Wait until connection is established

#16

streaming_recording_backend.cpp

@@ -22,9 +22,9 @@
 
 #include "streaming_recording_backend.h"
 
-#include "recording_device.h"
 #include "nesci/producer/nest_multimeter.hpp"
 #include "nesci/producer/spike_detector.hpp"
+#include "recording_device.h"
 
 #include <iostream>
 #include <memory>
@@ -41,8 +41,13 @@ void StreamingRecordingBackend::initialize() {
 }
 
 void StreamingRecordingBackend::prepare() {
-  std::cout << "prepare()" << std::endl;
-  std::cout << "Get the number of nodes" << nest::kernel().node_manager.size() << std::endl;
+  LOG(nest::M_INFO, "StreamingRecordingBackend",
+      "Wait until connection is established...");
+  while (!relay_.IsConnected()) {
+    std::this_thread::yield();
+  }
+  LOG(nest::M_INFO, "StreamingRecordingBackend",
+      "Connection established!");
 }
 
 void StreamingRecordingBackend::cleanup() {