@Carl thanks for the quick response

I tried stepping up the Echo from scratch after deregistering it, it just defaults to the Main Deco on the ground floor. It doesn't make sense, every other device I bring up to the office connects to the office Deco, iPads, laptops, desktops, phones. Why would it be that the Echo doesn't? I wonder if its a limitation of Echo?

Would be really useful to be able to choose the Deco devices link to, seems like it would solve many issues. You say not possible at this time, are there plans to introduce the functionality? 

HawkEye100 wrote

My question is, how to I force the device to connect to the Deco nearest to it that's providing a great connection and not to the one 2 floors away that's giving it a poor connection?

@HawkEye100 

It is  possible that Amazon Echo considers WiFi signal quality from Main Deco X20 two floors away an adequate, and doesn't bother to look for nodes with better signal. To address that, you may need to artificially worsen Main Deco WiFi signal quality for Echo specifically, so that this device will prefer a different Deco node.

I can suggest two options:

1. Force Amazon Echo use 5GHz only. WiFi 5GHz from Main Deco won't reach Echo device two floors away. 

I am not very familiar with Echo WiFi configuration, but if it does not allow to specify WiFi band - turn off 2.4GHz for Deco Main Network. 

2. Add WiFi signal interference, in the direction between Echo and Main Deco.

For example, put Echo device on a thick metal tray. Perhaps, few layers of household aluminum foil placed under Echo will be sufficient. Google which materials are worst for WiFi signal penetration (a.k.a. WiFi shielding materials) and experiment with them. The objective is to weaken WiFi signal quality between Echo device and Main Deco enough for device to prefer different Deco node.

@Alexandre. Thanks for the suggestion, it's a good one. I gave it a go following the steps below:

• Turned off 5GHz 
• Made an aluminum tray out of foil and put the Echo in it next to the Deco in my office (2nd floor)
• Rebooted the main Deco
• Echo appeared offline in Deco app although all other device in office were connected to the Deco in office and retained an acceptable connection speed
• Rebooted Echo and selected the Deco network from the remembered network. It said it was connected although was not working/responding
• Checked the Deco app and the Echo appeared as offline
• Re enabled 5GHz, rebooted main Deco and within a minute or two Echo connected to the main Deco on the ground floor with a patchy connection I've always had. All other devices in office connected to office Deco with a great connection

The only conclusion I can draw is Deco X20 mesh isn't compatible with Echo devices. It feels like a simple fix would be to allow users to select the Deco they want a specific device to connect to, this is a feature I have seen in other mesh systems

@Alexandre again, thank you for your advice and suggestion. As a household who use Alexa to manage smart home features I think the only solution is to upgrade mesh WiFi to a more feature rich platform eero I would guess.

@HawkEye100 

It makes sense to try different brand of WiFi mesh, if what I suggested didn't work, perhaps Echo can work with different WiFi mesh better. There is no one WiFi mesh that works for everyone.

There is another option, but only if you do really like Deco mesh and reluctant to replace it. Your other brand mesh might support Echo better, but may have issues in different areas. With that in mind, and only if you really, really want to keep Deco, here is another option for you to consider.

Get standalone WiFi router, if you don't have extra one at house - buy the cheapest one you could find. Connect it to one of Ethernet ports of upper floor Satellite Deco, configure router to run in Access Point mode and with SSID different from Deco mesh. Make Amazon Echo devices connect to that SSID.