# Ethernet3 v1.5.x
Ethernet library for Arduino and Ethernetshield2 / WIZ550io / WIZ850io / USR-ES1 with Wiznet W5500 chip
based on the Ethernet2 library of arduino.org

I added many new functionalities.

## new in 1.5
- custom hostname for DHCP
- the PHY is configurable
- Wake on LAN
- added new example for webclient "WebClientReadResponse.ino"

You need to include

```cpp
#include <Ethernet3.h> // instead Ethernet.h
#include <EthernetUdp3.h> // instead EthernetUdp.h for UDP functionality
```

## Custom Hostname

For use with DHCP you can set a custom hostname, this must be done before Ethernet.begin(mac).

```cpp
Ethernet.setHostname(char* hostname);
```

## PHY Configuration

The PHY is now configurable, this must done after Ethernet.begin()
Following modes are possible:
HALF_DUPLEX_10,
FULL_DUPLEX_10,
HALF_DUPLEX_100,
FULL_DUPLEX_100,
FULL_DUPLEX_100_AUTONEG,
POWER_DOWN,
ALL_AUTONEG (default)

```cpp
Ethernet.phyMode(phyMode_t mode);
```

## Wake on LAN

You can set the Wake on LAN functionality

```cpp
Ethernet.WoL(bool wol);
```

## what's next

In version 2 there will mDNS and a large code cleanup

A new NTP library is published https://github.com/sstaub/NTP

## New init procedure **!!!**

The init of the Ethernetinterface changed, the ordner is now:

```cpp
Ethernet.begin(mac, ip, subnet, gateway, dns);
```

This is more logical.

    
## Multicast support

Multicast for udp added. You need to set the Multicast IP address and port to listen.

***example***

```cpp
EthernetUdp udp
upd.beginMulticast(multicastIP, port);
```

## Unicast blocking support

An Unicast blocking function is added to set and get the flag in a UDP socket.

```cpp
void setUnicastBlock(bool block);
bool getUnicastBlock();
```

***example***

```cpp
EthernetUDP udp;
udp.setUnicastBlock(true); // to restore the value to standard
udp.setUnicastBlock(false);
udp.setUnicastBlock();
```

## PHY support

Added some function to read the PHYCFGR in Ethernet3.

```cpp
uint8_t phyState(); // returns the PHYCFGR
uint8_t link(); // returns the linkstate, 1 = linked, 0 = no link
const char* linkReport(); // returns the linkstate as a string
uint8_t speed(); // returns speed in MB/s
const char* speedReport(); // returns speed as a string
uint8_t duplex(); // returns duplex mode 0 = no link, 1 = Half Duplex, 2 = Full Duplex
const char* duplexReport(); // returns duplex mode as a string
```

***example***

```cpp
Serial.println(Ethernet.linkReport()); 
```

## MAC address

Added some function to read the MAC address in Ethernet3, this is helpfull when you use Wiznet boards like WIZ550io with build in MAC address.

```cpp
void macAddress(uint8_t mac[]); // get the MAC Address
const char* macAddressReport(); // returns the the MAC Address as a string
```

***example***

```cpp
uint8_t mac[6]; // array for mac address
Ethernet.macAddress(mac);
```

## Socket RAM-Size

You can de- or increase the RAM-Size for the sockets, this must be done before Ethernet.begin(...)

The possible socketnumbers are:

```cpp
Ethernet.init(1); -> 1 Socket with 16k RX/TX buffer
Ethernet.init(2); -> 2 Socket with 8k RX/TX buffer
Ethernet.init(4); -> 4 Socket with 4k RX/TX buffer
Ethernet.init(); -> 8 Socket with 2k RX/TX buffer
```

Be carefull with the MAX_SOCK_NUM in w5500.h , it cannot changed dynamicly.

***example***

```cpp
Ethernet.init(4); // reduce to 4 Socket, each with 4k RX/TX buffer
Ethernet.begin();
```
    
## RST and CS pin settings

You can set the CS and (Hardware) RST (e.g. WIZ550io or USR-ES1), this must be done before Ethernet.begin(...)

Standard is Pin 10 for CS and Pin 9 for RST

```cpp
Ethernet.setCsPin(3); // set Pin 3 for CS
Ethernet.setRstPin(4); // set Pin 4 for RST
```

***example***

```cpp
Ethernet.setRstPin(); // set Pin 9 for RST
Ethernet.begin();
```

## Hard- and Software Reset

Two new functions to make resets, Softreset can done only after Ethernet.begin(...)

For Hardware Reset you need to set the Pin number.

```cpp
Ethernet.softreset(); // performs a software reset
Ethernet.hardreset(); // performs a hardware reset
```

***example***

```cpp
Ethernet.setRstPin(); // set Pin 9 for RST
Ethernet.begin();
Ethernet.hardreset();
```

## Additional TCP settings in Ethernet

There are two function to set and get the retransmission timeout and retry count, this helps to solve problem with TCP connections with unexpected very long timeouts.  Beware the the timeout value multiplier is 100us!

```cpp
void Ethernet.setRtTimeOut(uint16_t timeout);
uint16_t Ethernet.getRtTimeOut();
void Ethernet.setRtCount(uint8_t count);
uint8_t Ethernet.getRtCount();
```

***example***

```cpp
Ethernet.setRtTimeOut(500); // timeout 50ms
Ethernet.setRtCount(2);
	
// to restore the value to standard	
Ethernet.setRtTimeOut();
Ethernet.setRtCount();
```

## Additional settings in EthernetClient

### ACK feature

A 'No Delayed ACK' function is added to set and get the flag in a TCP socket.

```cpp
void setNoDelayedACK(bool ack);
bool getNoDelayedACK();
```

***example***

```cpp
EthernetClient tcp;
tcp.setNoDelayedACK(true);
	
// to restore the value to standard
tcp.setNoDelayedACK(false);
tcp.setNoDelayedACK();
```

### remoteIP and remoteMAC adresses

Two new functions for getting the IP and MAC address of a remote host.

```cpp
void remoteIP(uint8_t *ip);
void remoteMAC(uint8_t *mac);
```
	
## Additional settings in EthernetUDP

### Broadcast feature in EthernetUDP

A Broadcast blocking function is added to set and get the flag in a UDP socket.

```cpp
void setBroadcastBlock(bool block);
bool getBroadcastBlock();
```

***example***

```cpp
EthernetUDP udp;
udp.setBroadcastBlock(true);
	
// to restore the value to standard
udp.setBroadcastBlock(false);
udp.setBroadcastBlock();
```
	
### remoteIP and remoteMAC adresses

Two new functions for getting the IP and MAC address of a remote host.

```cpp
void remoteIP(uint8_t *ip);
void remoteMAC(uint8_t *mac);
```