node-serial gets chunked data from serial1

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I'm trying to get an arduino sending data to node but with no success.
I'm connecting to an ar-drone 2.0 as in droneduino · GitHub

Here is my Arduino code:

        #include <TinyGPS++.h>
        #include <SoftwareSerial.h>
        #include <Wire.h>
        #include "Adafruit_HTU21DF.h"
        /*
          Sketch per creare json contenente
          lat,lon,data,ora,temp, hum
        */
        static const int GPS_RXPin = 16, GPS_TXPin = 10;
        static const uint32_t GPSBaud = 9600;


        Adafruit_HTU21DF htu = Adafruit_HTU21DF();

        // The TinyGPS++ object
        TinyGPSPlus gps;

        // The serial connection to the GPS device
        SoftwareSerial ss(GPS_RXPin, GPS_TXPin);

        //JSON
        const size_t bufferSize = JSON_OBJECT_SIZE(6);
        DynamicJsonBuffer jsonBuffer(bufferSize);
        JsonObject& oData = jsonBuffer.createObject();

        void setup()
        {
          Serial1.begin(9600);
          Serial.begin(9600);
          ss.begin(GPSBaud);
          if (!htu.begin()) {
            Serial1.println("Couldn't find Adafruit_HTU21DF!");
            while (1);
          }
        }

        void loop()
        {
          float lat = gps.location.lat();
          float lon = gps.location.lng();
          float date = gps.date.value();
          float timestamp = gps.time.value();
          float temp = htu.readTemperature();
          float hum = htu.readHumidity();

          Serial1.print(lat);
          Serial1.print(";");
          Serial1.print(lon);
          Serial1.print(";");
          Serial1.print(date);
          Serial1.print(";");
          Serial1.print(timestamp);
          Serial1.print(";");
          Serial1.print(temp);
          Serial1.print(";");
          Serial1.print(hum);
          Serial1.println(";");

          //////

          Serial.print(lat);
          Serial.print(";");
          Serial.print(lon);
          Serial.print(";");
          Serial.print(date);
          Serial.print(";");
          Serial.print(timestamp);
          Serial.print(";");
          Serial.print(temp);
          Serial.print(";");
          Serial.print(hum);
          Serial.println(";");

          smartDelay(1000);
          if (millis() > 5000 && gps.charsProcessed() < 10)
            Serial1.println(F("No GPS data received: check wiring"));
        }

        // This custom version of delay() ensures that the gps object
        // is being "fed".
        static void smartDelay(unsigned long ms)
        {
          unsigned long start = millis();
          do
          {
            while (ss.available())
              gps.encode(ss.read());
          } while (millis() - start < ms);
        }

and this my NodeJS code:

        var serialport = require('node-serialport');
        var WebSocketServer = require('ws').Server;

        var wss = new WebSocketServer({host:'0.0.0.0',port: 9999});
        var sp = new serialport.SerialPort("/dev/ttyO3", {
          parser: serialport.parsers.readline("\n"),
          baud: 9600,
          buffersize: 65536
        });

        wss.on('connection', function(ws) {
          ws.send('connected');
          ws.on('message', function(message) {
            console.log('received: %s', message);
          });
          sp.on('data', function(chunk) {
            var fromArduino = chunk.toString();
            ws.send(fromArduino);
            console.log(fromArduino);
          });
        });

While the CSV comes out nice on Arduino IDE serial monitor, it is all messed up both on ws and node console.

1366×768 172 KB

I'm using this version of NodeJS and node-serial: https://github.com/felixge/node-cross-compiler/downloads

and set ttyO3 as in droneduino · GitHub

A voltage diveder is set between drone RX and Arduino TX1 to lower signal from 5v to 1.8v.

Thanks for any help!

Lorenzo