[Solved] The UPC connect box router does not connect smart home devices

Hello
I have a WiFi connect box router from UPC.
It has 2.4GHz and 5GHz wifi.
I have several smart home wifi devices (several switches and thermometers) that I cannot connect to the Tuya application.
It looks as if the router is blocking something.
I've already tried turning off the 5GHz band and it didn't help.
Interestingly, a repeater is connected to the router (not wired, but also via WiFi) and connecting these devices to the Tuya application via the repeater is hassle-free.
However, I want these devices to work on the router and not through the repeater.
What can block the possibility of connection?
I'm asking for advice "like a cow in a ditch" because I'm new to these blocks.

Do you have a different SSID on the router and another on the repeater?

The router is UPC0042***
Repeater UPC0042***_EXP
The passwords are the same

And the phone is connected to which network?

emariusz wrote:

And the phone is connected to which network?

During pairing, the phone must be connected to the same network within the range of the smart device.
Location must also be turned on.
I do it like this:
I connect the phone to the repeater's network and turn on the location.
I start the pairing process and after a while I have the device visible in the tuya application, paired by the repeater.
I switch to any network (router or data) and can control the smart device.
Second option:
I connect the phone to the router's network (2.4Ghz) and turn on the location.
I start the pairing process, the app counts down and the pairing fails.
It looks like something is blocking the device's access to the router.
But not to the repeater, although it is also connected to the router.

If the device is closer to the repeater, you are doing everything correctly. It connects to the router through an amplifier because it has a stronger signal.

emariusz wrote:

If the device is closer to the repeater, you are doing everything correctly. It connects to the router through an amplifier because it has a stronger signal.

I don't think we understood each other.
I want to connect my smart device via the router, but I can't do that.
Even if I turn off the repeater from the network and it no longer strengthens the signal, the pairing of the smart device via the router fails. When I turn on the repeater between the router and the device (and it finally works on the same frequency), the connection with the repeater is successful.
I would like to emphasize that I perform all these connection operations close to the router, so there is no loss of signal.

@mad4max
UPC uses Smart WiFi in its modem routers - it must be turned off.
Additionally, the 2.4GHz and 5GHz networks must have a different name and a different encryption key.

Additional question, what software version do you have on the Connect Box?

clarify Near how many meters is the room itself?

emariusz wrote:

clarify Near how many meters is the room itself?

During pairing, I am 1-1.5 m from the router.

Added after 7 [minutes]:

KOCUREK1970 wrote:

@mad4max
UPC uses Smart WiFi in its modem routers - it must be turned off.
Additionally, the 2.4GHz and 5GHz networks must have a different name and a different encryption key.

Additional question, what software version do you have on the Connect Box?

I have deactivated smart wifi optimizations. The 5GHz network is disabled, so its name and key do not matter.
Photos of settings and software versions

KOCUREK1970 wrote:

@mad4max
UPC uses Smart WiFi in its modem routers - it must be turned off.
Additionally, the 2.4GHz and 5GHz networks must have a different name and a different encryption key.

Additional question, what software version do you have on the Connect Box?

I have deactivated smart wifi optimizations. The 5GHz network is disabled, so its name and key do not matter.
Photos of settings and software versions

Sorry for the question, but before trying to pair with the router, did you reset your smart device?

@mad4max
You also have active IPv6 there - turn it off with the consultant on the hotline.

emariusz wrote:

Sorry for the question, but before trying to pair with the router, did you reset your smart device?

It resets the smart switch every time it pairs. I unplug from the app and when pairing again it has to go through a reset process.

Added after 1 [minute]:

KOCUREK1970 wrote:

@mad4max
You also have active IPv6 there - turn it off with the consultant on the hotline.

Can't it be turned off from the router? What is it for? So that I don't turn off something necessary.

mad4max wrote:

Can't it be turned off from the router?

No, because it is assigned by the operator, so only he can deactivate it.

mad4max wrote:

What is it for?

