rtt is 0.0 in OnRecv callback?

[bronze1man]

I did see that rtt is 0.0 in OnRecv callback.
Please look at this line, it is possiblie that the rtt is 0,and it call OnRecv.
https://github.com/tatsushid/go-fastping/blob/master/fastping.go#L653

I think this is bug, as my ping logger will get a 0 rtt for some real network routes.
It will lower the average rtt to an impossible value. (lower than the light rtt).

[traveller42]

Looks to me as if rtt is only supported for icmp.

[kanocz]

probably fixed with #26

[harshitha-bt]

But the change does not seem to have merged