Ethernet is a family of computer networking technologies commonly used in local area networks (LANs) and metropolitan area networks (MANs). It describes how networked devices can format data for transmission to other network devices, and how to put that data out on the network connection.

Ethernet is one of the most important interfaces of the ConnectCore 8M Mini SBC as it plays a critical role accessing Internet and communicating with other devices.

The ConnectCore 8M Mini SBC provides one Gigabit Ethernet interface for networking communication. You can find more information about it in the ConnectCore 8M Mini Hardware Reference Manual.

Digi adds a new API to Android that allows you to manage this Ethernet interface. You can enable, disable, or reset the interface in addition to reading and changing its configuration. In the Digi APIx javadoc you can find a complete list of the available methods in this API.

Unless noted, all API methods require the android.permission.ACCESS_NETWORK_STATE and/or android.permission.CHANGE_NETWORK_STATE permissions, depending on whether you are accessing or changing the Ethernet configuration.

If your application does not have the android.permission.ACCESS_NETWORK_STATE and/or android.permission.CHANGE_NETWORK_STATE permissions, it will not have access to any Ethernet service feature.

First you have to instantiate the EthernetManager object by passing the Android Application Context.

Instantiating the EthernetManager
import android.app.Activity;
import android.os.Bundle;

import com.digi.android.ethernet.EthernetManager;

public class EthernetSampleActivity extends Activity {

    EthernetManager ethernetManager;

    [...]

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Instantiate the Ethernet manager object.
        ethernetManager = new EthernetManager(this);

        [...]
    }

    [...]
}

Read the current configuration

The EthernetManager class allows you to read the current interface configuration using the following methods:

Method Description

getInterfaceName()

Returns the Ethernet interface name

getConnectionMode()

Returns the configured connection mode of the interface: EthernetConnectionMode.DHCP, EthernetConnectionMode.STATIC, or EthernetConnectionMode.UNKNOWN

getIp()

Returns the configured IP address of the interface

getNetmask()

Returns the configured netmask address of the interface

getGateway()

Returns the configured gateway address of the interface

getDns1()

Returns the configured DNS1 address of the interface

getDns2()

Returns the configured DNS2 address of the interface

getMacAddress()

Returns the MAC address of the interface

isConnected()

Returns whether the interface is connected or not

isEnabled()

Returns whether the interface is enabled or not

The getMacAddress() method may fail if the configured interface is null, throwing a NullPointerException.

Reading the interface configuration
import com.digi.android.ethernet.EthernetManager;

[...]

EthernetManager ethernetManager = ...;

[...]

if (ethernetManager.isEnabled && ethernetManager.isConnected) {
    System.out.println("Name: " + ethernetManager.getInterfaceName());
    System.out.println("MAC Address: " + ethernetManager.getMacAddress());
    System.out.println("Mode: " + ethernetManager.getConnectionMode());
    System.out.println("IP: " + ethernetManager.getIp());
    System.out.println("Netmask: " + ethernetManager.getNetmask());
    System.out.println("Gateway: " + ethernetManager.getGateway());
    System.out.println("DNS1: " + ethernetManager.getDns1());
    System.out.println("DNS2: " + ethernetManager.getDns2());
}

[...]
All these operations require the android.permission.ACCESS_NETWORK_STATE permission.

Configure the interface

It is also possible to configure and enable or disable the Ethernet interface using this API. You can use these methods to achieve it:

Method Description

configureInterface(EthernetConfiguration)

Configures the interface with the given configuration. It requires an EthernetConfiguration object. Note that this method resets the interface to apply the changes

setEnabled(boolean)

Enables or disables the interface

resetInterface()

Resets the interface

The configureInterface(EthernetConfiguration) method may fail for the following reasons:

  • If the given configuration is null, throwing a NullPointerException.

  • If the given IP address cannot be resolved, throwing an UnknownHostException.

The EthernetConfiguration class offers a series of methods to fill and read the configuration object:

Method Description

setConnectionMode(EthernetConnectionMode)

Sets the Ethernet connection mode

getConnectionMode()

Returns the Ethernet connection mode

setInterfaceName(String)

Sets the interface name

getInterfaceName()

Returns the interface name

`setIpAddress(InetAddress)

Sets the IP address

getIpAddress()

Returns the IP address

setGateway(InetAddress)

Sets the gateway address

getGateway()

Returns the gateway address

setNetMask(InetAddress)

Sets the net mask address

getNetMask()

Returns the net mask address

setDns1Addr(InetAddress)

Sets the DNS 1 address

getDns1Addr()

Returns the DNS 1 address

setDns2Addr(InetAddress)

Sets the DNS 2 address

getDns2Addr()

Returns the DNS 2 address
Changing the interface configuration
import com.digi.android.ethernet.EthernetManager;
import com.digi.android.ethernet.EthernetConfiguration;
import com.digi.android.ethernet.EthernetConnectionMode;

import java.net.InetAddress;

[...]

EthernetManager ethernetManager = ...;

[...]

// Enable the interface if it isn't.
if (!ethernetManager.isEnabled())
    ethernetManager.setEnabled(true);

// Set a static configuration.
EthernetConfiguration config = new EthernetConfiguration();
config.setInterfaceName(ethernetManager.getInterfaceName());
config.setConnectionMode(EthernetConnectionMode.STATIC);
config.setIp(InetAddress.getByName("192.168.1.150"));
config.setNetmask(InetAddress.getByName("255.255.255.0"));
config.setGateway(InetAddress.getByName("192.168.1.1"));
config.setDns1(InetAddress.getByName("8.8.8.8"));

ethernetManager.configureInterface(config);

[...]
All these operations require the android.permission.CHANGE_NETWORK_STATE permission.