Currently, it's useless - with a hose
And in the future, maybe one day it will be used on a larger scale:
https://pl.wikipedia.org/wiki/IPv6

I will try to add videos of how it is paired using a repeater and router.
First pairing with the repeater


Added after 2 [minutes]:

Here it is pairing with the router, the repeater is connected from the network

As you can see, the first phase of pairing is taking place, the device stops flashing, but the further stage of registration to the cloud is somehow blocked.
As you can see, the device works, it also pairs on other networks (routers)

And try this:
Change the SSID on the amplifier to the same one as the router. (remove ***_EXP)
Pair your device with the repeater.
Turn it off.
Check if it connects to the router.

My amplifier has the same SSID, so when I move my Smart to another place, I don't have to pair it again, it connects itself to the strongest signal.

emariusz wrote:

And try this:
Change the SSID on the amplifier to the same one as the router. (remove ***_EXP)
Pair your device with the repeater.
Turn it off.
Check if it connects to the router.

My amplifier has the same SSID, so when I move my Smart to another place, I don't have to pair it again, it connects itself to the strongest signal.

This procedure did not help, I turned the repeater into an ordinary amplifier and connected it via WPS, which means it is a clone with the same settings as the router.
I moved away from the router to make sure that the smart switch was connecting to the amplifier. I turned on the amplifier and positively connected the device to the app. The problem is that after moving it near the router and turning off the repeater, the smart switch is outside the network. When I turn the repeater back on, the connection to the device returns.
In one word, it sucks.
I don't know what to do next.

After an unsuccessful pairing attempt (these 2 minutes), tuya asks whether to repeat or change the pairing mode.
Select switch and try in this other mode (I think it's called AP pairing mode).

emariusz wrote:

After an unsuccessful pairing attempt (these 2 minutes), tuya asks whether to repeat or change the pairing mode.
Select switch and try in this other mode (I think it's called AP pairing mode).

When changing the mode, the pairing sequence repeats, there is no other mode. You can only try at one point to make the LED on the device blink slowly, but then the device requires pairing with the internal ZigBee network. I have wifi devices.
The question is whether the router can block some MAC addresses or something like that, or maybe it has some limit on connected devices?
Damn, everything worked fine on my previous UPC router, but now it's like this.
Help. I know there are a lot of professionals here.

Three seconds before the end of the second video, two buttons appear:
Retry
Switch Pairing Mode
Choose the latter

emariusz wrote:

Three seconds before the end of the second video, two buttons appear:
Retry
Switch Pairing Mode
Choose the latter

This is what I chose, and I return to the same procedure
Select network and password (device and phone in the same)
Reset by holding 10 sec
Restart by holding 5 sec
Inquiry whether the LED is blinking
And the next point is whether the diode blinks fast or slow, I choose fast as in the video (it blinks slowly when it is Zigbee and not WiFi)
The pairing procedure follows again as in the video and fails.
In other words, there is no other method of pairing. If at some point I clicked, the LED flashes slowly, it takes me to the network settings where it looks for the internal ZigBee network.
This direction is wrong.
It's something in the router, if anywhere else, the device connects without any problems using this procedure.

Added after 52 [minutes]:


Edit:

New information and tests.
I found an old TP-Link TL-WR740N router.
I created a small network by connecting its WAN input with the LAN output of the Connect Box router from UPC with a network cable.
I gave the new router a new name and password, so I have a new Wi-Fi transmitter.
And here's an interesting fact, on this router (as previously on the repeater) I can pair my smart devices without any problems. Pairing is identical to the video.
This makes me think, why is it that only the Connect Box does not allow pairing?

Added after 38 [seconds]:


Edit:

New information and tests.
I found an old TP-Link TL-WR740N router.
I created a small network by connecting its WAN input with the LAN output of the Connect Box router from UPC with a network cable.
I gave the new router a new name and password, so I have a new Wi-Fi transmitter.
And here's an interesting fact, on this router (as previously on the repeater) I can pair my smart devices without any problems. Pairing is identical to the video.
This makes me think, why is it that only the Connect Box does not allow pairing?

mad4max wrote:

If at some point I clicked, the LED was blinking slowly, it would take me to the network settings

And here, from what I remember, you should connect to the Wi-Fi broadcast by the smart device and not to your router.
When switching to the latter mode, the device sends a SmartLife*** or Tuya*** wifi signal or something similar.

