networking - Seamless Handover in Windows CE 5.0 and higher using WLAN and VPN over GPRS -

-

i have little tricky problem using network under windows ce .net compact framework.

i try describe...

first of there 3 types of connections established while starting application.

first 1 wlan connection company network

second 1 gprs connection

third 1 openvpn connection should use gprs underlying.

default way user in wlan area , connects company network. times user has leave wlan area needs network connection, connection should seamless switch grps on openvpn. if user enters wlan area again, connection should seamless switch wlan.

so have tried observe connections notified if wifi goes down , switch gprs.

now problem can't find way decide wich network adapter used if open socket tcp-connection in application.

is there way?

update:

now i've tried this:

 foreach (networkinterface inf in networkinterface.getallnetworkinterfaces())             {                 if (inf.name == "cellular line")                 {                     try                     {                         ipaddress addr = inf.currentipaddress;                         socket sock = new socket(addressfamily.internetwork, sockettype.stream, protocoltype.tcp);                         ipendpoint ep = new ipendpoint(addr, 10);                         sock.bind(ep);                         ipendpoint remotetcpserver = new ipendpoint(3025045080, 8000);                         sock.connect(remotetcpserver);                         break;                     }                     catch (exception ex)                     {                         messagebox.show(ex.message);                     }                 }             }

if there 1 adapter powered on work. if enable wlan , gprs connection fails...

what's wrong this?

if you're using windows mobile there simpler way go using optimal connection: use connection manager. connect via wi-fi first priority if available. connection manager should choose in order: wi-fi -> vpn -> gprs based on availability of connections. can specify adapter use if want full control on connection choice. connection manager notify when connection status changes.

if you're using windows ce connection manager isn't available , things more difficult. can bind socket specific adapter want use. can use ip helper api enumerate adapters.


Comments

Post a Comment

Popular posts from this blog

Java 3D LWJGL collision -

-
i making 3d java game lwjgl library, , wondering how add collision detection, player not go through models. i using obj models. here objloader class, loads models: package renderengine; import java.io.bufferedreader; import java.io.file; import java.io.filenotfoundexception; import java.io.filereader; import java.util.arraylist; import java.util.list; import models.rawmodel; import org.lwjgl.util.vector.vector2f; import org.lwjgl.util.vector.vector3f; public class objloader { public static rawmodel loadobjmodel(string filename, loader loader){ filereader fr = null; try { fr = new filereader(new file("res/"+filename+".obj")); } catch (filenotfoundexception e) { system.err.println("couldn't load file!"); e.printstacktrace(); } bufferedreader reader = new bufferedreader(fr); string line; list<vector3f> vertices = new arraylist<vector3f...
Read more

spring - SubProtocolWebSocketHandler - No handlers -

-
i have ugly error during deploying spring app on jboss. 18:11:16,025 error [org.apache.catalina.core.containerbase.[jboss.web].[default-host].[/consumer]] (msc service thread 1-7) exception sending context initialized event listener instance of class org.springframework.web.context.contextloaderlistener: org.springframework.context.applicationcontextexception: failed start bean 'subprotocolwebsockethandler'; nested exception java.lang.illegalargumentexception: no handlers @ org.springframework.context.support.defaultlifecycleprocessor.dostart(defaultlifecycleprocessor.java:176) [spring-context-4.1.3.release.jar:4.1.3.release] @ org.springframework.context.support.defaultlifecycleprocessor.access$200(defaultlifecycleprocessor.java:51) [spring-context-4.1.3.release.jar:4.1.3.release] @ org.springframework.context.support.defaultlifecycleprocessor$lifecyclegroup.start(defaultlifecycleprocessor.java:346) [spring-context-4.1.3.release.jar:4.1.3.release] @ org.s...
Read more

methods - python can't use function in submodule -

-
my folder structure this: pythonstuff/ program.py modulea/ __init__.py foo.py bar.py here's code bar.py : def hello(): print("hello, world!") here's code program.py : #!/usr/bin/env python3 modulea import bar bar.hello() i run $ python3 program.py somehow error: file "program.py", line 3, in <module> bar.hello() attributeerror: 'module' object has no attribute 'hello' edit: __init__.py file empty. edit2: after trying realized had bar.py in root directory contained hello() method. bar.py in modulea/ directory empty. add it import os __all__ = [] module in os.listdir(os.path.dirname(__file__)): if module != '__init__.py' , module[-3:] == '.py': __all__.append(module[:-3]) the init .py files required make python treat directories containing packages; done prevent directories common name, such string, unintentionally hiding v...
Read more