@Cornishman I am afraid you did not read carefully the forum topic I provided. The problem is between Main Deco and Vimin 16 port PoE siwtch. The wired link between them is broken. All symptoms point...

@14paavang Look like it may have that feature, but I can't guarantee. You may need to get X10s, create Deco mesh with them and then check in Deco app if connection preference feature is there.

@Cornishman Check this forum topic to see if it applies to your friend's situation: https://community.tp-link.com/en/home/forum/topic/655034

@Jasper_Kimmel I am thinking you are buying additional Deco unit to add to your Deco mesh. This is how you add new Deco unit to Deco mesh: https://www.tp-link.com/en/support/faq/1590/ The rest should...

@Barney79 It could be, because: 1. Your son's mobile is not connected to Deco mesh, but uses cellular data or connects to someone's else WiFi network; or 2. Your son configured static IP address on...

@ClausBille Judging by IP addresses, your printer and PC are on different IP networks. To put them both on the same network, which will fix the problem, you will need to configure Deco mesh to run in...