为Android创建UDP网络的最佳方式
我最近提出了一个关于Android上的线程问题（Google Daydream特定版本）的问题，该问题并未按预期执行。我正在使用线程进行通信以在嵌入式系统之间传输信息，并且一旦通信失败（即嵌入式系统关闭，或任何其他“无法传输/接收”原因）线程将中止并尝试重新连接到嵌入式系统，直到再次建立连接。
这在Windows上的Unity（5.6）中完美运行，但是一旦移植到Android，线程似乎只是在网络出现故障时挂起并且不会确认该线程已经死亡。 Update（）函数继续循环，但直到我离开场景线程死亡并且代码继续按预期执行（see my other post here）。
我现在正在尝试一个新的想法，我假设它不是线程代码有问题，或者Android无法处理线程（因为我没有我没有任何迹象表明我在Android上做的事情可以在Android上完成，但可能是Android上的网络处理或我的UDP代码。
我已经获得了下面的UDP代码，我想知道是否有人看到任何立即出现错误的内容：
using UnityEngine;
using System;
using System.Net;
using System.Net.Sockets;
public class UDPConn : MonoBehaviour {
Socket sock;
IPEndPoint destEnd;
IPEndPoint endPoint;
EndPoint sender;
// Bool for connection status
public bool socketReady = false;
// Receive timeout (ms).
int rxTimeout = 1000;
byte[] msg;
// Try to initiate connection.
public bool setupSocket(int conPort)
{
try
{
String hostName = "";
var host = Dns.GetHostEntry(Dns.GetHostName());
foreach (var ip in host.AddressList)
{
if (ip.AddressFamily == AddressFamily.InterNetwork)
{
hostName = ip.ToString();
}
}
System.Net.IPAddress ipaddress = System.Net.IPAddress.Parse(hostName);
endPoint = new IPEndPoint(ipaddress, conPort);
System.Net.IPAddress remoteIP = System.Net.IPAddress.Parse("192.168.20.2");
destEnd = new IPEndPoint(remoteIP, conPort);
sender = (EndPoint)destEnd;
sock = new Socket(endPoint.Address.AddressFamily, SocketType.Dgram, ProtocolType.Udp);
sock.Bind(endPoint);
sock.ReceiveTimeout = rxTimeout;
// Send message to 'wake' other side.
sock.SendTo(System.Text.Encoding.ASCII.GetBytes("Connect"), sender);
// Attempt to read from the socket. This will timeout if the other side isn't active.
string readData = readSocket();
if (readData != null) {
socketReady = true;
return true;
}
else
{
socketReady = false;
return false;
}
}
catch (Exception e)
{
Debug.Log("Socket error: " + e);
return false;
}
}
// Send message to server.
public void writeSocket(string theLine)
{
if (!socketReady)
{
return;
}
sock.SendTo(System.Text.Encoding.ASCII.GetBytes(theLine), sender);
}
// Read message from server.
public string readSocket()
{
try
{
msg = new Byte[256];
sock.ReceiveFrom(msg, ref sender);
String returnData = System.Text.Encoding.ASCII.GetString(msg);
return returnData;
}
catch (Exception e)
{
Debug.Log("Socket error: " + e);
return null;
}
}
// Disconnect from the socket.
public void closeSocket()
{
if (!socketReady)
{
return;
}
Debug.Log("UDPConn:closeSocket");
sock.Close();
socketReady = false;
}
}
除了我的代码之外，我还保存了Logcat（请参阅文章末尾），我将网络与Android手机断开连接（通过从屏幕向下滑动，禁用WiFi）。我在UDP代码之外的另一个想法是，我可能需要从Android捕获某种网络错误并更好地处理它。 Logcat中的第一项是我在Unity中发送的最后一条Debug.Log消息，第一条cnss-daemon消息是我断开网络连接的点。那里有什么可以帮助我找到问题吗？
非常感谢您的帮助。对不起，很长的帖子。
06-30 14:07:56.150 19762 19966 I Unity : **Inside Thread Run()
06-30 14:07:56.150 19762 19966 I Unity : Stacktrace is not supported on this platform.
