Checking wireless speed between router and client device

I am trying to test my connection speed to the OpenWrt router without relying on websites like speedtest, etc, as I want to benchmark and fine-tune solely the wireless connection between my laptop and the router, so I don't want any external factors to come into play. I tried setting an iperf3 server but when I try to run

iperf3 -c

on the laptop (ubuntu), I get

iperf3: error - unable to send control message: Bad file descriptor

Is there anything I am missing here?

You must run iperf3 -s -D on target device.
-Z will save one memcpy on router saving usual bottleneck on SoC-s

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