[enhancement] [jsk_topic_tools] warning when using rosrun and there is no subscriber for seconds

[wkentaro]

why not add this feature to jsk_topic_tools/ConnectedBasedNodelet?
This feature is similar as warning when we run image_view without remapping image topic.

notice

• And this is only for rosrun.
• warning should be only once.
• warning will appear after around 2~5 seconds.

maybe using timer with callback function and flag to avoid many warnings.

[garaemon]

This kind of information is available on /diagnostics.
ConnectoinBasedNodelet publishes information about publishers and their subscribers to diagnostics.

[wkentaro]

Oh, sorry. I mean this is not for professionals but for beginners. (I think
the warning of image_view is also for beginners.)

2015年9月19日土曜日、Ryohei Uedanotifications@github.comさんは書きました:

This kind of information is available on /diagnostics.
ConnectoinBasedNodelet publishes information about publishers and their
subscribers to diagnostics.

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#1132 (comment)
.

和田 健太郎 / Kentaro Wada
http://wkentaro.com

[garaemon]

I agree that those kinds of warning helps us a lot, OTH I can easily imagine users say
"I have these warning message, this is a problem" and I will answer "It is an expected warning because no program require output yet ".

[wkentaro]

This idea came from my experience, and I think this is useful for people
who are willing to resolve problems by theirselves. This can save their
time.

I think I understood your concern, that's true the warning does not work
for people who do not read the warning message well.

2015年9月21日月曜日、Ryohei Uedanotifications@github.comさんは書きました:

I agree that those kinds of warning helps us a lot, OTH I can easily
imagine users say
"I have these warning message, this is a problem" and I will answer "It is
an expected warning because no program require output yet ".

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#1132 (comment)
.

和田 健太郎 / Kentaro Wada
http://wkentaro.com

[garaemon]

OK, let's see how it is useful. Please implement that feature.

[wkentaro]

I'm planning to use roscpp::Timer with oneshot argument.
Do you agree with this way?

[garaemon]

WallTimer sounds better