{"NAME":"LilyGo T-RelayS3","GPIO":[8352,1,1,1,1,8288,8320,8384,1,1,1,1,1,1,1,1,640,608,1,1,1,1,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1],"FLAG":0,"BASE":1}

Note: this template configures LEDs as relays 7 and 8 for some reason!

Compile Tasmota with these options:

#define USE_SHIFT595
#define USE_RTC_CHIPS               
#define USE_DS3231                 
#define USE_RTC_ADDR    0x51

If you have an extension board, you need to do one more thing to enable it. Go to consoles menu, the first option (Console) and type this command: Shift595DeviceCount 2

Number 2 means that you have 2 devices (main+extensions). If you have 2 extension, put 3, and so. on…