本文基于IDO-SBC3566-V1B Android11系統實現開機后以太網自動共享4G網絡功能

IDO-SBC3566基于瑞芯微RK3566研發的一款高性能低功耗的智能主板，采用四核A55,主頻高達1.8GHz，專為個人移動互聯網設備和AIOT設備而設計，內置了多種功能強大的嵌入式硬件引擎，為高端應用提供了優異的性能，支持幾乎全格式的4K編解碼，內置3DGPU，能夠完全兼容OpenGL ES1.1/2.0/3.2、OpenCL2.0和Vulkan1.0.特殊的MMU2D硬件引擎，此外，憑借其強大的兼容性，可以輕松地轉換基于TensorFlow/MXNet/PyTorch/Caffe等一系列框架的網絡模型。

支持Android，Linux，OpenHarmony，麒麟OS等多種操作系統，可廣泛應用于平板、教育平板、帶屏音箱、詞典筆、云終端、視頻會議系統等安卓/Linux類應用方案，以及其他帶屏消費類、或輕量級AI應用場景。

產品規格書：IDO-SBC3566-V1B 產品手冊

添加以太網共享服務

在源碼目錄下新建以太網共享服務文件，實現系統開機啟動時開啟以太網共享。

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

文件內容如下：

packagecom.android.settings;

//以太網共享
importandroid.app.Service;
importandroid.content.Context;
importandroid.os.Handler;
importandroid.util.Log;
importandroid.content.Intent;
importandroid.os.IBinder;

importandroid.net.ConnectivityManager;
importstaticandroid.net.TetheringManager.TETHERING_ETHERNET;
importandroid.net.ConnectivityManager.OnStartTetheringCallback;


publicclassStartEth1ShareRunnableextendsService{

privatestaticfinalString TAG = "StartEth1ShareRunnable";

privateContext mContext;

//以太網共享
privateConnectivityManager mCm;
privateOnStartTetheringCallback mStartTetheringCallback;

@Override
publicIBinder onBind(Intent arg0){
// TODO Auto-generated method stub

returnnull;
}

@Override
publicvoidonCreate(){
super.onCreate();

mCm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
mStartTetheringCallback = newOnStartTetheringCallback();
mHandler.post(StartEth1ShareRunnable);//啟用以太網
}

privateHandler mHandler = newHandler();

privateclassOnStartTetheringCallbackextendsConnectivityManager.OnStartTetheringCallback{
@Override
publicvoidonTetheringStarted(){
Log.d(TAG, "ethernet onTetheringStarted!\n");
}

@Override
publicvoidonTetheringFailed(){
Log.e(TAG, "ethernet onTetheringFailed!\n");
}
}

//以太網共享
privateRunnable StartEth1ShareRunnable = newRunnable() {
@Override
publicvoidrun(){
try{
if(mCm != null)
mCm.startTethering(TETHERING_ETHERNET, true, mStartTetheringCallback, mHandler);//開啟以太網共享
} catch(Exception e) {
Log.e(TAG, "ethernet startTethering error!\n");
e.printStackTrace();
mHandler.postDelayed(StartEth1ShareRunnable, 10000);//延遲10秒后重新執行
}
}
};
}

在packages/apps/Settings/src/com/android/settings/ 添加一個廣播 MyBootReceiver.java 用于接收啟動完成事件，在收到廣播后調用StartEth1ShareRunnable服務

packagecom.android.settings;

importandroid.content.BroadcastReceiver;
importandroid.content.Context;
importandroid.content.Intent;

publicclassMyBootReceiverextendsBroadcastReceiver{

@Override
publicvoidonReceive(Context context, Intent intent){
// TODO Auto-generated method stub
String action = intent.getAction();
if(action.equals(Intent.ACTION_BOOT_COMPLETED))
{
Intent service = newIntent(context, StartEth1ShareRunnable.class);
context.startService(service);
}

}
}

功能驗證

SBC3566主板插入可使用的EC20 4G模塊以及SIM卡，如下圖所示：

?

