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UDPSocket

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See udp-socket for user-level documentation.

Below are notes about the module.

Implementation details

Important notes

  • This accessor is still under development, now it only supports listening to a port.
  • There is a working demo under $PTII/ptolemy/actor/lib/jjs/modules/udpSocket/demo.

Resources for the demo

  • You can forward incoming UDP packets on the specified port of SwarmBox to your local machine (to the specified IP address) using the following JavaScript source code. (udpforward.js) (modified code from https://nodejs.org/api/dgram.html)
var dgram = require("dgram");

var server = dgram.createSocket("udp4");

server.on("error", function (err) {
          console.log("server error:\n" + err.stack);
            server.close();
            });

server.on("message", function (msg, rinfo) {
          console.log("server got: " + msg + " from " +
                  rinfo.address + ":" + rinfo.port + ' length: ' + msg.length);
          client.send(msg, 0, msg.length, 22000, "192.168.1.213");
          });

server.on("listening", function () {
          var address = server.address();
            console.log("server listening " +
                      address.address + ":" + address.port);
            });

server.bind(22000);
[$[Get Code]]

Running an example in Cape Code and Node

  1. Install the Cape Code Host
  2. Run the model:
      $PTII/bin/vergil -capecode $PTII/ptolemy/actor/lib/jjs/modules/udpSocket/test/auto/TestUDPSocketSelf.xml
    [$[Get Code]]
  3. Click on the AccessorCodeGenerator and generate code and run the Composite Accessor. The following output will appear in the code generator:
    // Starting ptolemy.cg.kernel.generic.accessor.AccessorCodeGenerator {.TestUDPSocketSelf.AccessorCodeGenerator} code generation.
    Writing TestUDPSocketSelf.js in file:/Users/cxh/ptII/org/terraswarm/accessor/accessors/web/{$HOSTS_NODE}/ (5241 characters)
    In "/Users/cxh/ptII/org/terraswarm/accessor/accessors/web/{$HOSTS_NODE}", about to execute:

