.e. the request context and you write to it!
See this blog post for a great example, including node.js code which manages open connections, closing them properly and clearing from memory on timeout etc.
3 Conclusion
I haven't tested this myself - but I plan to since I already have an existing application using arduino and node.js which is currently implemented using normal polling. Hopefully I will get around to it soon and return here with results.
Typically in long-polling (from what I've read) the connection is closed once data is sent back to the client (arduino), although I don't see why this would be necessary. I plan to try keeping the same connection open for multiple messages, only closing after a fixed time interval to re-establish the connection - and I hope to set this interval fairly high, 5-15 minutes maybe.
We use Pubnub to send notifications to a client web browser so a user can know immediately when they have received a "message" and stuff like that. It works great.
This seems to have the same constraints that you are looking at: No static IP, no port forwarding. User can theoretically just plug the thing in...
It looks like Pubnub has an Arduino library:
https://github.com/pubnub/arduino
I want to send a message to everyone(broadcast) in my subnet(LAN) so as to prevent them using Internet due to repair work that's going to happen. How do i do that ? I can't use "wall" because no one is logged on some server.
I want to send a packet that opens a new Tab in web browser and displays message that stop using Internet during a certain duration.
http://en.wikipedia.org/wiki/ARP_spoofing
You might be interested in something like this. I am not sure if this will work in your LAN environment, but typically it should mess up with the entire LAN :D
you can use sockets to send a message to everyone connected in LAN, you can use java and when you want send a message to all clients, every client will see a msgbox with the information you want display....
net send command will be helpful in windows machines. Im not sure about linux.
Plz refer the following link for more Info.
http://www.cezeo.com/tips-and-tricks/net-send-command/
This is a solution shared by my senior( Hope it helps anyone who views this post). What we can do is to do DNS spoofing and redirect everyone's request to a server where you can show the required message.
I'm trying to write a small program that I can talk to Omegle strangers via command line for school. However I'm having some issues, I'm sure I could solve the problem if I could view the headers sent however if you talk to a stranger on Omegle while Live HTTP Headers (or a similar plug-in or program) is running the headers don't show. Why is this? Are they not sending HTTP headers and using a different protocol instead?
I'm really lost with this, any ideas?
I had success in writing a command line Omegle chat client. However it is hardcoded in C for POSIX and curses.
I'm not sure what exactly your problem is, maybe it's just something with your method of reverse engineering Omegle's protocol. If you want to make a chat client, use a network packet analyzer such as Wireshark (or if you're on a POSIX system I recommend tcpdump), study exactly what data is sent and received during a chat session and have your program emulate what the default web client is doing. Another option is to de-compile/reverse engineer the default web client itself, which would be a more thorough method but more complicated.
So, I have a Blackberry 9000 application doing simple networking using HttpConnection. Everything works fine normally, when I go to urls of the form:
http://url.com
But I've discovered that I need to test this in wifi only situations (that is, without a BES or equivalent in sight). After some digging, I discovered that I need to add:
;interface=wifi
To all of my URLS, of the form:
http://url.com;interface=wifi
However, I'm noticing that this does not actually work, it gives me back a HTTP error 406. Which according to wiki is a:
406 Not Acceptable
The requested resource is only capable of generating content not acceptable according to the Accept headers sent in the request.[2]
Am I doing something completely wrong? Does Blackberry wrap wifi only requests in headers that require particularly formatted websites?
As explained on this page, you also need add "deviceside=true" to the URL.
To specify that the underlying TCP
connection should be opened directly
from the handheld, set this parameter
to "true". Specify "deviceside=false"
when receiving or sending data through
the BlackBerry MDS Connection Service.
So your full URL would be:
http://url.com;interface=wifi;deviceside=true