How to get socket form onoffapplication helper?

[yitao xing]

I notice that there is  a GetSocket() in OnOffApplicatioin class, but there is not something like this in OnOffApplicationHelper.

I am trying to trace the cwnd in the socket that the helper create and install, so after

ApplicationContainer serverApp = server.Install (staWifiNode);//I have actually run a simulation with this script, so the application should be good.

I use

Ptr<OnOffApplication> app = serverApp.Get(0);

but get error info: error: invalid conversion from ‘ns3::Application*’ to ‘ns3::OnOffApplication*’ [-fpermissive]

But when I successfully get applicatioin ptr like Ptr<Application> app = serverApp.Get(0);

I dont know how to get to the GetSocket() function availiable in OnOffApplication.

HELP ANYONE HELP PLZ:(

[Vishaka Basnayake]

Hello,

Would the following work for you?

Ptr<OnOffApplication> app = serverApp.Get(0);

Ptr<Socket> socketA = app->GetSocket();

Thanks 

Vishaka

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[yitao xing]

Hi,

NO. I got this messege:

error: invalid conversion from ‘ns3::Application*’ to ‘ns3::OnOffApplication*’

在 2020年4月18日星期六 UTC+8上午2:34:05，Vishaka Basnayake写道：

Hello,

Would the following work for you?

Ptr<OnOffApplication> app = serverApp.Get(0);

Ptr<Socket> socketA = app->GetSocket();

Thanks 

Vishaka

On Fri, Apr 17, 2020 at 6:58 PM yitao xing <ytxi...@gmail.com> wrote:

I notice that there is  a GetSocket() in OnOffApplicatioin class, but there is not something like this in OnOffApplicationHelper.

I am trying to trace the cwnd in the socket that the helper create and install, so after

ApplicationContainer serverApp = server.Install (staWifiNode);//I have actually run a simulation with this script, so the application should be good.

I use

Ptr<OnOffApplication> app = serverApp.Get(0);

but get error info: error: invalid conversion from ‘ns3::Application*’ to ‘ns3::OnOffApplication*’ [-fpermissive]

But when I successfully get applicatioin ptr like Ptr<Application> app = serverApp.Get(0);

I dont know how to get to the GetSocket() function availiable in OnOffApplication.

HELP ANYONE HELP PLZ:(

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[yitao xing]

// We want to look at changes in the ns-3 TCP congestion window.  We need

// to crank up a flow and hook the CongestionWindow attribute on the socket

// of the sender.  Normally one would use an on-off application to generate a

// flow, but this has a couple of problems.  First, the socket of the on-off

// application is not created until Application Start time, so we wouldn't be

// able to hook the socket (now) at configuration time.  Second, even if we

// could arrange a call after start time, the socket is not public so we

// couldn't get at it.

Here is it. One should create his own application if he wants to trace the socket.

在 2020年4月18日星期六 UTC+8上午12:57:46，yitao xing写道：

[Gopal Rawat]

Hi ,

You can try something like this :

// Use Downcasting for your purpose
Ptr<OnOffApplication> app = DynamicCast <OnOffApplication> (serverApp.Get(0));

// Then access the socket
Ptr<Socket> socket = app->GetSocket();

Regards,

G.