I'm creating an application that uses an android to send and receive data via bluetooth. but I'm having problems when creating the socket. He gets caught in that line mmSocket btserver.accept = (); And I can not pair with any device.I have another doubt, I can make that communication with an android and a symbian?
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I am writing an Android app that should exchange data to a server over Bluetooth, with the server side on a PC running Ubuntu, using the bluez library, in C (or C++).
My Android app fails (IOException) when I try to connect to my server socket on the PC.
Here is essentially what I in the java code (in Android, full eclipse project here: http://dl.dropbox.com/u/2968234/ThinBTClient.zip)
CODE:...........
This throws IOException after a timeout of 10seconds or so.
On the server side (in Ubuntu 8.10), I basically set up a Bluetooth server socket, along the lines described in the example bluez/sdp-register.c
Down below is my C++ program. To compile it do
g++ -I/usr/include/glib-2.0/ -I/usr/lib/glib-2.0/include -o bt_server bt_server.cpp -lbluetooth
I can do the reverse succesfully, i.e. create a server socket in Android and connect from Linux, however this is not what I want to do!
I think either the problem has to do with my config of Ubuntu.
CODE:................
I'm working on application that uses a socket connection.I've implemented 2 different Threads for the read() and the write() methods so they are not being blocked by the read.Everything is working well on the WiFi connection but when I switch to GSM connection the connection becomes unstable without any exception being thrown. It means that there are freezes.the write and read seems to work but no data is actually being piped.
View 10 Replies View RelatedI wondered if there could be a specific reason why a server socket could refused a client request connection , the server running on one android device the other on the emulator?
View 2 Replies View RelatedI would like to know what is the recommendation for socket connection management in Android?In our App we would like to be connected to a TCP/IP server when our app is in the foreground or paused. So, create a connection to a TCP/ IP server when the App starts basically, On Create of the launcher activity. However, we do not want to create a new connection and close connection every time an activity is created, paused, destroyed or orientation changed. So, we save the connection object in the App class and the activities will reuse the same connection.Question is when do I close it? I would like to close the socket when the App is "paused", "stopped" or "destroyed". The problem is these messages are not sent in the App context. How can I figure out if the App is in foreground or not? Even the "Terminated" event for an App is not guaranteed to be delivered. So, in that case how do I know when to disconnect?
View 2 Replies View RelatedI'm working on application that uses a socket connection. I've implemented 2 different Threads for the read() and the write() methods so they are not being blocked by the read. Everything is working well on the WiFi connection but when I switch to GSM connection the connection becomes unstable without any exception being thrown. It means that there are freezes at the write and read seems to work but no data is actually being piped.
View 2 Replies View RelatedI have been trying to setup a Droid to Droid 3G connection. I can confirm that all works great in wifi mode. The Droid can make connection requests (Http, Telnet, raw sockets) in 3G, but I cannot get the Droid to accept a socket connection in 3G mode. I was told by Verizon that a special license may be needed to accept socket connection requests and they would send me some information. So far none has been received. If anyone knows how to program the Droid to accept socket connection requests over 3G, please respond. Also if anyone knows why this not allowed please respond.
View 10 Replies View RelatedI am working on an app that uses a Socket to connect to a controller over TCP. The protocol library was written in Java and I am implementing it in android via a Service. where the Connection class is a Thread that handles the communications with the controller. It's where the Socket lives.I'm using the Preferences mechanism to store the IP and Port. If I feed the Socket the correct IP and Port, the Connection Service works beautifully. However, I am trying to simulate a user entering the wrong information and having the connection fail. The ultimate goal is to present a dialog and offer the ability to "reconnect" or "update settings". However, when I enter a wrong Port number, the application simply hangs.I was under the impression that Threads executed concurrently so I've tried moving the call to start the Connection Service to a Thread, but it still hangs the application.
View 3 Replies View RelatedI am developing an app which has one service running in the background even if the application is closed. This service basically listens to the server via socket connection. It is an app's requirement to keep one consistent connection open. but this drains battery liek anything. I know socket is costly affair in the sense of battery life. Do anybody know any other way to keep communication channel open? or any optimization in using socket?
View 9 Replies View RelatedFirst off, let me say that feel free to recommend me if long lived TCP persistent connections are the way to go or persistent HTTP connections are better.
I've also pre-read that instead of having a persistent connection, I can have a polling mechanism.
I'm just asking in the curious interest of how can I create a persistent connection from Android to a server?
I assume that when I do a read on the inputstream, it blocks until it gets more data to read.
I also assume that when the connection is closed, the read throws an IOException.
The problem is that sometimes when I change the connection from carrier to WiFi or from WiFi to carrier, the read just gets stuck and never throws the IOException.
The SDK is 1.5 and the phone a HTC Hero.
This behavior is quite ugly for me because I need to stay always connected.
Does someone else have ever seen this problem ? Is it a bug or am I the bug?
I'm making a chat program and server relay on pc and I was wondering if there's a simple template for tcp/ip socket connections.
View 9 Replies View RelatedI am playing around a bit with peer-to-peer communication with android devices.I have written a basic program that creates a listening ServerSocket on each phone using the application. Using the application you can also connect to other devices that is listening, by connecting to the remote ServerSocket. Nothing strange about that.My problem is that it seems that the listening port is not open for connection on different devices. I can connect to my HTC Desire, works like a charm. But connecting to a HTC Hero I get timeout, same if I try to connect to the emulator. But connection FROM the emulator to the Desire and FROM the Hero to the Desire works like a charm. Whats up with this? No security apps is installed and both devices(and the emulator) is running 2.1.
View 1 Replies View RelatedHow can I make the Device sound a beep when socket connection has been established. In other words, how to set a notification tone when an event occurs in Android sdk?
