Perfect, thank you.
That solved all issues! Now working super fine.

Hi Carlierd,
Thanks for your questions and answers to yourself ;-)

Actually that helped me as I was mixing both types of RFM69.

Hi Jonathan,
Before I show my code, please check:

• Connect W5100 and radio like this

Arduino - Radio - Ethernet
13      - SCK   - SCK
12      - MISO  - MISO/SO
11      - MOSI  - MOSI/SI
10      - NSS (CS)
7       -       - SS/CS
2       - DIO0  -

Be sure to power the W5100 with 5V and the radio with 3v3!

Then, you need to modify the w5100.h file to disable radio interruption during SPI use:
Find

#else
  inline static void initSS()    { DDRB  |=  _BV(2); };
  inline static void setSS()     { PORTB &= ~_BV(2); };
  inline static void resetSS()   { PORTB |=  _BV(2); };
#endif

and replace with

#elif defined(W5100SPIPATCH)
  inline static void initSS()    { DDRD  |=  _BV(7); };
  inline static void setSS()     { cli(); PORTD &= ~_BV(7); };
  inline static void resetSS()   { PORTD |=  _BV(7); sei(); };
#endif

Then, downgrade the board manager "Arduino AVR boards" to version 1.6.11 and rebuild.

Finally, here is my working code:

/**
 * 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 Tomas Hozza <thozza@gmail.com>
 *
 *
 * DESCRIPTION
 * The EthernetGateway sends data received from sensors to the ethernet link.
 * The gateway also accepts input on ethernet interface, which is then sent out to the radio network.
 *
 * The GW code is designed for Arduino 328p / 16MHz.  ATmega168 does not have enough memory to run this program.
 *
 * LED purposes:
 * - To use the feature, uncomment MY_DEFAULT_xxx_LED_PIN in the sketch below
 * - 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/ethernet_gateway for wiring instructions.
 *
 */

// Enable debug prints to serial monitor
#define MY_DEBUG

// Enable and select radio type attached
#define MY_RADIO_RFM69
#define MY_RFM69_FREQUENCY RF69_433MHZ

// La définition des PIN ci dessous n'est pas nécessaire, car c'est celle de base
//#define MY_RF69_IRQ_PIN 2
//#define MY_RF69_SPI_CS 10

// Enable gateway ethernet module type
#define MY_GATEWAY_W5100

#define MY_IP_ADDRESS 192,168,0,22
#define MY_IP_SUBNET_ADDRESS 255,255,255,0
// The port to keep open on node server mode / or port to contact in client mode
#define MY_PORT 5003

// The MAC address can be anything you want but should be unique on your network.
// Newer boards have a MAC address printed on the underside of the PCB, which you can (optionally) use.
// Note that most of the Ardunio examples use  "DEAD BEEF FEED" for the MAC address.
#define MY_MAC_ADDRESS 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED

// 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


// Flash leds on rx/tx/err
#define MY_LEDS_BLINKING_FEATURE
// Set blinking period
#define MY_DEFAULT_LED_BLINK_PERIOD 300
#define MY_DEFAULT_ERR_LED_PIN 4  // Error led pin
#define MY_DEFAULT_RX_LED_PIN  5  // Receive led pin
#define MY_DEFAULT_TX_LED_PIN  6  // Transmit led pin


#if defined(MY_USE_UDP)
  #include <EthernetUdp.h>
#endif
#include <Ethernet.h>
#include <MySensors.h>


void setup() {
}

void presentation() {
}

void loop() {
 }
}

Hope it helped
Fred

Yes of course I used a level converter. Ordered the one proposed on the radio page. Works well!