@1technophile thanks for help, I restored all my hardware hacks that I did for ESPHome flashing (yes, exactly ESPurna’s guide) and… nothing. Unfortunately I tried 3 modes (PiLight, RF and RF2) and see no code at all (in ESPHome I saw some raw codes but that was even really hard to at least identify start and end of the sequence, I don’t talk about decoding, that’s why I decided to switch to OMG). I don’t know what’s the reason, may be PiLight is still not ready - I found this post: https://forum.pilight.org/showthread.php?tid=3351, not clear if they submitted their changes and released them or not.
PS: but thanks to flashing RF mode I was able to control QiaChip relays (Qiachip relay/switch), at least have some progress
Looks like RFLink supports this module, so probably I’ll build DIY RFLink for myself instead of SRFB, and will install SRFB at my parents, I plan to setup outdoor wireless light control, but have to say that ESPHome supports RCSwitch library as well, so for me there’s no reason to have OMG on SRFB. Thanks for help!