app功能是連接PLC。我在 PLC 上使用 Modbus 服務器，在 Android 應用程式中使用 EasyModbus 客戶端。如果應用程式第一次連接失敗，大約需要 2-3 分鐘才能再次嘗試連接。它在主執行緒上正常運行，但是當我將它移動到單獨的執行緒時，就會出現問題。
我嘗試更改連接超時，但沒有結果。
public void connect() {
Thread thread = new Thread(new Runnable() {
@Override
public void run() {
while(!connected) {
ModbusClient modbusClient = new ModbusClient("192.168.0.1", 502);
modbusClient.setConnectionTimeout(30);
try {
Log.e(TAG, "Try connecting to port: " 502;
modbusClient.Connect();
connected = true;
} catch (Exception e) {
e.printStackTrace();
}
}
}
});
thread.start();
}
日志：
Try connecting to port: 502
W/System: A resource failed to call close.
W/System.err: java.net.ConnectException: failed to connect to /192.168.21.136 (port 1201) from /:: (port 46369): connect failed: ETIMEDOUT (Connection timed out)
W/System.err: at libcore.io.IoBridge.connect(IoBridge.java:142)
W/System.err: at java.net.PlainSocketImpl.socketConnect(PlainSocketImpl.java:142)
W/System.err: at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:390)
W/System.err: at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:230)
W/System.err: at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:212)
W/System.err: at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:436)
at java.net.Socket.connect(Socket.java:621)
W/System.err: at java.net.Socket.connect(Socket.java:570)
W/System.err: at java.net.Socket.<init>(Socket.java:450)
W/System.err: at java.net.Socket.<init>(Socket.java:218)
W/System.err: at de.re.easymodbus.modbusclient.ModbusClient.Connect(ModbusClient.java:88)
W/System.err: at com.example.roseoilproduction.MainActivity$1.run(MainActivity.java:101)
W/System.err: at java.lang.Thread.run(Thread.java:923)
W/System.err: Caused by: android.system.ErrnoException: connect failed: ETIMEDOUT (Connection timed out)
W/System.err: at libcore.io.Linux.connect(Native Method)
W/System.err: at libcore.io.ForwardingOs.connect(ForwardingOs.java:94)
at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:138)
W/System.err: at libcore.io.ForwardingOs.connect(ForwardingOs.java:94)
at libcore.io.IoBridge.connectErrno(IoBridge.java:156)
at libcore.io.IoBridge.connect(IoBridge.java:134)
... 12 more
uj5u.com熱心網友回復：
在記住執行緒是如何作業的之后，我只是添加了處理程式來每 x 秒執行一次執行緒：
Timer timer = new Timer();
timer.schedule(new TimerTask()
{
@Override
public void run()
{
connect();
}
}, 0, 1000);
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