Brief test, pairing and interior of the Zamel ROW-02 (double-overhead light switch)

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Today we will take a look inside another IoT gadget, but this time working with the Polish Supla system. We will see how it is built, how the power path is realised, what WiFi module is inside and, in addition, we will try to pair it with the Supla cloud and maybe back up its firmware too. We'll see.

To start with, the product seems to be quite expensive:
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So what do we get for a whole £150?
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Including a Polish-language manual:
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Here is the gadget itself:
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Pairing with Supla .
Pairing with the Supla is based on pressing the RESET button and then connecting to the broadcast WiFi point (no password).
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We then visit 192.168.4.1 (hosted by our device) and enter our WiFi network details there, as well as our server and the email of our Supla account. The server from our Supla account can be found in the Supla panel.
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We then press "Save and reset" or reset with a physical button on the device. The device should appear in our panel:
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This particular module (ROW-02) offers two channels and can control two lights.
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Of course, you can choose their icons, names, etc.
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You can also trigger actions with it, but I have already written about that in another topic.
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More in the topic:
Pairing and configuring Supla devices without a mobile phone

Interior of Zamel ROW-02 .
Similar to Tuya products - lift the lid:
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The tracks for the higher powers are additionally tinned.
You can already see the first circuit - the EA1721A. Or rather, probably a TEA1721A. So here, however, is a switching power supply in flyback topology? I have often seen non-isolated step-down converters in such products.
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We look further afield:
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And from the top of the tiles:
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I don't see a pulse transformer here, so not a flyback after all! I guess the TEA1721 can work in other topologies too. I found other schematics on it:
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That is, however, again a non-isolated circuit. But he generates the voltage for the relay, for the WiFi module there is separately still a small step down inverter:
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And then there is the WiFi module:

ESP-WROOM-02, or ESP8266.
Outputs:
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For the "principle" I connected a USB to UART converter and ripped the flash, but that's probably off topic, as the Supli is unlikely to need to be converted to Tasmota.
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My copies of the IoT batches:
https://github.com/openshwprojects/FlashDumps/tree/main/IoT

Summary .
Indeed I like the Supla environment, the pairing is simpler than in Chinese systems and does not require a phone, as I have already written about. Additionally, you don't need to buy a ready-made one at all, because Supla is open source and can be uploaded to devices just like Tasmota. I.e. if you buy a Tuya product you can upload Supla or OpenBeken yourself, depending on what is inside....
It's a bit of a pity that the mentioned varistor didn't appear inside (as in some Sonoff products) - so there will be a downside here. Perhaps in other/newer versions this will be corrected.
Users remark on the high stability of operation compared to cheaper Sonoff versions. I will therefore leave the final verdict to you anyway - does anyone use the ROW-02 or similar?