Pinout and wiring diagram for TUYA DC 4CH WiFi relay ESP8266 for custom code

Hello forumers.
I have bought from a well-known portal TUYA DC 4CH Voltage free WiFi NO/NC relay
.

Do you perhaps have a diagram or recognised leads from the ESP for the relays and buttons.
I need this to write my own control code.
Best regards

Rather a diagram is not available, but you could look for Tasmota's template here:
https://templates.blakadder.com/
Although without a specific model it's hard.

On the other hand just searching the GPIOs is not a problem, in Tasmota for example you even manually set 4 consecutive GPIOs per Relay and investigate if something happens as you switch their state.

Thank you mate for your reply.
This is how I am going to test the pins experimentally, just waiting for the programmer - maybe it will arrive today.
The board has a USB socket for 5V power only.

The link to Tasmota is also interesting and I will use something on it.
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If anyone would like to use this module for their own purposes, I will hint that there are two processors on board: an ESP8285 for WiFi and a hk32f030mf4p6 for DI and DO.

Regards.