Actually a two step process here.
1) Disable the blinking: setoption31 1
2) Turn off the LED: LedPower 0
If entered at the Console it should look something like this:
09:28:20 CMD: setoption31 1
09:28:20 RSL: stat/sonoff/RESULT = {"SetOption31":"ON"}
09:29:25 CMD: LedPower 0
09:29:25 RSL: stat/sonoff/RESULT = {"LedPower":"OFF"}
Found this to also be usefull:
LedPower Show current led power state as On or Off
LedPower 0 / off Turn led AND LedState Off
LedPower 1 / on Turn led On AND LedState Off
LedState Show current led state as 0 to 7
LedState 0 / off Disable use of LED as much as possible
LedState 1 / on Show power state on led (inverted for Sonoff Touch)
LedState 2 Show MQTT subscriptions as a led blink
LedState 3 Show power state and MQTT subscriptions as a led blink
LedState 4 Show MQTT publications as a led blink
LedState 5 Show power state and MQTT publications as a led blink
LedState 6 Show all MQTT messages as a led blink
LedState 7 Show power state and MQTT messages as a led blink