View 1 Replies View RelatedI'd like to know whether there is a way to connect to a TCP server (socket server) in an computer using his name (e.g.: my computer has a host name: MyComputer; then I must connect with it using his name).
It can be done using NBNS protocol (NetBios Name Service), but always I try to connect using his name, the Tablet uses DNS protocol instead of NBNS, as I might expct.
I'm developing a program in which, from an Android Phone, I have to connect as a client to a Bluetooth medical sensor. I'm using the official Bluetooth API and no problem during connection (SPP profile), but when I end the socket, the sensor is still connected to my phone (although I have close the connection).
Are there any way to make a Bluetooth disconnection? I think there is an intent called ACTION_ACL_CONNECTED, which does that. Can anyone explain me how to use this?code...
Does Android keep the connection between the server/socket when it moves from EDGE to WIFI and vice versa?
View 1 Replies View RelatedI'm trying to set up a basic network connection using droids but I'm having problems.my server program:
Code:
ServerSocket ss = new ServerSocket(8888);
while(!end){
//Server is waiting for client here, if needed[code]....
the server runs until it reaches ss.accept() like it should but the client still can't connect. The client usually times out and nothing happens
I'm running both these programs using eclipse on my computer. I set the premissions in the manifest for both programs to let them use the internet and I have the port forwarding .
So Im writing an application to communicate to a Wi-Fi enabled Arduino board with a static IP...
This is what Im trying to do...
1.) Enter Ip and Host
2.) Connect
3.) Simply send either a "0" or "1" to the arduino board
There are two activities at the moment, one to enter the IP and port of the Board (which is set from the board itself) and one to send data to the board. When i comment out the connection methods in the Communicator class the app swithches activities without any issues, but when i un-comment them and attempt to connect, the app immediately closes after i attempt to connect.
Code:
package car.test.namespace;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
[Code]...
Code:
package car.test.namespace;
import java.io.*;
import java.net.*;
public class Communication {
[Code]...
Code:
package car.test.namespace;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
[Code]..
Also, im not even seeing the "Connection Failed" message, the app is just shutting down,.
I am trying to open a Socket on Android but everytime I try I keep getting connection refused error no matter what way I try.The error happens on the following line of code where I try to create the connection.
View 2 Replies View RelatedI am facing problem to establish a socket connection from android device to PC's a specific port like 8080. I just want to create a socket which will connect to the specific port and also write some data stream on that port.I have written some code for this purpose.
View 3 Replies View RelatedWe have a simple client server architecture between our mobile device and our server both written in Java. An extremely simple ServerSocket and Socket implementation. However one problem is that when the client terminates abruptly (without closing the socket properly) the server does not know that it is disconnected. Furthermore, the server can continue to write to this socket without getting any exceptions. Why? According to documentation Java sockets should throw exceptions if you try to write to a socket that is not reachable on the other end!
View 5 Replies View RelatedI have connected my Android application to a Windows desktop machine via Bluetooth. The application interacts with the machine. At the end of the interaction the application on the desktop closes the socket that was opened between the Android and the desktop application. Right when socket.close() is called on the Windows machine my Android app pops open a dialog saying that the application has stopped unexpectedly and then it quits. I have a breakpoint on the line in the ConnectedThread (like in the BluetoothChat sample) where I read the InputStream on the Android and that is not hit. I also have a breakpoint in the catch statement for the try surrounding the place where I read the InputStream. That one also does not get hit. So I have no idea how I can catch this error. Is this a bug?
View 2 Replies View RelatedEssentially Im trying to get many many java clients connect to a socket on my ColdFusion server (Using the Socket Gateway). However before i even start to code this, Im a little confused about sockets and their performance. First of all, are sockets meant for many(1000+) clients connecting to one socket (say port 2202) on one server? How is the performance if all there waiting for is basically a ping, or something such that when these clients receive this "ping" they can go get some new data.
View 5 Replies View RelatedI'm guessing this will be such a newbee question but I hit a wall and I am running the WebSocket.Now, when I start the server and run the Weberknecht client like a normal Java application I get a connection. Granted, the connection is quickly dropped because the handshake needs to be configured but at least the server shows me a connection was attempted.
View 2 Replies View RelatedIs there any way to comunicate an android phone with a computer trough bluetooth? Ive made a server/client applicattion in Java using bluetooth, but i need to do the client in Android and i dont know how to start, I dont know even if is possible. I only need to send a text message.
View 2 Replies View RelatedI have program that runs a bluetooth connection. The socket connects fine. We then read/write from the related streams. This works fine for about a minute, then we start to get IOExceptions from the InputStream.available() and OutputStream.write() functions. The IOException indicates that the socket has been closed. Could anybody take a stab at what might be going on here?
View 2 Replies View RelatedI'm having an issue here while trying to connect to an RS232 device with the BluetoothChat sample program.
1- If I first pair my phone with the device through Bluetooth Settings, no problem. The connection is made perfectly and the program works.
2- If not bonded beforehand, I get two errors in a row when I click on my device :
CODE:.................
I thought it would be quite easy to develop a bluetooth application on Android, but it looks like the support is very bad. While pairing works, my Nexus One with Android 2.1 can't connect to the PC. It's the same in Windows and Ubuntu. I used on my Desktop computer, in Windows, Hyperterminal and waited on an incoming bluetooth com-port. I searched already a bit, Maybe this:
http://code.google.com/p/backport-android-bluetooth/
or this library:
http://code.google.com/p/bluecove/
I'm able to discover devices which r bluetooth ON from my application. But when i try to connect using the Bluetoothsocket's connect() method, I'm getting an IOException: Connection refused.
I'm using the following UUID private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");