本文基于IDO-SBC3566-V1B Android11系统实现开机后以太网自动共享4G网络功能。

IDO-SBC3566基于瑞芯微RK3566研发的一款高性能低功耗的智能主板，采用四核A55,主频高达1.8GHz，专为个人移动互联网设备和AIOT设备而设计，内置了多种功能强大的嵌入式硬件引擎，为高端应用提供了优异的性能，支持几乎全格式的4K编解码，内置3DGPU，能够完全兼容OpenGL ES1.1/2.0/3.2、OpenCL2.0和Vulkan1.0.特殊的MMU2D硬件引擎，此外，凭借其强大的兼容性，可以轻松地转换基于TensorFlow/MXNet/PyTorch/Caffe等一系列框架的网络模型。

支持Android，Linux，OpenHarmony，麒麟OS等多种操作系统，可广泛应用于平板、教育平板、带屏音箱、词典笔、云终端、视频会议系统等安卓/Linux类应用方案，以及其他带屏消费类、或轻量级AI应用场景。

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添加以太网共享服务

在源码目录下新建以太网共享服务文件，实现系统开机启动时开启以太网共享。

packages/apps/Settings/src/com/android/settings/StartEth1ShareRunnable.java

文件内容如下：

package com.android.settings;//以太网共享
import android.app.Service;
import android.content.Context;
import android.os.Handler;
import android.util.Log;
import android.content.Intent;
import android.os.IBinder;import android.net.ConnectivityManager;
import static android.net.TetheringManager.TETHERING_ETHERNET;
import android.net.ConnectivityManager.OnStartTetheringCallback;public class StartEth1ShareRunnable extends Service {private static final String TAG = "StartEth1ShareRunnable";private Context mContext;//以太网共享private ConnectivityManager mCm;private OnStartTetheringCallback mStartTetheringCallback;@Overridepublic IBinder onBind(Intent arg0) {// TODO Auto-generated method stubreturn null;}@Overridepublic void onCreate() {super.onCreate();mCm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);mStartTetheringCallback = new OnStartTetheringCallback();mHandler.post(StartEth1ShareRunnable);//启用以太网}private Handler mHandler = new Handler();private class OnStartTetheringCallback extends ConnectivityManager.OnStartTetheringCallback {@Overridepublic void onTetheringStarted() {Log.d(TAG, "ethernet onTetheringStarted!\n");}@Overridepublic void onTetheringFailed() {Log.e(TAG, "ethernet onTetheringFailed!\n");}}//以太网共享private Runnable StartEth1ShareRunnable = new Runnable() {@Overridepublic void run() {try {if (mCm != null)mCm.startTethering(TETHERING_ETHERNET, true, mStartTetheringCallback, mHandler);//开启以太网共享} catch (Exception e) {Log.e(TAG, "ethernet startTethering error!\n");e.printStackTrace();mHandler.postDelayed(StartEth1ShareRunnable, 10000);//延迟10秒后重新执行}}};
}

在packages/apps/Settings/src/com/android/settings/ 添加一个广播 MyBootReceiver.java 用于接收启动完成事件，在收到广播后调用StartEth1ShareRunnable服务

package com.android.settings;import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;public class MyBootReceiver extends BroadcastReceiver {@Overridepublic void onReceive(Context context, Intent intent) {// TODO Auto-generated method stubString action = intent.getAction();if (action.equals(Intent.ACTION_BOOT_COMPLETED)){Intent service = new Intent(context, StartEth1ShareRunnable.class);context.startService(service);}}
}

功能验证

SBC3566主板插入可使用的EC20 4G模块以及SIM卡，如下图所示：

  