從SBC3566主板網口接一根網線到另外一塊主板網口上，并給兩個主板供電。

在SBC3566系統查看網口及4G獲取的IP

共享的網口網絡IP：192.168.5.14G網卡IP：10.47.102.124

console:/ # ifconfig
eth0 Link encap:Ethernet HWaddr 02:ed:83:f3:50:c4 Driver rk_gmac-dwmac
inet addr:192.168.5.1 Bcast:192.168.5.255 Mask:255.255.255.0
inet6 addr: fe80::7a78:d959:9bff:28cd/64Scope: Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:133errors:0dropped:0overruns:0frame:0
TX packets:158errors:0dropped:0overruns:0carrier:0
collisions:0txqueuelen:1000
RX bytes:17758TX bytes:37405
Interrupt:38

ppp0 Link encap:Point-to-Point Protocol
inet addr:10.47.102.124 P-t-P:10.64.64.64 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1
RX packets:104errors:0dropped:0overruns:0frame:0
TX packets:111errors:0dropped:0overruns:0carrier:0
collisions:0txqueuelen:3
RX bytes:27734TX bytes:11416

通過ping 百度地址能正常上網

console:/ # ping www.baidu.com
PING www.baidu.com (157.148.69.74) 56(84) bytes ofdata.
64bytes from157.148.69.74: icmp_seq=1ttl=52time=32.8ms
64bytes from157.148.69.74: icmp_seq=2ttl=52time=24.0ms
64bytes from157.148.69.74: icmp_seq=3ttl=52time=24.1ms
64bytes from157.148.69.74: icmp_seq=4ttl=52time=24.4ms
64bytes from157.148.69.74: icmp_seq=5ttl=52time=23.8ms
64bytes from157.148.69.74: icmp_seq=6ttl=52time=24.1ms
64bytes from157.148.69.74: icmp_seq=7ttl=52time=25.4ms
64bytes from157.148.69.74: icmp_seq=8ttl=52time=24.7ms
^C
--- www.baidu.com ping statistics ---
8packets transmitted, 8received, 0% packet loss, time 7012ms
rtt min/avg/max/mdev = 23.808/25.447/32.874/2.852ms

另外一塊主板通過網絡共享獲取到的IP 為192.168.5.X網段

console:/ # ifconfig
eth1 Link encap:Ethernet HWaddr 3a:1d:f7:26:49:0a Driver r8168
inet addr:192.168.5.199 Bcast:192.168.5.255 Mask:255.255.255.0
inet6 addr: fe80::4a59:7a31:cc45:1b53/64Scope: Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:286671errors:0dropped:0overruns:0frame:0
TX packets:586errors:0dropped:0overruns:0carrier:0
collisions:0txqueuelen:1000
RX bytes:27238966TX bytes:64962
Interrupt:169Base address:0x3000

通過測試可以ping通互聯網網址

console:/ # ping www.baidu.com
PING www.baidu.com (157.148.69.74) 56(84) bytes ofdata.
64bytes from157.148.69.74: icmp_seq=1ttl=51time=37.7ms
64bytes from157.148.69.74: icmp_seq=2ttl=51time=28.7ms
64bytes from157.148.69.74: icmp_seq=3ttl=51time=22.9ms
64bytes from157.148.69.74: icmp_seq=4ttl=51time=23.2ms
64bytes from157.148.69.74: icmp_seq=5ttl=51time=23.4ms
64bytes from157.148.69.74: icmp_seq=6ttl=51time=48.0ms
64bytes from157.148.69.74: icmp_seq=7ttl=51time=23.0ms
64bytes from157.148.69.74: icmp_seq=8ttl=51time=24.9ms
64bytes from157.148.69.74: icmp_seq=9ttl=51time=69.8ms
^C
--- www.baidu.com ping statistics ---
9packets transmitted, 9received, 0% packet loss, time 8012ms
rtt min/avg/max/mdev = 22.930/33.577/69.879/15.184ms