How to properly connect Trace Sources using Config::Connect??

[Moyukh Laha]

Hello friends,
                   I have doubts on how to connect trace sources using Config::Connect. From 'All Trace Sources' in documentation I can find the trace sources available. Then by looking into it I can also find Config Paths. But what is written in the documentation is not working all the time. For example-- ns3::WifiPhyStateHelper has one Trace source State.
                   And in the Documentation the config path is given as:   "/NodeList/[i]/DeviceList/[i]/$ns3::WifiNetDevice/Phy/State"...............however in one example I find --"/NodeList/0/DeviceList/*/Phy/State/State" with that "$ns3::WifiNetDevice" part missing. [ example/wireless/wifi-sleep.cc example] 
Surprisingly, both the config paths are working.
Why is that? How do I know which GetObject part is to be taken or not? Is there any redundancy?  Is there any method to understand that?? Please help.

Thanks!

[Konstantinos]

Hi,

As the API suggests, there are TWO possible config paths for this class. 

• "/NodeList/[i]/DeviceList/[i]/$ns3::WifiNetDevice/Phy/State"

• "/NodeList/[i]/DeviceList/[i]/$ns3::WaveNetDevice/PhyEntities/[i]/State"

As you can see, the first assumes a single Phy element, while the second has PhyEntities and WaveNetDevice. This is for the case of WAVE (802.11p), where you may have multiple channels.

In other cases/classes there may be only one or multiple.

Now, to use the path, you will need to replace "[i]" with a number or the wildcard "*" (star)

Now, regarding the particular example you mention, I can't comment, but I would recommend to follow the config path as reported in the API.

Regards

K

More details here https://www.nsnam.org/docs/manual/html/tracing.html#using-the-config-subsystem-to-connect-to-trace-sources

[Moyukh Laha]

Thanks K!

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