Anyone seen devices *actually* using TWT/target wake time?

[table45]

Target wake time was one of the headline features of Wi-Fi 6, and there were plenty of stories about how it would improve battery life, including for iPhones.

I've been watching my iPhone and iPad connect to my wifi with Wireshark and they do NOT request (or use) target wake time when they associate with my wifi network:

My router's Beacons advertise target wake time as available via "TWT Responder Support: Supported" (1).
The Association Request coming from my iDevices has both TWT Requester and Responder set to Not Supported (0).
The router's Association Response to the above continue to advertise target wake time as available via "TWT Responder Support: Supported".
There are no TWT Elements negotiated specifying a twt wake interval or wake duration.

My setup is a stock Asus rt-be86u and yes target wake time is enabled in settings, as you can already see above

 

[sfx2000]

WiFi6 TWT is mostly focused on IoT devices...

 

[table45]

A lot of claims made about wi-fi 6 include all battery powered devices and specifically improving battery life for phones and tablets, not just IOT.

But there seems to be a big difference between what is advertised and what vendors actually implement. I thought twt was supposed to be mandatory to claim wi-fi 6 support.

 

[sfx2000]

Please understand - marketing vs engineering...

The AP can state that TWT is present, and then turn it off via parameters - that the beacon has the info item is support enough.

 

[table45]

Yeah I guess that’s what I’m pointing out. The reality doesn’t match the marketing.

In this case it’s not the routers fault or choice though - the router keeps offering twt but the phone doesn’t take it up on the offer.

 

[jzchen]

Try letting your iPhone battery go low, like really low. I thought I read somewhere Apple lost a lawsuit about throttling performance due to low battery energy conservation. Maybe it will use it to save battery with the "battery saver" feature or whatever Apple calls it's version.