Sonoff Basic R3 DIY.
Set the jumper to DIY mode.
I connect 220V, the blue indicator blinks 1 long and 2 short continuously. After pressing the button, the blue indicator blinks 1 short continuously and does not connect to sonoffDiy wi-fi.
What is the problem?
I have the same issue.
A SonOff Basic R3 DIY with the DIY jumper in place. It doesn't connect to the SSID = sonoffDiy
PW = 20170618sn.
I have done the same procedure with two "SonOff Mini DIY" devices without problem.