06-30 14:07:56.150 19762 19966 I Unity : (Filename: ./artifacts/generated/common/runtime/DebugBindings.gen.cpp Line: 51)
06-30 14:07:56.150 19762 19966 I Unity :
06-30 14:07:56.149 651 651 W cnss-daemon: type=1400 audit(0.0:153): avc: granted { net_admin } for capability=12 scontext=u:r:cnss-daemon:s0 tcontext=u:r:cnss-daemon:s0 tclass=capability
06-30 14:07:56.149 651 651 W cnss-daemon: type=1400 audit(0.0:154): avc: granted { net_admin } for capability=12 scontext=u:r:cnss-daemon:s0 tcontext=u:r:cnss-daemon:s0 tclass=capability
06-30 14:07:56.149 651 651 W cnss-daemon: type=1400 audit(0.0:155): avc: granted { net_admin } for capability=12 scontext=u:r:cnss-daemon:s0 tcontext=u:r:cnss-daemon:s0 tclass=capability
06-30 14:07:56.149 651 651 W cnss-daemon: type=1400 audit(0.0:156): avc: granted { net_admin } for capability=12 scontext=u:r:cnss-daemon:s0 tcontext=u:r:cnss-daemon:s0 tclass=capability
06-30 14:07:56.149 651 651 W cnss-daemon: type=1400 audit(0.0:157): avc: granted { net_admin } for capability=12 scontext=u:r:cnss-daemon:s0 tcontext=u:r:cnss-daemon:s0 tclass=capability
06-30 14:07:56.149 651 651 W cnss-daemon: type=1400 audit(0.0:158): avc: granted { net_admin } for capability=12 scontext=u:r:cnss-daemon:s0 tcontext=u:r:cnss-daemon:s0 tclass=capability
06-30 14:07:56.153 1487 1487 I wpa_supplicant: wlan0: CTRL-EVENT-DISCONNECTED bssid=de:14:5c:9c:33:94 reason=3 locally_generated=1
06-30 14:07:56.154 1487 1487 W wpa_supplicant: nl80211: Was expecting local disconnect but got another disconnect event first
06-30 14:07:56.160 1110 1455 D WifiStateMachine: WifiStateMachine: Leaving Connected state
06-30 14:07:56.164 1110 1456 D DhcpClient: doQuit
06-30 14:07:56.170 1110 1456 D ApfFilter: (wlan0): shutting down
06-30 14:07:56.171 1110 1455 D WifiNative-HAL: stopRssiMonitoring, cmdId 0
06-30 14:07:56.174 1110 19709 D DhcpClient: Receive thread stopped
06-30 14:07:56.177 1110 1459 D ConnectivityService: NetworkAgentInfo [WIFI () - 110] EVENT_NETWORK_INFO_CHANGED, going from CONNECTED to DISCONNECTED
06-30 14:07:56.177 1110 1459 D ConnectivityService: NetworkAgentInfo [WIFI () - 110] got DISCONNECTED, was satisfying 8
06-30 14:07:56.177 1930 1930 I WCNSS_FILTER: ibs_msm_serial_clock_vote: vote UART CLK OFF using UART driver's ioctl()
06-30 14:07:56.189 639 1171 D CommandListener: Setting iface cfg
06-30 14:07:56.200 1930 1930 I WCNSS_FILTER: ibs_msm_serial_clock_vote: vote UART CLK ON using UART driver's ioctl()
06-30 14:07:56.206 1110 19707 D DhcpClient: onQuitting
06-30 14:07:56.223 1682 1752 W QCNEJ : |CORE| network lost: 110
06-30 14:07:56.224 1682 1752 W QCNEJ : |CORE| onLost: unbind the process to WIFI
06-30 14:07:56.229 1487 1487 I wpa_supplicant: wlan0: CTRL-EVENT-REGDOM-CHANGE init=USER type=COUNTRY alpha2=US
06-30 14:07:56.238 639 1171 D CommandListener: Clearing all IP addresses on wlan0
06-30 14:07:56.244 1110 1455 D WifiCountryCode: Succeeded to set country code to: US
06-30 14:07:56.244 1110 1455 D WifiStateMachine: Start Disconnecting Watchdog 11
06-30 14:07:56.245 1110 1455 D WifiNative-HAL: stopRssiMonitoring, cmdId 0
06-30 14:07:56.256 1110 1455 I WifiConnectivityManager: scheduleWatchdogTimer
06-30 14:07:56.277 2037 2453 W Settings: Setting airplane_mode_on has moved from android.provider.Settings.System to android.provider.Settings.Global, returning read-only value.
06-30 14:07:56.282 1110 1455 I WifiConnectivityManager: Set WiFi disabled
06-30 14:07:56.283 1110 1455 D WifiNetworkAgent: NetworkAgent: NetworkAgent channel lost
06-30 14:07:56.297 639 1171 V IdletimerController: runCmd(/system/bin/ip6tables -w -t raw -D idletimer_raw_PREROUTING -i wlan0 -j IDLETIMER --timeout 15 --label 1 --send_nl_msg 1) res_ipv4=0, res_ipv6=0
06-30 14:07:56.310 2037 2453 W Settings: Setting airplane_mode_on has moved from android.provider.Settings.System to android.provider.Settings.Global, returning read-only value.
06-30 14:07:56.330 639 1171 V IdletimerController: runCmd(/system/bin/ip6tables -w -t mangle -D idletimer_mangle_POSTROUTING -o wlan0 -j IDLETIMER --timeout 15 --label 1 --send_nl_msg 1) res_ipv4=0, res_ipv6=0
06-30 14:07:56.332 1110 1459 D ConnectivityService: Sending DISCONNECTED broadcast for type 1 NetworkAgentInfo [WIFI () - 110] isDefaultNetwork=true
06-30 14:07:56.344 18824 18824 D MusicLifecycle: com.google.android.music.net.NetworkConnectivityMonitor$NetworkChangedReceiver generated event: Broadcast received with context com.google.android.music.ui.PhoneMusicApplication@e91968c and intent Intent { act=android.net.conn.CONNECTIVITY_CHANGE flg=0x4000010 (has extras) }
06-30 14:07:56.349 2393 18279 W MdnsClient_Cast: Multicast lock held. Releasing. Subtypes:"233637DE"
06-30 14:07:56.359 18824 18824 I NetworkConnectivity: Network state changed: null
06-30 14:07:56.372 2393 18279 W MdnsClient: unicast receiver thread is already dead.
