Teckin SP23 T112_v1.1 W302 (RTL8710BN) Not Connecting to BT Smart Hub 2 WiFi

Question

Hi, I have a UK version of a Teckin SP23 Smart Plug, T112_v1.1 W302 (RTL8710BN), that will not connect to a BT Smart Hub 2 Wifi, but will connect to an Android Hot Spot. For anyone else trying to program this device: I opened the device up, soldered wires to TX, RX, GND, and the +V of C7 (before...

divadiow · Answer

obvious I know, but rebooted the Smart Hub?

insmod · Answer

Is your AP visible from device itself? Use Scan Local Networks in wifi configuration.

nigel945webb · Answer

>>21826110 Good idea, I hadn't rebooted it recently, but just did and it made no difference. It still does not connect.

Added after 23 [minutes]:

>>21826222 >>21826222
I rebooted the device 5 times so it went into safe mode, and connected to the OpenBeken Access Point with my phone.
From the OpenBeken menu I went to configure Wi-Fi and Scan Local Networks. My network was listed at the top, the strongest around. SSID: (I've removed it), Channel 11, Signal -61 dBm.
Everything else was on different channels 6 and 1, and -72 to -73 dBm signal strength.

Added after 17 [minutes]:

After a bit more investigation I have discovered the following:
When the device is in safe mode and broadcasting an AP, SSID: OpenRTL8710B_2D6613C0, on channel 1, 2.4 GHz, I can connect to it easily from my Android phone, with a really strong signal.
However, my desktop PC, only just sees the AP, reporting a really low signal. It will connect eventually, but I cannot get any useful information through it.

Windows showing a connection the OpenRTL device

Really low signal from the OpenRTL device

The desktop distance is less than 30 cm from the device, the same as the phone.
A quick scan of the airwaves shows there is nothing else around on channel 1 (which is the channel the OpenRTL is on).

In summary
1. My desktop PC cannot connect to the device's AP, but my Android phone will connect to the device's AP.
2. The device cannot connect to my home network (BT Smart Hub 2) despite listing it as the strongest signal around.

This is looking like a Wi-Fi configuration issue within the RTL8710B.
Country codes / protocols etc?
Is it possible to force the Wi-Fi standard or encryption?

divadiow · Answer

maybe not be the solution, assuming it's only OpenRTL that has this issue despite being only 30cm away, but I couldn't help but notice your Dell 1707 driver is almost 10 years old. This looks newer for your adaptor?

piotrszulc1 · Answer

Does your BT Smart Hub 2 have WPA3 option enabled? If so, try disabling it (or create additional AP with just WPA2). I've heard RTL8710B doesn't work well with WPA3.

divadiow · Answer

also, WPA3 seemed to be OK in testing, though that may not have been mixed-mode

nigel945webb · Answer

>>21827463 Yes the driver is 10 years old, as is the PC. Thx for the link to the Dell support - that reports that the latest driver is not compatible with my PC 'This driver is not compatible This driver is not applicable for ####### with Windows 10, 64-bit'. I'll probably stick with the current driver as 'it's not broken - so don't fix it'. It has never given any problems in 10 years of connecting to everything else, like dozens of ESP devices and similar.
We maybe missing the point here, I used the Dell PC as an example of how it also wouldn't connect to the RTL8710B.
Probably better to forget about chasing drivers on an old PC and return to the initial problem of the RTL8710B not connecting to a BT Smart Hub 2.

Added after 8 [minutes]:

>>21827575
The BT Smart Hub has WPA2 as default, with the options of WPA-Auto, and None (there is no WPA3 available)
I have just tried both the WPA-Auto and None, and neither of them worked with the RTL8710B

WPA None
Info:MAIN:WiFi SSID: waiting for SSID switch 3/3 (using SSID1)
Info:MAIN:Registered for wifi changes
Info:MAIN:Connecting to SSID [wirelessweb]
Info:MAIN:Main_OnWiFiStatusChange - WIFI_STA_DISCONNECTED - 2
Info:MAIN:Main_OnWiFiStatusChange - WIFI_STA_CONNECTING - 1
Info:MAIN:Main_OnWiFiStatusChange - WIFI_STA_DISCONNECTED - 2
Error:GEN:Can't connect to AP
Info:MAIN:Main_OnWiFiStatusChange - WIFI_STA_DISCONNECTED - 2

