ESPEasy/lib/SC16IS752/example/I2C_RECEIVE/README.md

I2C_RECEIVE

Connect RX(A-CH) and other Arduno TX at 9600 bps
Connect RX(B-CH) and other Arduno TX at 384000 bps

Connections should be as short as possible

Channel baudrate

You can specify different baudrates for channel A and channel B

Sketch of the other side

#define baudrate 9600L

void setup() {
  Serial.begin(baudrate);
}

void loop() {
  char buf[64];
  sprintf(buf,"Hello Wold, Baudrate is %ld", baudrate);
  Serial.println(buf);
  //Serial.println("Hello this is Arduino");
  delay(1000);
}