Fixed bug in NetworkEvents::createZmqContext. Added Python example script for sending network events.

Author: cstawarz

Resources/Python/network_events_console.py

@@ -0,0 +1,28 @@
+from __future__ import print_function, unicode_literals
+
+import zmq
+
+try:
+    raw_input
+except NameError:
+    # Python 3
+    raw_input = input
+
+
+def run(hostname='localhost', port=5556):
+    with zmq.Context() as ctx:
+        with ctx.socket(zmq.REQ) as sock:
+            sock.connect('tcp://%s:%d' % (hostname, port))
+            while True:
+                try:
+                    req = raw_input('> ')
+                    sock.send_string(req)
+                    rep = sock.recv_string()
+                    print(rep)
+                except EOFError:
+                    print()  # Add final newline
+                    break
+
+
+if __name__ == '__main__':
+    run()

Source/Processors/NetworkEvents/NetworkEvents.cpp

@@ -449,7 +449,7 @@ void NetworkEvents::run()
     if (rc != 0)
     {
         // failed to open socket?
-        std::cout << "Failed to open socket." << std::endl;
+        std::cout << "Failed to open socket: " << zmq_strerror(zmq_errno()) << std::endl;
         return;
     }
 
@@ -562,7 +562,7 @@ void NetworkEvents::loadCustomParametersFromXml()
 void NetworkEvents::createZmqContext()
 {
 #ifdef ZEROMQ
-    if (zmqcontext != nullptr)
+    if (zmqcontext == nullptr)
         zmqcontext = zmq_ctx_new(); //<-- this is only available in version 3+
 #endif
 }