Hi,

if I don't set any speed, I get only garbage, I tested all the following speeds:

300
600
750
1200
2400
4800
9600
19200
31250
38400
57600
74880
115200
230400
250000
460800
500000
921600
1000000
2000000

Always garbage

But if I explicitly set `Serial.begin(x)` then it works flawless

So, what's ...