ESP32 - Onewire library

I've downloaded the firmware above and flashed with that:

process.env
={
  "VERSION": "1v91.374",
  "BUILD_DATE": "Mar  4 2017",
  "BUILD_TIME": "13:37:12",
  "GIT_COMMIT": "5e9489ee5936f24d2684588ff42393b76105cb23",
  "BOARD": "ESP32",
  "CHIP": "ESP32",
  "CHIP_FAMILY": "ESP32",
  "FLASH": 0, "RAM": 524288,
  "SERIAL": "240ac400-2f90",
  "CONSOLE": "Serial1",
  "EXPORTS": { "jsvLock": 1074761212, "jsvLockAgainSafe": 1075125944, "jsvUnLock": 1074763152, "jsvSkipName": 1074778216,
    "jsvMathsOp": 1074787824, "jsvMathsOpSkipNames": 1074791308, "jsvNewFromFloat": 1074773388, "jsvNewFromInteger": 1074773300, "jsvNewFromString": 1074772312,
    "jsvNewFromBool": 1074773360, "jsvGetFloat": 1074782172, "jsvGetInteger": 1074776600, "jsvGetBool": 1074782920, "jspeiFindInScopes": 1074800584,
    "jspReplaceWith": 1074800352, "jspeFunctionCall": 1074809836, "jspGetNamedVariable": 1074802216, "jspGetNamedField": 1074802600, "jspGetVarNamedField": 1074802708,
    "jsvNewWithFlags": 1074772040 }
 }

Using:

var p;
if ( process.env.CHIP_FAMILY == 'ESP8266' ) p=NodeMCU.D4;
else p = D23;
var ow = new OneWire(p);
ow.reset();
var d=require("DS18B20");
var sensor = d.connect(ow);
console.log(sensor.getTemp());
console.log(sensor.getTemp());
console.log(ow.search());

I have two sensors connected and see:

 _____                 _
|   __|___ ___ ___ _ _|_|___ ___
|   __|_ -| . |  _| | | |   | . |
|_____|___|  _|_| |___|_|_|_|___|
          |_| http://espruino.com
 1v91.374 Copyright 2016 G.Williams
Espruino is Open Source. Our work is supported
only by sales of official boards and donations:
http://espruino.com/Donate
>24.9375
24.9375
[
  "28cc2e230500006b",
  "283260dc04000001"
 ]
=undefined
>