Why not something like “SONOFF ZBBRIDGE PRO”? It has the same cc2562 chip, doesn’t it?
I assume you use an extension USB cable. And the Pi is not placed near to a Wi-Fi Roter.
Maybe some interferences with the Wi-FI 2.4GHZ?
Did you check you Zigbee and WI-FI channels?
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You asked for what works. Barring either just using the hardware list for ZHA or Z2M you want a recommendation… The tubez device is recommend by a lot of folks around here I trust for Zigbee recommendations. Considering that most of the time Zigbee comms end up being a function of good gear, use good gear. Good isn’t necessarily cheap.
(btw Sonoff is plenty good but there are other concerns such as which version device and what firmware that tubez generally doesn’t. Also I think the one you referred to is a router not a coordinator.)
The coordinator can impact range to first hop and total number of direct connect devices. That’s it if you’re not fighting those issues then it’s not likely the coordinator.
In a well planned zigbee network the coordinator usually is not the issue unless it’s a known bad device. It’s usually better planning or better behavior on the routing devices that make the difference so I really doubt this will solve the issue for you. But if you were going to pick a new coordinator because you think that is it. I’d go Tubez when it’s available.
tl;dr Honestly Id go back and continue the troubleshooting on what you have.
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This seems to be the default response to Zigbee problems. Agree with @NathanCu - assuming you have enough routers and have addressed interference issues, in my experience it’s nearly always cheap buggy devices.
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Well, I have a SkyConnect, usb2, default extension cable, WiFi channel and zigbee checked.
I add three power sockets and tomorrow they won’t show up anymore and won’t connect. It works with a fresh pi 3 install. On my pi4, it doesn’t.
I have literally tried everything out there, different power sockets, different order of adding devices… Really nothing is working here…
Do I understand it correctly that the coordinator will have something like a Web app where I pair all my devices?
If you’re curious of what I’ve tried so far, the history is here
Are you using the thread / zigbee multiprotocol firmware?
What are your devices? (i find the devices have more to do than the coordinator)
And i just read the entire other thread.
I still think it’s your end devices. I saw a note where you said ‘Aquara is good’ yes it is. A lot of that gear is good. But they don’t necessarily always play nice together.
Ive seen some people with Aquara PIRs and the only way they were able to keep them online were using exclusively IKEA sockets… (which are very good routers btw)
I solved my Zigbee range problem by installing these THIRDREALITY ZigBee Smart Plugs in every room. No device (router) is more than 12ft (3m) from another.
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A strong ZigBee Mesh Is a basic requirement for reliable ZigBee.
98 devices, 45 of which are routers. No problems with ZigBee at all.
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Yes, I too have found the 3rd Reality plugs a good low cost reliable router, and you get a power monitored controlled plug to boot.
Do you know what Zigbee chip they use?
I’ve also found their door sensor and PIR end devices some of the most reliable and long lasting in their categories. And the Zigbee2MQTT OTA seems reliable and relative fast for end devices. As well for the plugs.
I bought lots of these, which I think are the same as the third…thingy
ZigBee Smart Steckdose 16A, 3680W Alexa Steckdose mit Fernbedienung/Sprachsteuerung, Intelligente Steckdose misst den Stromverbrauch, Steckdose Kompatibel mit Alexa&Google Home. Hub Required. 2 Pack Amazon.de
I have three (!!!) in like 1m away from the coordinator, 3m away from 1st one, and 3m away from second one. And they break connection after three days or less, reliably. Don’t tell me that’s too much. I bought an aqara plug, too. 2m away from coordinator, won’t work on second day.
I’m not stupid… I’m trying to find the error and all I hear is “get more plugs” 
So, is there a way how I can externalise all zigbee stuff to a different device than my Pi to check if the Pi is somehow broken?
How do I know what firmware the SkyConnect is using? And is there a better and a worse one?
Another possibility is
We know that’s not what they’re saying. But it’s not just get more it’s get more known good ones. For instance there’s tons of generic cheap Tuya clone no name plugs that are routers that also play fast and loose with the spec and drop messages. (leaving end devices to drop off eventually)
Did you try to setup Matter?
The form factor of the device you reference, if it is from the same manufacture, is really different than the one I have here in USA, I wonder if that could be a factor.
3rd Reality product I am referring to (link below). Company web site link below that.
I hear your frustration! Hard to understand where your problem is at. You might try a Hue or Ikea plug (if you can be sure that you can return them if no better) and see if they yield different results.
That said, it sure seems like you have some issue that is not surfacing itself.
Good hunting!
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As what plug-types are they exactly being detected by Z2M?
There are two versions i have personal experiences with:
- The older version is showing up as TS011F_plug_1.
- The newer version is showing up as TS011F_plug_3.
I have a couple of those smart plugs (both versions, bought at AE and white-labeled as "Girier”).
While the TS011F_plug_1 is working kind of OK the TS011F_plug_3 is simply trash loosing connection often and their routing is simply weird.
In my opinion and based on my own experience those _plug_3’s are unusable within a Zigbee network but can be used as paperweights at best!
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I haven’t set up matter yet, no, but really looking forward to it! It’s still kinda out of reach, so haven’t put much effort into research.
Feel free to post your devices! I need plugs, motion sensors, Temperature, vibration. No bulbs.
Would be nice to hear what types of other devices you have!
Bro, that is disgusting to hear! What the f?
I am using ZHA, and it’s not showing the exact version. I’ll add two screenshots (basically the same for the two plugs I’m currently using, and which works for two days already)
I guess I’ll get some ikea plugs? Or any other suggestions for cheap and small plugs? I mean, the tradfri is reeeeally ugly and huge. The Hue is at 32€ 
That’s the US version. I googled for third reality EU smart plug and found these
THIRDREALITY Zigbee Smart Steckdose 4 Stücke,16 A Smart Outlet,Zigbee Repeater,CE-zertifiziert, ZigBee Hub erforderlich,funktioniert mit Home Assistant,Homey,kompatiblen Echo-Geräten und SmartThings https://amzn.eu/d/3BAqYiO
They look like the ones that I already have