Does this device have wifi and zigbee? What model is this?

Here's a nice description: http://www.id3.pl/wp-content/uploads/2019/08/Parowanie-i-podstawy-aplikacji-TUYA-SMART.pdf

emariusz wrote:

mad4max wrote:

If at some point I clicked, the LED was blinking slowly, it would take me to the network settings

And here, from what I remember, you should connect to the Wi-Fi broadcast by the smart device and not to your router.
When switching to the latter mode, the device sends a SmartLife*** or Tuya*** wifi signal or something similar.

Does this device have wifi and zigbee? What model is this?

Here's a nice description: http://www.id3.pl/wp-content/uploads/2019/08/Parowanie-i-podstawy-aplikacji-TUYA-SMART.pdf

I did as you wrote.
Now for some explanations.
In fact, as you wrote and described in the manual, the smart switch creates the so-called hotspot to connect, but the problem is that before you create it, you also need to provide the name of the network you are connected to. Then in the next steps it creates a hotspot.
So we return to the starting point.
When going through the pairing process in AP mode, I enter the name of the UPC router network, move on, the device creates a hotspot and ...... sneezes. There is no connection.
And now an interesting fact, the same procedure for the AP mode, but in the first step I provide the repeater network or in the second attempt the new TP-Link router and ...... everything goes smoothly and without any glitches. The connection is successful, the switch works, the app sees it.
So the problem is still the UPC router.
I have an option that if I cannot solve the problem, although there should be a way, I will leave the TP-LINK router turned on for these smart devices.
However, I would prefer to connect to the UPC router so as not to crowd the WiFi network with a new router.

Added after 1 [minute]:

emariusz wrote:

mad4max wrote:

If at some point I clicked, the LED was blinking slowly, it would take me to the network settings

And here, from what I remember, you should connect to the Wi-Fi broadcast by the smart device and not to your router.
When switching to the latter mode, the device sends a SmartLife*** or Tuya*** wifi signal or something similar.

Does this device have wifi and zigbee? What model is this?

Here's a nice description: http://www.id3.pl/wp-content/uploads/2019/08/Parowanie-i-podstawy-aplikacji-TUYA-SMART.pdf

I did as you wrote.
Now for some explanations.
In fact, as you wrote and described in the manual, the smart switch creates the so-called hotspot to connect, but the problem is that before you create it, you also need to provide the name of the network you are connected to. Then in the next steps it creates a hotspot.
So we return to the starting point.
When going through the pairing process in AP mode, I enter the name of the UPC router network, move on, the device creates a hotspot and ...... sneezes. There is no connection.
And now an interesting fact, the same procedure for the AP mode, but in the first step I provide the repeater network or in the second attempt the new TP-Link router and ...... everything goes smoothly and without any glitches. The connection is successful, the switch works, the app sees it.
So the problem is still the UPC router.
I have an option that if I cannot solve the problem, although there should be a way, I will leave the TP-LINK router turned on for these smart devices.
However, I would prefer to connect to the UPC router so as not to crowd the WiFi network with a new router.

mad4max wrote:

However, I would prefer to connect to the UPC router so as not to crowd the WiFi network with a new router.

Switch the CB to modem/bridge mode and connect TPlink - IPv6 must only be disabled on the CB (because if it is active, there is no bridge mode).

By the way, why didn't you disable ipv6 - this is often a problem (not all servers in the world respond to ipv6).

Hello after a long break.
The problem of pairing smart devices with CB has still not worked.
I solved the problem by remaining on the previously described version with a new TP-Link router added, creating a completely new network exclusively for these devices.
It may not be what I wanted, but at least everything works.
Thanks everyone for the tips.