Troubleshooting Smart Plug RMC004 w/ ZHU2114 Controller: Pinout & BL0937 Metering Info

Hello all,

Device was brought to me disassembled and looks exactly the same as this one - https://www.elektroda.com/rtvforum/topic3945009.html



Interesting thing it is based on ZHU2114 controller, never seen this one before and google is not helping



Pinout is the same as on BK72xx modules, no response from the flasher but there is some transmit going on when CEN is grounded. I'll have more info once I hook it up to some gear and post it here.

It uses BL0937 for metering



Also I believe it came from AliExpress and I'll post more findings as time permits.

EDIT: schematics added

Hello... I have triple-checked the name ZHU2114 and it looks like just a Zigbee device, not a WiFi one.
You will not be able to connect it to WiFi, unless you replace the module with something that works with WiFi.
You can use this device with a Zigbee dongle and Home Assistant without changing the firmware.

I also couldn't find anything about it other than some mentions that it is a ZigBee device. Would like to play with it more thou



I already have some BK modules on order to replace this with and try.

Which modules exactly did you order?

You can also buy Zigbee dongle and use it to control this device.

I ordered this module - https://www.lcsc.com/product-detail/WiFi-Modules_TUYA-WB2S-csyd_C2844246.html

I know about ZigBee dongle but I don't have one right now to test.

It should be a good replacement. By the way, I am curious to see what is the original dump of such modules. Can you do a 2MB backup before flashing OBK?

Will do as soon as they arrive and post here.

Also looking into N models to buy, I have some ideas to implement them. If I find them I will do the same dump and post here.

There seem to be CB2S on that site you linked as well, have you seen that?

Ordered them just now as well

Will backup and post when they arrive.