WPA Auto
auto reconnect ...
Info:MAIN:WiFi SSID: waiting for SSID switch 2/3 (using SSID1)
Info:MAIN:Registered for wifi changes
Info:MAIN:Connecting to SSID [wirelessweb]
Info:MAIN:Main_OnWiFiStatusChange - WIFI_STA_DISCONNECTED - 2
Info:MAIN:Main_OnWiFiStatusChange - WIFI_STA_CONNECTING - 1
Info:MAIN:Main_OnWiFiStatusChange - WIFI_STA_DISCONNECTED - 2
Error:GEN:Can't connect to AP
Info:MAIN:Main_OnWiFiStatusChange - WIFI_STA_DISCONNECTED - 2

On my phone's Hot Spot I have the option of: Open, WPA2-Personal (default), WPA2/WPA3-Personal, WPA3-Personal
We already know the phone's WPA2-Personal works but I have now also tried Open and WPA3-Personal, and they all work.

insmod · Answer

Can you share a photo of your module, perhaps antenna is somehow damaged? (though i doubt it).
RTL firmware itself is stable, my RTL8710B plug uptime is 3 month without reboots.
Wi-Fi code is shared between RTL8710B, RTL87X0C and RTL8720D and is considered stable.

Still, i believe it's a router problem. BT Smart Hub 2 hardware is based on broadcom, and they don't have a good reputation in open source community.

nigel945webb · Answer

>>21828308
Hi, I may be getting somewhere :-)

Your comment about the release for these RTL chips being stable, and the question about damage has been very helpful.
This device, before reprogramming, was running the stock firmware from Tuya, and successfully connected to the BT Smart Hub 2 for years. I had saved a copy of the Tuya firmware, so today I restored it, booted it up, and tried to connect to my home Wi-Fi (the Smart Hub) - and it wouldn't. This is a result! The fact that OpenBeken won't connect to my home Wi-Fi is duplicated with the Tuya firmware.
Something has happened to the device during the disassembly that prevents it connecting to anything but an Android phone.
Pictures attached of the device. I can't see any damage and I've looked really closely at the decoupling caps too.

I think it's time to move on and put this one in the bin :-)

Thank you (all) for your help
Nigel

divadiow · Answer

boot log from your backup Code: TextLog in, to see the code are these your pins? Code: JSONLog in, to see the code

nigel945webb · Answer

>>21831358
I've just had a poke about following traces/tracks, and I can confirm the following:
12 Relay, high = activated.
14 Button, low = pressed.
15 LED (only one LED), low = on.

Pin 23 is not connected.
No current-detection facility on this device.

divadiow · Answer

ok, what does your template look like as seen in the web app config tab?

nigel945webb · Answer

>>21832013I am unable to extract the Tuya config by using the Webapp download (72 kB) and extracting in the BK7231 Easy UART Flasher. It reports: Failed — see log for more details — Failed to extract Tuya keys — magic constant header not found in binary

So I have created my own config that appears to be doing the correct thing.

insmod · Answer

If you've used LittleFS/Filesystem, then Tuya Config is overwritten. Still, upload what you have here, perhaps something can be extracted.

Anyway, try to update to last firmware. I disabled SDK auto-reconnect, since i've noticed that it significantly increases connection time.
Perhaps it might fix your issue.

divadiow · Answer

no assignments from KV Code: JSONLog in, to see the code Tuya_Teckin_SP23_UK_Plug_(SP23-SP27-FTY_schemaID-0000002x12)_keyaqceqmgp343e7_twezq8g8ykoaggey_T112_v1.1_1.0.3

nigel945webb · Answer

Tuya config file attached - the one I couldn't read.

Tried the new version 256.
Initializing Wi-Fi... OpenRTL8710B, version 1.18.256
Unfortunately, it still will not connect to the Smart Hub 2

I have a second Teckin SP23 that I'm just cutting a hole in to access the pins, without opening the whole case.
Now I know a bit more about the process; I can try to see if this one works with the latest OBK firmware, and hopefully be able to revert it back to the original firmware.

nigel945webb · Answer

On the 2nd Teckin SP23, I have downloaded the Tuya firmware with both ltchiptool-v4.12.2 and BK7231GUIFlashTool-build-233.
The files are very slightly different near the end?
I then re-flashed with OBK OpenRTL8710B_1.18.256.bin.
After a reboot and config, this one connects to my BT Smart Hub 2. All looks good :-)

That confirms that the previous/original Teckin SP23 had a hardware problem after disassembly, and it is not an OBK firmware problem.
Thank you everyone for your help.

insmod · Answer

>>21833137 Your device probably rebooted after you took first backup, and tuya firmware wrote something like reset count to it's data storage.

Teckin SP23 T112_v1.1 W302 (RTL8710BN) Not Connecting to BT Smart Hub 2 WiFi

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