Anenji 4200W - I replaced the standard WiFi EB-WFBLE-03 with an ESP32 module for HA

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Hi,

I've been playing around with an Anenji 4200W inverter recently and the new version of it, instead of an RS232 port, has a built-in Wi-Fi module that broadcasts forcefully to some crooked Chinese portal. I unscrewed this module, soldered the suspect CPU (EB-WFBLE-03) out of it and crammed in the JST 5-pin connector that corresponds to the RS232 from the inverter to the module. In this way I was able to replace this crap with an ESP32 module and thus put all the data (MODBUS-RTU) into the homeassistant. Despite the soldering out of the CPU, the RS485 to the BMS still works

I'm throwing up a repo with what I was able to figure out:
https://github.com/psalkiewicz/esphome-2026-anenji4200/

Feel free to discuss if you have any ideas or similar thoughts with this repo.

And what kind of Wi-Fi module is sitting there from the factory? Maybe there is an SDK for it? The name EB-WFBLE-03 says little, do you have any pictures?

>>21878332


Added after 7 minutes:

>>21878350 It would seem the easiest thing to do would be to reflash it, but there's no word anywhere about this microcontroller (only in the context of the people who took Anenji apart). It's some kind of Eybond or something. A chip heavily hype in itself, which is why I preferred to substitute the well-known and well-liked ESP32.

And it's probably pre-programmed to transmit to their cloud curve, as of the pins it only has vdd, gnd, rx, tx (rs232 to the inverter) and antenna. I don't think it can be easily re-flashed.

Do you have the ability to take a picture of the screen to look there? Even if there is no SDK, maybe there is a flash bone to solder? Or is it something , which is already supported by our electrode project?
Multi-platform IoT firmware supporting up to 32 platforms - summary of OBK 2025

I've soldered it out to be thrown away anyway, so when I find a moment I'll unsolder that screen, then I'll post what's inside.

Thanks, every new chip is a chance to expand the project. Probably @divadiow and @insmod would also be interested in at least a memory dump.

>>21878361

Very interesting, at first glance this layout does not even exist on Google. EB-1088

>>21878366 Sorry for the ugly pics but I took a picture of a Chinese microscope with my phone. Inside is a 26MHz quartz and some unknown processor. But it looks like some total crap - now I understand why it took ages to read the data from the inverter.

Added after 4 [minutes]:

This EB could mean EYBOND which is the manufacturer of this whole wifi module. They could have printed their marks on some crooked chip. And below it looks like the date 2025-12 so it's possible this was created for a specific product a while ago. That's how, at the end of the year, Anenji released an inverter that had this crap instead of a derived RS-232.

Added after 8 [minutes]:

>>21878370 The logo matches the EYBOND logo. And the chip is probably oem. Some kind of Beken 7231 or something like that looking at the eye by the features, the number of pins and judging that it is rather nothing particularly new.

And does the 'fingerprint' match? Beken has an oscillator on pins 30 and 31 (XO and XI):

>>21878380


As far as I can see, 31,32 go to the quartz

oh. you've unsoldered main IC

did you capture boot log or anything from uarts?