06-30 14:07:56.384 18824 18824 I NetworkPolicyMonitor: Download-ability status changed to (false) unmetered wifi/eth: false mobileOrMetered: false
06-30 14:07:56.389 18824 18824 I NetworkPolicyMonitor: Stream-ability status changed to (false) unmetered wifi/eth: false mobileOrMetered: false
06-30 14:07:56.408 2393 18279 I DeviceScanner: [MDNS] notifyDevicesOffline: []
06-30 14:07:56.422 2393 18279 E Publisher: ProcessDatabaseInternal start
06-30 14:07:56.424 2393 18279 I CastMediaRouteProvider: onDevicesPublished with 0 devices
06-30 14:07:56.438 2393 18279 I CastMediaRouteProvider: Published 0 routes
06-30 14:07:56.447 1930 1930 I WCNSS_FILTER: ibs_msm_serial_clock_vote: vote UART CLK OFF using UART driver's ioctl()
06-30 14:07:56.452 1930 1930 I WCNSS_FILTER: ibs_msm_serial_clock_vote: vote UART CLK ON using UART driver's ioctl()
06-30 14:07:56.462 639 1171 E Netd : netlink response contains error (No such file or directory)
06-30 14:07:56.464 1110 1459 D NetworkNotificationManager: clearing notification tag=ConnectivityNotification:110 event=NO_INTERNET
06-30 14:07:56.490 2393 14149 W Herrevad: [660] rwh.b: Invalid mccmnc
06-30 14:07:56.495 2393 14149 W Herrevad: [660] rwh.b: Invalid mccmnc
06-30 14:07:56.525 18824 18935 W NetworkBandwidthMonitor: Unsuccessful attempt to get a Network Quality Client prediction (quality==null)
06-30 14:07:56.552 1930 1930 I WCNSS_FILTER: ibs_msm_serial_clock_vote: vote UART CLK OFF using UART driver's ioctl()
06-30 14:07:56.557 1930 1930 I WCNSS_FILTER: ibs_msm_serial_clock_vote: vote UART CLK ON using UART driver's ioctl()
06-30 14:07:56.673 1930 1930 I WCNSS_FILTER: ibs_msm_serial_clock_vote: vote UART CLK OFF using UART driver's ioctl()
06-30 14:07:56.677 1930 1930 I WCNSS_FILTER: ibs_msm_serial_clock_vote: vote UART CLK ON using UART driver's ioctl()
06-30 14:07:56.732 1930 1930 I WCNSS_FILTER: ibs_msm_serial_clock_vote: vote UART CLK OFF using UART driver's ioctl()
06-30 14:07:56.737 1930 1930 I WCNSS_FILTER: ibs_msm_serial_clock_vote: vote UART CLK ON using UART driver's ioctl()
06-30 14:07:59.732 1930 1930 I WCNSS_FILTER: ibs_msm_serial_clock_vote: vote UART CLK OFF using UART driver's ioctl()
06-30 14:07:59.752 1930 1930 I WCNSS_FILTER: ibs_msm_serial_clock_vote: vote UART CLK ON using UART driver's ioctl()
06-30 14:08:00.872 1930 1930 I WCNSS_FILTER: ibs_msm_serial_clock_vote: vote UART CLK OFF using UART driver's ioctl()
06-30 14:08:00.877 1930 1930 I WCNSS_FILTER: ibs_msm_serial_clock_vote: vote UART CLK ON using UART driver's ioctl()
06-30 14:08:02.680 2164 2181 W GvrApi : GvrApi.shutdown() should be called to ensure resource cleanup
06-30 14:08:04.847 1930 1930 I WCNSS_FILTER: ibs_msm_serial_clock_vote: vote UART CLK OFF using UART driver's ioctl()
06-30 14:08:04.852 1930 1930 I WCNSS_FILTER: ibs_msm_serial_clock_vote: vote UART CLK ON using UART driver's ioctl()
06-30 14:08:21.718 1110 1670 E : E/int izat_xtra::XtraDataRequest::doDownloadXtraData(const string &, string &):177][XTRA2] DNS resolution on xtrapath3.izatcloud.net failed.
06-30 14:08:24.766 2037 19816 W ctxmgr : [NetworkStateProducer]No state change for network connection context
06-30 14:08:26.012 1930 1930 I WCNSS_FILTER: ibs_msm_serial_clock_vote: vote UART CLK OFF using UART driver's ioctl()
06-30 14:08:26.017 1930 1930 I WCNSS_FILTER: ibs_msm_serial_clock_vote: vote UART CLK ON using UART driver's ioctl()