Support reverse mode

[Himura2la]

It would be nice to collect data not only for upload speed, but also for download speed (-R iperf3 parameter)

[cooperlees]

Isn't this iperf3_received_bytes ?

[Himura2la]

It's about adding the ability to pass the -R flag to iperf3. I guess it would require adding а relabel_config like __reverse_mode__ with values true/false with default false

[cooperlees]

Yeah, I was just about to reply. I went and read the code, I see it's NOT. I'd like this too. I might look at trying to do a PR. But I'm a go n00b, but should be able to copy pasta enough and guess.

[Himura2la]

Cool, go on, I can test this ))