@David-TP My dual frequency W7200 router has about 25 active connections including smart switches, plugs and wired connections.  It connects only at 2.4GHz even on smart phones and TVs - making the 5GHz speedy connection useless.  Why pay extra for a slow connection?  Separating out the 2.4GHz connections would be very helpful.

  @David-TP   Without reading through the whole thread, one of the key challenges with 2.4GHz IOT devices is that the managing application has to be on the same ethernet segment (wireless band and subnet) as the device.

When you have a 2.4GHz IOT device and a 5GHz tablet or laptop connected to the same SSID, the managing app on the tablet often can't 'see' or interact with the IOT device.

Additionally, I really want to keep my IOT devices away from my main network for security and management support reasons.  

At the moment I use the Guest network locked to 2.4GHz to deliver the functionality I need, but frankly the guest network isn't stable, and often drops off.

This is basic functionality I'd expect at the pricepoint of these devices.  TP-Link need to do better here.....

  @Zolteg my issue was different and I solved it! The mesh system did provide 2.4 and 5, and the Rainbird controller should have been able to find the band it needed, but there was another app preventing connection to the network!

Once I shut off the TMobile Secure Wi-Fi VPN app, all worked as expected, and I could program the controller from the Rainbird App on my cellphone. Then I could turn the T-Mobile app back on and it all works fine. (I just need to remember to turn off the VPN app whenever I want to use the Rainbird app on my phone:)

  @David-TP 

"2. The device tends to connect 2.4GHz even though it has a better speed on 5GHz.

Most dual-band devices that support both 2.4GHz and 5GHz will automatically pick a band based on different factors like signal strength and guidance from the mesh Wi-Fi system. It finally decides to connect to 2.4GHz on its own decision and Deco just provided two available solutions."

Whether or not you are aware of it, that is a fancy way of saying "it's not our problem so you are SOL". While I am not disputing the fact that Deco provides two options and lets the device chose, that in no way solves the issue. I would venture to bet that almost everyone who sees the need for a separated 5 ghz network sees the need because their dual band device(s) keep selecting to use the 2.4 ghz band. The reason this happens is because the devices see that the 2.4 ghz band has a stronger signal strength, but is not "smart" enough to realize that the 5 ghz channel can provide significantly faster speeds even though it has a "weaker" signal. 

Unfortunately, this is even the case with my new Mac Mini with the M2 pro chip. There is a know network problem with it that makes it chose the 2.4 ghz over the 5 ghz. I end up with pings over 144 and greatly reduced speeds. There is no way to disable the 2.4 ghz antena on the mac and the only way to force it to the 5 ghz channel is to switch the network 5 ghz only and then back. 

This is an issue with the Mac mini, but not one that is alone among network devices. I realize that you may be correct in thinking that a combined network is best and will allow each device to chose the best option. That would be correct if everything always worked properly.

The reality is far different however. Devices glitch and have faults that take time to remedy, if ever.

Your failing to provide a simple method to seperate the bands is in fact, bad for many of your customers and your stance in this instance is simply bad customer service.

Please enable separate ssid for 5Ghz and 2.4Ghz

I have over 40 iOt devices under 2.4ghz with a separate ssid then my 5Ghgz. And they are not connecting to Home assistant through the gust network. My 2011 router had this option I don't understand how an update one doesn't. 

  @David-TP Just popped in to advise that the lack of this feature has cost the sale of TP-LInk mesh system. Read some reviews, chose a product & was just about to buy when I thought to check for this feature. Will now continue the search with another manufacturer. Identifying why this might be an issue in your OP & then refusing to address it is lamentable.

PS

Ignoring nine pages of requests for this feature suggests complete contempt for the posters, most of whom seem to have already purchased. Maybe that's the issue, you already have their cash so why bother addressing their concerns?

  @David-TP its insanely bad 

For me this makes all Deco units unusable.

Couldn't even fantom that to link was so lousy . Is the unit for technical imbeciles?

Fix it now. Or no one will buy your stuff. 

Can be hard to add this function. You can do it ! 

Get back when you have fixed it and then perhaps anyone will consider your solution again. 

  @RBZ5416 No worries , have already returned my units and went for Asus instead. 

Good luck everyone with freq separation for SSID for eveyone that uses TP-link.