@Kevin_Z 

Thanks Kevin - very clear. 

@MarkBFr 

I did the same, thier marketing is misleading, I believe on purpose.

Anyway, as I have the same setup, you have two options;

Setup 1 (what I'm using now, too tired to test the other one below)

MR600 (Gateway + Wifi + DHCP Server) <-> Deco M9 (Wired + WIFI Access Point) <-> Deco M9 (Wired + WIFI Access Point) second unit still in box!!

Seup 2 (My intended test over the next few days)

MR600 (Gateway ONLY - Wifi off?) <-> Decom M9 Master (Wired + Wifi + DHCP Server) <-> Deco M9 Slave (Wired + WIFI Access Point)

I'm going to start by turning off WIFI in the MR600, then set up the M9's using the shitty app using my old WIFI settings, then try to run it for awhile before turnign back on WIFI in the MR600 to see how interference goes. If I do use this system I will be killing all of the inbuild bloat (Virus / Parental Controls etc = Packet sniffing)

Honestly I am more than likely going to return the whole lot back to Amazon as I discorvered the hardware has recently been upgraded to V2 (I purchased last week) and secondly there was NO MENTION of having to sign up to a tplink account to use MY HARDWARE. Also, as I said, I think the whole MESH / ONEMESH thing is hugely deceptive, that was the third sucker punch for me.

Overall;

1: I'm not impressed with the lack of control with the Deco M9 Plus.

2: By being forced to "sign up" to use ANY hardware unless necessary, I don't believe it's necessary for an Access Point.

3: The app is shite

4: The "web interface" is an insult

5: The support is shite

6: Can I stress how annoyed I am at having ANY email tied to my internet router / access points? It's disgusting.

@CasaP happen to me tooo. end up with this messy mesh and onemesh device that cant work along together

shittee marketing works here. 

"if cant convince customer, confuse them."