java - Android raising EPERM (Operation not permitted) when attempting to send UDP packet after network connection -

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when responding supplicant_state_changed_action broadcast , attempting send udp packet, exception:

java.net.socketexception: sendto failed: eperm (operation not permitted)    @ libcore.io.iobridge.maybethrowaftersendto(iobridge.java:542)    @ libcore.io.iobridge.sendto(iobridge.java:511)    @ java.net.plaindatagramsocketimpl.send(plaindatagramsocketimpl.java:184)    @ java.net.datagramsocket.send(datagramsocket.java:305)    @ com.mycompany.app.serviceclass.discover(serviceclass.java:355)at com.mycompany.app.serviceclass.access$600(serviceclass.java:39)    @ com.mycompany.app.serviceclass$statemachine.run(serviceclass.java:242)    @ java.lang.thread.run(thread.java:818) caused by: android.system.errnoexception: sendto failed: eperm (operation not permitted)    @ libcore.io.posix.sendtobytes(native method)    @ libcore.io.posix.sendto(posix.java:211)    @ libcore.io.blockguardos.sendto(blockguardos.java:278)    @ libcore.io.iobridge.sendto(iobridge.java:509)    @ java.net.plaindatagramsocketimpl.send(plaindatagramsocketimpl.java:184)     @ java.net.datagramsocket.send(datagramsocket.java:305)     @ com.mycompany.app.serviceclass.discover(serviceclass.java:355)     @ com.mycompany.app.serviceclass.access$600(serviceclass.java:39)     @ com.mycompany.app.serviceclass$statemachine.run(serviceclass.java:242)     @ java.lang.thread.run(thread.java:818)

is thrown android. during debugging or if thread.sleep() call of ~300ms added prior attempting send packet, exception isn't raised. seems issue of simultaneous access socket.send() method after android establishes network connection. debugging program 1 call made send(), i'm confident issue related interaction between os , service.

the offending code similar to:

public class serviceclass extends service {     private static final byte[] msg_bytes = "my string send".getbytes();     private connectionmonitor mconnmonitor;      public void oncreate {         super.oncreate();         // create new thread handle broadcast , register receiver         mconnmonitor = new connectionmonitor();         mconnmonitorthread = new handlerthread("connectionmonitor",                                                process.thread_priority_background)         mconnmonitorthread.start();         looper connmonitorlooper = mconnmonitorthread.getlooper();         handler connmonitorhandler = new handler(connmonitorlooper);         intentfilter intentfilter = new intentfilter();         intentfilter.addaction(wifimanager.supplicant_state_changed_action)         registerreceiver(mconnmonitor, netintentfilter, null, connmonitorhandler);      private void sendpacket() {         datagramsocket sock = new datagramsocket(); // wrapped in try-catch         try {             datagrampacket packet = new datagrampacket(msg_bytes, msg_bytes.length,                     inetaddress.getbyname("239.255.255.250"), 1900);             sock.send(packet);         } catch (ioexception e) {              // exception being raised         }      public class connectionmonitor extends broadcastreceiver {         @override         public void onreceive(context context, intent intent) {             supplicantstate supplicantstate =                     intent.getparcelableextra(wifimanager.extra_new_state);

could network being taking more time initialize after supplicant completed broadcast sent or more related threading within service?


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