getting the current time

[mn]

hello. i want to get the current time in ns3 and then i can use it for some works. i know that i should use simulator::now() but i used this command in every part of my code and it always show me 0.0

how can i get the current time during simulation

thank you

[Konstantinos]

Hi,

Simulator::Now() gives you the current simulation time. That's it.

The fact that you get 0.0 as result is probably because the time has not advanced, ie. you call it before the simulation has actually started.

Regards,

K

[mn]

i want to set access point in sleep mode. with this command

    Ptr<WifiNetDevice> wifidevice4 = DynamicCast<WifiNetDevice> (apDevices.Get(0));
    Ptr<WifiPhy> wifiphy3 = wifidevice4->GetPhy();
    Simulator::Schedule(Seconds(68), &WifiPhy::ResumeFromSleep, wifiphy3);
    Simulator::Schedule(Seconds(69), &WifiPhy::SetSleepMode, wifiphy3);

how can i write this with simulator::now();

i want to sleep the ap at the current time

[Konstantinos]

You would replace the Seconds() with Simulator::Now(), but you have to be clear what you mean by the current time.

WHEN is that time? Is is after some event? Then you would need to call that after that event.

[mehrdad manoochehri]

i want to sleep the AP after sending probe request by stations and passing some conditions

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[mehrdad manoochehri]

i took current time in my function and used that to schedule AP when it should be gone to sleep mode. but it is 0. what do i have to do?

[Konstantinos]

You explained the condition when you want to send the AP to sleep in the previous post

"i want to sleep the AP after sending probe request by stations and passing some conditions"

Have those conditions been met? 

With the information you gave, 'i took current time in my function and used that to schedule AP when it should be gone to sleep mode. but it is 0", I can't help you further. 

Where is 'your function' ? When is it called? 

Stop thinking with sequential C programming. ns-3 is an event-based object oriented program.

Your 'scenario' file is used to 'drive' the simulation. If you want to have processes during run-time, you need to use (traced) callbacks to catch those events (e.g. reception of probe messages, conditions being met, etc). 

[mehrdad manoochehri]

probe request will be sent from stations after second 10. and according to my algorithm, function will specify that which AP should be gone to sleep mode. i used trace source to get these information. but i do not know how to run the algorithm after that time according my algorithm

[Ranida Hamidouche]

I faced the same problem. Could you tell me how to resolve it ? thank you.