Merge pull request #109 from Telecominfraproject/WIFI-13597-fix-kafka-producer-using-poll

fix: modified kafka manager to use poll in producer

Author: i-chvets

src/framework/KafkaManager.cpp

@@ -107,7 +107,7 @@ namespace OpenWifi {
 					NewMessage.partition(0);
 					NewMessage.payload(Msg->Payload());
 					Producer.produce(NewMessage);
-					Producer.flush();
+					Producer.poll((std::chrono::milliseconds) 0);
 				}
 			} catch (const cppkafka::HandleException &E) {
 				poco_warning(Logger_,
@@ -117,6 +117,10 @@ namespace OpenWifi {
 			} catch (...) {
 				poco_error(Logger_, "std::exception");
 			}
+			if (Queue_.size() == 0) {
+				// message queue is empty, flush all previously sent messages
+				Producer.flush();
+			}
 			Note = Queue_.waitDequeueNotification();
 		}
 		poco_information(Logger_, "Stopped...");