#include <SoftwareSerial.h>
SoftwareSerial mySerial(4, 5); // RX, TX

void check(long speed) {
  Serial.print("Speed ");
  Serial.print(speed);
  Serial.print(", _tx_delay ");
  mySerial.begin(speed);
}

void setup() {
  const char info[] = "soser TX 5 " __DATE__  " " __TIME__;
  Serial.print(info);
  Serial.begin(38400);
  Serial.println(info);
}

void loop() {
  check(9600);
  check(38400);
  check(115200);
  check(250000);
  check(256000);
  check(460800);
  check(38400);
  check(230400);
  mySerial.println("Alle meine Entchen jump over the lazy dog");
  delay(2000);
}