从SBC3566主板网口接一根网线到另外一块主板网口上，并给两个主板供电。

在SBC3566系统查看网口及4G获取的IP

共享的网口网络IP：192.168.5.1 4G网卡IP：10.47.102.124

console:/ # ifconfig
eth0 Link encap:Ethernet HWaddr 02:ed:83:f3:50:c4 Driver rk_gmac-dwmacinet addr:192.168.5.1  Bcast:192.168.5.255  Mask:255.255.255.0inet6 addr: fe80::7a78:d959:9bff:28cd/64 Scope: LinkUP BROADCAST RUNNING MULTICAST MTU:1500  Metric:1RX packets:133 errors:0 dropped:0 overruns:0 frame:0TX packets:158 errors:0 dropped:0 overruns:0 carrier:0collisions:0 txqueuelen:1000RX bytes:17758 TX bytes:37405Interrupt:38ppp0 Link encap:Point-to-Point Protocolinet addr:10.47.102.124  P-t-P:10.64.64.64  Mask:255.255.255.255UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500  Metric:1RX packets:104 errors:0 dropped:0 overruns:0 frame:0TX packets:111 errors:0 dropped:0 overruns:0 carrier:0collisions:0 txqueuelen:3RX bytes:27734 TX bytes:11416

通过ping 百度地址能正常上网

console:/ # ping www.baidu.com
PING www.baidu.com (157.148.69.74) 56(84) bytes of data.
64 bytes from 157.148.69.74: icmp_seq=1 ttl=52 time=32.8 ms
64 bytes from 157.148.69.74: icmp_seq=2 ttl=52 time=24.0 ms
64 bytes from 157.148.69.74: icmp_seq=3 ttl=52 time=24.1 ms
64 bytes from 157.148.69.74: icmp_seq=4 ttl=52 time=24.4 ms
64 bytes from 157.148.69.74: icmp_seq=5 ttl=52 time=23.8 ms
64 bytes from 157.148.69.74: icmp_seq=6 ttl=52 time=24.1 ms
64 bytes from 157.148.69.74: icmp_seq=7 ttl=52 time=25.4 ms
64 bytes from 157.148.69.74: icmp_seq=8 ttl=52 time=24.7 ms
^C
--- www.baidu.com ping statistics ---
8 packets transmitted, 8 received, 0% packet loss, time 7012ms
rtt min/avg/max/mdev = 23.808/25.447/32.874/2.852 ms

另外一块主板通过网络共享获取到的IP 为192.168.5.X网段

console:/ # ifconfig
eth1 Link encap:Ethernet HWaddr 3a:1d:f7:26:49:0a Driver r8168inet addr:192.168.5.199  Bcast:192.168.5.255  Mask:255.255.255.0inet6 addr: fe80::4a59:7a31:cc45:1b53/64 Scope: LinkUP BROADCAST RUNNING MULTICAST MTU:1500  Metric:1RX packets:286671 errors:0 dropped:0 overruns:0 frame:0TX packets:586 errors:0 dropped:0 overruns:0 carrier:0collisions:0 txqueuelen:1000RX bytes:27238966 TX bytes:64962Interrupt:169 Base address:0x3000

通过测试可以ping通互联网网址

console:/ # ping www.baidu.com
PING www.baidu.com (157.148.69.74) 56(84) bytes of data.
64 bytes from 157.148.69.74: icmp_seq=1 ttl=51 time=37.7 ms
64 bytes from 157.148.69.74: icmp_seq=2 ttl=51 time=28.7 ms
64 bytes from 157.148.69.74: icmp_seq=3 ttl=51 time=22.9 ms
64 bytes from 157.148.69.74: icmp_seq=4 ttl=51 time=23.2 ms
64 bytes from 157.148.69.74: icmp_seq=5 ttl=51 time=23.4 ms
64 bytes from 157.148.69.74: icmp_seq=6 ttl=51 time=48.0 ms
64 bytes from 157.148.69.74: icmp_seq=7 ttl=51 time=23.0 ms
64 bytes from 157.148.69.74: icmp_seq=8 ttl=51 time=24.9 ms
64 bytes from 157.148.69.74: icmp_seq=9 ttl=51 time=69.8 ms
^C
--- www.baidu.com ping statistics ---
9 packets transmitted, 9 received, 0% packet loss, time 8012ms
rtt min/avg/max/mdev = 22.930/33.577/69.879/15.184 ms