            node
            nodeHostInvoke.js
            -timeout
            15000
            {$HOSTS_NODE}/TestUDPSocketSelf
    Reading accessor at: /Users/cxh/ptII/org/terraswarm/accessor/accessors/web/{$HOSTS_NODE}/TestUDPSocketSelf.js
    Reading accessor at: /Users/cxh/ptII/org/terraswarm/accessor/accessors/web/net/UDPSocketListener.js
    Reading accessor at: /Users/cxh/ptII/org/terraswarm/accessor/accessors/web/test/TestDisplay.js
    Reading accessor at: /Users/cxh/ptII/org/terraswarm/accessor/accessors/web/net/UDPSocketSender.js
    Reading accessor at: /Users/cxh/ptII/org/terraswarm/accessor/accessors/web/test/TrainableTest.js
    Instantiated accessor TestUDPSocketSelf with class {$HOSTS_NODE}/TestUDPSocketSelf
    // Code generation complete.
    a1
    a2
    a3
    a4
    a5
    a6
    a7
    a8
    a9
    a10
    JavaScriptStop: about to call stop().
    nodeHost.js: TestUDPSocketSelf.JavaScriptStop: stop() invoked
    nodeHost.js: stop(): about to call wrapup on TestUDPSocketSelf.UDPSocketListener
    nodeHost.js: stop(): about to call wrapup on JavaScript
    nodeHost.js: stop(): about to call wrapup on TestUDPSocketSelf.TestDisplay
    nodeHost.js: stop(): about to call wrapup on TestUDPSocketSelf.UDPSocketSender
    nodeHost.js: stop(): about to call wrapup on TestUDPSocketSelf.TrainableTest
    TrainableTest.js: wrapup() finished: TestUDPSocketSelf.TestUDPSocketSelf.TrainableTest
    nodeHost.js: stop(): about to call wrapup on JavaScriptStop
    JavaScriptStop.wrapup()
    JavaScriptStop: done calling stop() on container
    nodeHost.js: About to invoke wrapup().
    nodeHost.js: invoking wrapup() for accessor: TestUDPSocketSelf.UDPSocketListener
    nodeHost.js: invoking wrapup() for accessor: JavaScript
    nodeHost.js: invoking wrapup() for accessor: TestUDPSocketSelf.TestDisplay
    nodeHost.js: invoking wrapup() for accessor: TestUDPSocketSelf.UDPSocketSender
    Warning: udpSocket.js: close() failed?  See https://github.com/nodejs/node/issues/7061. Ignored exception was Error: Not running
    Error: Not running
        at Socket._healthCheck (dgram.js:530:11)
        at Socket.close (dgram.js:424:8)
        at exports.Socket.close (/Users/cxh/ptII/org/terraswarm/accessor/accessors/web/{$HOSTS_NODE}/node_modules/udpSocket/udpSocket.js:188:14)
        at Accessor.exports.wrapup (eval at Accessor (/Users/cxh/ptII/org/terraswarm/accessor/accessors/web/{$HOSTS_COMMON}/commonHost.js:444:19), <anonymous>:107:10)
        at Accessor.wrapup (/Users/cxh/ptII/org/terraswarm/accessor/accessors/web/{$HOSTS_COMMON}/commonHost.js:571:23)
        at exitHandler (/Users/cxh/ptII/org/terraswarm/accessor/accessors/web/{$HOSTS_NODE}/nodeHost.js:373:17)
        at emitOne (events.js:96:13)
        at process.emit (events.js:188:7)
        at process.exit (internal/process.js:146:15)
        at Timeout._onTimeout (/Users/cxh/ptII/org/terraswarm/accessor/accessors/web/{$HOSTS_NODE}/nodeHost.js:236:15)
    nodeHost.js: invoking wrapup() for accessor: TestUDPSocketSelf.TrainableTest
    TrainableTest.js: wrapup() finished: TestUDPSocketSelf.TestUDPSocketSelf.TrainableTest
    nodeHost.js: invoking wrapup() for accessor: JavaScriptStop
    JavaScriptStop.wrapup()
    All Done.
    [$[Get Code]]
  4. To run by hand:
    cd $PTI/org/terraswarm/accessor/accessors/web/{$HOSTS_NODE}
    node nodeHostInvoke.js -timeout 15000 {$HOSTS_NODE}/TestUDPSocketSelf
    [$[Get Code]]

Running an example in Node by hand

Below is another way to run the example.

An example is available in the accessors repo at: /accessors/web/net/test/auto/TestUdpSocketSelf.js

The example is a composite accessor that sends and receives strings, which has been generated from the Cape Code model in the Ptolemy II repo at: $PTII/ptolemy/actor/lib/jjs/modules/udpSocket/test/auto/TestUDPSocketSelf.xml

To run in node, open a command window, change directory to /accessors/web/hosts/node and start up the nodeHostShell:

node nodeHostShell.js
[$[Get Code]]

In the shell, instantiate the example accessor:

   var a = instantiate('test', 'net/test/auto/TestUdpSocketSelf');
[$[Get Code]]

Then, initialize the accessor:

   a.initialize();
[$[Get Code]]

You should see the following output:

   undefined                                                                      
   nsh> a1
   a2
   a3
   a4
   a5
   a6
   a7
   a8
   a9
   a10
[$[Get Code]]

See Also

  • UDPSocketListener Accessor
  • UDPSocketSender Accessor
  • Watches, which could use this accessor
  • $PTII/org/terraswarm/accessor/test/auto/{UDPSocketInt.xml.UDPSocketString.xml} - two Cape Code Host tests
  • $PTII/ptolemy/actor/lib/jjs/modules/udpSocket/test/auto/TestUDPSocketSelf.xml - A Cape Code Host test that can generate a CompositeAccessor for the Node Host
    • accessors/web/net/test/TestUdpSocketSelf.js - A Composite Accessor version of the Cape Code Host that can be run by the Node Host
  • Modules - Other Modules
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Page last modified on May 02, 2017, at 12:48 am