So here is the config:
Far side
/interface wireless> print advanced
Flags: X - disabled, R - running
0 R name="wlan1" mtu=1500 l2mtu=1600 mac-address=***** arp=enabled disable-running-check=no interface-type=IPQ4019
radio-name="*****" mode=station-bridge ssid="*****" area="" frequency-mode=manual-txpower country=new zealand
antenna-gain=0 frequency=5660 band=5ghz-a/n/ac channel-width=20/40/80mhz-Ceee secondary-channel="" scan-list=default
wireless-protocol=nv2-nstreme-802.11 rate-set=default supported-rates-a/g=6Mbps,9Mbps,12Mbps,18Mbps,24Mbps,36Mbps,48Mbps,54Mbps
basic-rates-a/g=6Mbps max-station-count=2007 distance=dynamic tx-power-mode=default vlan-mode=no-tag vlan-id=1
wds-mode=disabled wds-default-bridge=none wds-default-cost=100 wds-cost-range=50-150 wds-ignore-ssid=no
update-stats-interval=disabled bridge-mode=enabled default-authentication=yes default-forwarding=yes default-ap-tx-limit=0
default-client-tx-limit=0 wmm-support=disabled hide-ssid=no security-profile=default wps-mode=push-button
station-roaming=enabled disconnect-timeout=3s on-fail-retry-time=100ms preamble-mode=both compression=no allow-sharedkey=no
station-bridge-clone-mac=00:00:00:00:00:00 ampdu-priorities=0 guard-interval=any
ht-supported-mcs=mcs-0,mcs-1,mcs-2,mcs-3,mcs-4,mcs-5,mcs-6,mcs-7,mcs-8,mcs-9,mcs-10,mcs-11,mcs-12,mcs-13,mcs-14,mcs-15,mcs-16,
mcs-17,mcs-18,mcs-19,mcs-20,mcs-21,mcs-22,mcs-23
ht-basic-mcs=mcs-0,mcs-1,mcs-2,mcs-3,mcs-4,mcs-5,mcs-6,mcs-7 vht-supported-mcs=mcs0-9,mcs0-9,mcs0-9 vht-basic-mcs=mcs0-7
tx-chains=0,1 rx-chains=0,1 amsdu-limit=8192 amsdu-threshold=8192 tdma-period-size=2 nv2-queue-count=2 nv2-qos=default
nv2-cell-radius=30 nv2-security=disabled nv2-preshared-key="" nv2-mode=dynamic-downlink nv2-downlink-ratio=50
nv2-sync-secret="" hw-retries=7 frame-lifetime=0 adaptive-noise-immunity=none hw-fragmentation-threshold=disabled
hw-protection-mode=none hw-protection-threshold=0 frequency-offset=0 rate-selection=advanced multicast-helper=default
multicast-buffering=enabled keepalive-frames=enabled
Near side
/interface wireless> print advanced
Flags: X - disabled, R - running
0 R name="wlan1" mtu=1500 l2mtu=1600 mac-address=***** arp=enabled disable-running-check=no interface-type=IPQ4019
radio-name="*****" mode=bridge ssid="*****" area="" frequency-mode=manual-txpower country=new zealand antenna-gain=0
frequency=5660 band=5ghz-onlyac channel-width=20/40/80mhz-Ceee secondary-channel="" scan-list=default wireless-protocol=802.11
rate-set=default supported-rates-a/g=6Mbps,9Mbps,12Mbps,18Mbps,24Mbps,36Mbps,48Mbps,54Mbps basic-rates-a/g=6Mbps
max-station-count=2007 distance=dynamic tx-power-mode=default vlan-mode=no-tag vlan-id=1 wds-mode=disabled
wds-default-bridge=none wds-default-cost=100 wds-cost-range=50-150 wds-ignore-ssid=no update-stats-interval=disabled
bridge-mode=enabled default-authentication=yes default-forwarding=yes default-ap-tx-limit=0 default-client-tx-limit=0
wmm-support=disabled hide-ssid=no security-profile=default wps-mode=disabled station-roaming=enabled disconnect-timeout=3s
on-fail-retry-time=100ms preamble-mode=both compression=no allow-sharedkey=no station-bridge-clone-mac=00:00:00:00:00:00
ampdu-priorities=0 guard-interval=any
ht-supported-mcs=mcs-0,mcs-1,mcs-2,mcs-3,mcs-4,mcs-5,mcs-6,mcs-7,mcs-8,mcs-9,mcs-10,mcs-11,mcs-12,mcs-13,mcs-14,mcs-15,mcs-16,
mcs-17,mcs-18,mcs-19,mcs-20,mcs-21,mcs-22,mcs-23
ht-basic-mcs=mcs-0,mcs-1,mcs-2,mcs-3,mcs-4,mcs-5,mcs-6,mcs-7 vht-supported-mcs=mcs0-9,mcs0-9,mcs0-9 vht-basic-mcs=mcs0-7
tx-chains=0,1 rx-chains=0,1 amsdu-limit=8192 amsdu-threshold=8192 tdma-period-size=2 nv2-queue-count=2 nv2-qos=default
nv2-cell-radius=30 nv2-security=disabled nv2-preshared-key="" nv2-mode=dynamic-downlink nv2-downlink-ratio=50
nv2-sync-secret="" hw-retries=7 frame-lifetime=0 adaptive-noise-immunity=none hw-fragmentation-threshold=disabled
hw-protection-mode=none hw-protection-threshold=0 frequency-offset=0 rate-selection=advanced multicast-helper=default
multicast-buffering=enabled keepalive-frames=enabled
5660 was chosen so it does not interfere with other access points.
The testing was done via the built-in bandwidth tester. TCP is about 30% lower than UDP test.
The 802.11 was chosen at the end because
1) Stability - no hiccups.
2) Latency - it dropped from 3-10ms to <1ms.
I don't think NV2 works properly on these devices.
What would be appropriate way to drop the transmit power?
The thing is when I tested these devices indoors (separated by couple of drywalls) and I got ~500Mbit/s TCP test. Perhaps drywall was attenuating power enough, as well as they were sub-optimally aligned?
Edit: I noticed it set to
frequency-mode=manual-txpower