What is considered a router device? Currently I only have the “controller” as router device.
As I said, I had one tuya mwave sensor, but I had to plug it off because it was flooding the network and making everything slow.
Will sharing my map help?
Router devices are devices that can route zigbee traffic, typically most mains powered devices are and battery powered ones are not.
Likely you have too few router devices. A couple of bulbs or power switches might help you build a more stable mesh.
I don’t have stability issues. My network is stable, the problem is new devices not joining. How will a router improve that?
It’s not stable / healthy if you cannot add devices. Read this Zigbee network optimization: a how-to guide for avoiding radio frequency interference + adding Zigbee Router devices (repeaters/extenders) to get a stable Zigbee network mesh with best possible range and coverage by fully utilizing Zigbee mesh networking
Just plug these in around the house. I have 12 of them, one or two in each room such that no Zigbee device is more than a couple of meters from a router.
Devices also have a limit of how many they’ll route for, often in the 5-15 range. You’ve probably hit that.
Zigbee is a mesh network, you want plenty of routers.
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Can you recommend an EU version?
Will any brand work without config?
Innr
I just bought a pack of 4 plugs. Will I be able to connect them? Or will I need to forget some devices before?
I have a similar WiFi plug-in like this; but don’t have yet my Zigbee antenna yet and notice that my HS server is not picking up this device even if its some close to the network. Is it related to this issue?
Absolutely not. Please create your own topic and provide more details than the above post
Which coordinator are you using, and on which firmware?
Some older coordinators could only support 15 direct children, especially on older firmware. This happens to be the exact amount I managed to count on your screenshot, so start with that
Does the zigbee2mqtt provide the firmware details?
Confirmed! 
I am not positive because I have always added them to my Zigbee network. But I SUSPECT that all you have to do is plug them in and give the Zigbee Network several minutes to reconfigure itself. If this doesn’t work, go ahead and “forget” one device and add the switch to your Zigbee network, then wait. Progress report would be appreciated.
I got the pack of 4 zigbee devices.
It was surprisingly smooth. I just set the allow to join, as as soon as I plug them in the socket they were discovered and added. I have paired 3 so far.
I pair each one in the same room where I have the receiver, so maybe that has helped.
Then I moved them across the house and tried to re-pair the ceiling sensor that doesn’t want to pair… no sucess.
Not sure if doing the same operation (unplug from the ceiling, and move it to the same room where the receiver is) will help in any way.
Something worth noticing is that when the plugs were “onboarded” I saw a message they were only compliant up until version 21, and that my network has version 22.
There is a firmware update available for them, not sure if that will help in any way, but I’m updating one of them
I have found that joining and upgrading devices works best when the device is close to the dongle. The Zigbee protocol is for short messages, such as turn on/off, return the temperature, etc. When you add the transient delays of passing update data through multiple routers, (and the reply acknowledge) it slows the upgrade process greatly. I have a plug in my upstairs office and my dongle is in the basement. There are three or four routers between them. A device update through this route can take upwards of an hour. If I move the device to the basement just a couple of feet from the dongle, the upgrade takes a few minutes.
So, my experience is to move the Zigbee device neat the dongle to re-pair it.
Note that I said three or four routers between them… I don’t know. The Zigbee network is constantly re-routing itself, so moving the dongle to another room may disrupt the network for a period.
Version 21/22 - I would be surprised if the Zigbee versions aren’t backward compatible.
If you haven’t upgraded your coordinator firmware or moved to a newer coordinator, you might still run into issues with too many direct devices joining.
If you want to add devices via your new plugs, the permit join button has a drop-down arrow right next to it. Just click that and pair devices via your plugs.
There’s no guarantee that they will keep using that route, but it’s a good start