Serial Ports seems to not work anymore

[dardoro]

It works for me...
This simple Arduino sketch responds with the letter next to the received one.
Tested on ESP8266.

Echo.ino

void setup() {
  Serial.begin( 115200);
  while (!Serial) {}
}

void loop() {
  if (Serial.available()) {
      Serial.print( "Echo:");
      Serial.write(Serial.read()+1);
  }
}

side, A >> B