Don't be scared 
, this time I'm not here to ask for help but to contribute.
The good news is that with all the hints received, yesterday I've been able to compile and upload the sketch to NodeMCU.
One year later (today ) I defined the NodeMCU in Domoticz,searched for sensors and everything is now properly working.
My next step now is to add a second sensor to the same NodeMCU but, should I face problems, I think I should start another topic to avoid confusion.
Bottom line... thank you for the help provided and here is the final working sketch that I hope will help someone else
/**
* The MySensors Arduino library handles the wireless radio link and protocol
* between your home built sensors/actuators and HA controller of choice.
* The sensors forms a self healing radio network with optional repeaters. Each
* repeater and gateway builds a routing tables in EEPROM which keeps track of the
* network topology allowing messages to be routed to nodes.
*
* Created by Henrik Ekblad <henrik.ekblad@mysensors.org>
* Copyright (C) 2013-2015 Sensnology AB
* Full contributor list: https://github.com/mysensors/Arduino/graphs/contributors
*
* Documentation: http://www.mysensors.org
* Support Forum: http://forum.mysensors.org
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
*******************************
*
* REVISION HISTORY
* Version 1.0 - Henrik EKblad
* Contribution by a-lurker and Anticimex,
* Contribution by Norbert Truchsess <norbert.truchsess@t-online.de>
* Contribution by Ivo Pullens (ESP8266 support)
*
* DESCRIPTION
* The EthernetGateway sends data received from sensors to the WiFi link.
* The gateway also accepts input on ethernet interface, which is then sent out to the radio network.
*
* VERA CONFIGURATION:
* Enter "ip-number:port" in the ip-field of the Arduino GW device. This will temporarily override any serial configuration for the Vera plugin.
* E.g. If you want to use the defualt values in this sketch enter: 192.168.178.66:5003
*
* LED purposes:
* - To use the feature, uncomment any of the MY_DEFAULT_xx_LED_PINs in your sketch, only the LEDs that is defined is used.
* - RX (green) - blink fast on radio message recieved. In inclusion mode will blink fast only on presentation recieved
* - TX (yellow) - blink fast on radio message transmitted. In inclusion mode will blink slowly
* - ERR (red) - fast blink on error during transmission error or recieve crc error
*
* See http://www.mysensors.org/build/esp8266_gateway for wiring instructions.
* nRF24L01+ ESP8266
* VCC VCC
* CE GPIO4
* CSN/CS GPIO15
* SCK GPIO14
* MISO GPIO12
* MOSI GPIO13
* GND GND
*
* Not all ESP8266 modules have all pins available on their external interface.
* This code has been tested on an ESP-12 module.
* The ESP8266 requires a certain pin configuration to download code, and another one to run code:
* - Connect REST (reset) via 10K pullup resistor to VCC, and via switch to GND ('reset switch')
* - Connect GPIO15 via 10K pulldown resistor to GND
* - Connect CH_PD via 10K resistor to VCC
* - Connect GPIO2 via 10K resistor to VCC
* - Connect GPIO0 via 10K resistor to VCC, and via switch to GND ('bootload switch')
*
* Inclusion mode button:
* - Connect GPIO5 via switch to GND ('inclusion switch')
*
* Hardware SHA204 signing is currently not supported!
*
* Make sure to fill in your ssid and WiFi password below for ssid & pass.
*/
// Enable debug prints to serial monitor
#define MY_DEBUG
// Use a bit lower baudrate for serial prints on ESP8266 than default in MyConfig.h
#define MY_BAUD_RATE 9600
// Enables and select radio type (if attached)
//#define MY_RADIO_NRF24
//#define MY_RADIO_RFM69
#define MY_GATEWAY_ESP8266
#define MY_ESP8266_SSID "*********"
#define MY_ESP8266_PASSWORD "**********"
// Enable UDP communication
//#define MY_USE_UDP
// Set the hostname for the WiFi Client. This is the hostname
// it will pass to the DHCP server if not static.
#define MY_ESP8266_HOSTNAME "sensor-gateway1"
// Enable MY_IP_ADDRESS here if you want a static ip address (no DHCP)
// #define MY_IP_ADDRESS 192,168,1,7
// If using static ip you need to define Gateway and Subnet address as well
// #define MY_IP_GATEWAY_ADDRESS 192,168,1,1
// #define MY_IP_SUBNET_ADDRESS 255,255,255,0
// The port to keep open on node server mode
#define MY_PORT 5003
// How many clients should be able to connect to this gateway (default 1)
#define MY_GATEWAY_MAX_CLIENTS 2
// Controller ip address. Enables client mode (default is "server" mode).
// Also enable this if MY_USE_UDP is used and you want sensor data sent somewhere.
//#define MY_CONTROLLER_IP_ADDRESS 192, 168, 178, 68
// Enable inclusion mode
#define MY_INCLUSION_MODE_FEATURE
// Enable Inclusion mode button on gateway
// #define MY_INCLUSION_BUTTON_FEATURE
// Set inclusion mode duration (in seconds)
#define MY_INCLUSION_MODE_DURATION 60
// Digital pin used for inclusion mode button
#define MY_INCLUSION_MODE_BUTTON_PIN 3
// Set blinking period
// #define MY_DEFAULT_LED_BLINK_PERIOD 300
// Flash leds on rx/tx/err
// Led pins used if blinking feature is enabled above
#define MY_DEFAULT_ERR_LED_PIN 16 // Error led pin
#define MY_DEFAULT_RX_LED_PIN 16 // Receive led pin
#define MY_DEFAULT_TX_LED_PIN 16 // the PCB, on board LED
#if defined(MY_USE_UDP)
#include <WiFiUdp.h>
#endif
#include <ESP8266WiFi.h>
// Start of the sensor specific code
#include <SPI.h>
#include <MySensors.h>
#include <pins_arduino.h>
#include <Bounce2.h>
#define CHILD_ID 0
Bounce debouncer = Bounce();
int oldValue=-1;
MyMessage msg(CHILD_ID, V_TRIPPED);
void setup()
{
// Setup reed switch with pull-up
pinMode(D0,INPUT_PULLUP);
// After setting up reed switch, setup debouncer
debouncer.attach(D0);
debouncer.interval(5);
}
void presentation()
{
// Present locally attached sensors here
present(CHILD_ID, S_DOOR);
}
// Check if digital input has changed and send in new value
void loop()
{
debouncer.update();
// Get the update value
int value = debouncer.read();
if (value != oldValue)
{
// Send in the new value
send(msg.set(value==HIGH ? 1 : 0));
oldValue = value;
}
}```
