char buffer[5];

void setup() {
  Serial.begin(115200);
  Serial.println('Begin...');
}

void loop() {
  if (Serial.available()) {
    String data = Serial.readStringUntil('\n');
    data.toCharArray(buffer, sizeof(buffer));
    float valueF = strtod(buffer, NULL);
    Serial.print("Value double:");Serial.println(valueF);

    long valueI = strtol(buffer, NULL, 10);
    Serial.print("Value long:");Serial.println(valueI);
  }

}