(BK7231N/CB2S - BL0937) WOOX R6128 Smart Plug with Energy Monitoring

About The Device
Woox - Smart Plug
Model: R6128
Item no.: 2961341
4 box ean: 8435606729147



















Disassembled
CB2S BL0937

















Housing is the same as:
https://www.elektroda.com/rtvforum/topic3959065.html
and
https://www.elektroda.com/rtvforum/topic3926632.html

Flash / backup virgin state:
https://github.com/libretuya/ltchiptool
https://github.com/openshwprojects/BK7231GUIFlashTool



















Pogo-pin jig and 0 Ohm resistor for the reset











Configuration:
"chip": "BK7231N",

"pins": {
"6": "LED;0",
"7": "Btn;0",
"8": "Rel;0",
"11": "BL0937SEL;0",
"24": "BL0937CF1;0",
"26": "BL0937CF;0"

Harmless successfully flashed with:
https://github.com/tuya-cloudcutter/tuya-cloudcutter

2) Flash 3rd Party Firmware
> OpenBK7231N_UG_1.15.487.bin
> By firmware version and name
> 1.1.8 - BK7231N / oem_bk7231n_plug
> Tuya Generic
> BSD48 16A UK Smart Plug

Enter AP-mode:
1. Keep button pressed until light goes out; fast blinking
2. Keep button pressed until light goes out; slow blinking

Thanks! Remember to start the NTP driver if you want to use more advanced power metering features. There is also SetupEnergyStats command.
https://github.com/openshwprojects/OpenBK7231T_App/blob/main/docs/commands-extended.md

I've bought the same smart plug more recently, here are some updated information.

Ordered as "WOOX R6128 Smart Plug 16A FR Type E with Energy Monitor" in Czechia from Alza.cz.

Quote:

Smart Plug
Model R6128
Item no.: 2961601
230V~ 16A 50Hz Max. 3680W
IEEE 802.11 b/g/n 2.4GHz

The case can be opened by prying out near the corners (not the flat sides), as noted in the other Nedis plug thread that uses the same housing.
Some damage to the plastic edge must be expected, but fortunately from the back/wall side.

Quote:

PCB
WGF-15 V2.0
2022.11.15

Module
Model: CB2S
P/N: 2.01.01.105610
S/N: 1000940850....

I've used a lab power supply to give the module the 3.3 V power and a some generic old trusty USB/Serial cable for communication.
I decided to connect everything with just test hook clips, so no soldering was needed.
GND was easy to hold on to some long component leg from the other side, for example (I traced some fat PCB line, verified with connectivity test).
Well, one clip had to be held by hand a bit, but flashing with the BK7231GUIFlashTool was so easy and quick that it was not a problem.


Flashed with OpenBK7231N_QIO_1.17.602.bin without any issues.

The device could not connect to my 2.4 GHz Wi-Fi network at first, even if it could see it.
Turned out to be inability to do WPA3 for some reason. Enabling WPA2 on the AP helped.

Configuration: (Assignments differ from the Item no.: 2961341 in the original post in this thread!)

The pins were originally detected/suggested from the Tuya firmware differently, "8: WifiLED_n" and "10: LED", but I flipped both.
The first one because the blue/Wi-Fi LED was left on all the time even after startup, contrary to what I'd expect and how it operated before.
And the second one because the red/activity LED was turned off when the relay was on and vice versa, again the opposite what was happening before.
(But this one depends on everybody's preference and plug usage, it could be changed even in the original firmware after all.)

Also remember to check out "Channel 1" setting under "Configure Startup".
The default is 0 (Off) after startup or power outage, but I prefer -1 to remember the last power state instead.

I set the plug up with NTP and SetupEnergyStats at first, but I ended up not needing them in the end.
As the device's state is periodically polled over the HTTP API `/cm?cmnd=SENSOR` from another box on the LAN instead.
And then graphed with the venerable rrdtool.

Used to monitor the washer/dryer operation 🙂


Thanks to everyone who made this possible, I've sent at least something through the project's PayPal link.