Release 0.2.0

include/caosdb/file_transmission/download_request_handler.h

@@ -83,7 +83,11 @@ public:
   DownloadRequestHandler(DownloadRequestHandler &&) = delete;
   DownloadRequestHandler &operator=(DownloadRequestHandler &&) = delete;
 
-  void Start() override { OnNext(true); }
+  void Start() override {
+    if (state_ == CallState::NewCall) {
+      OnNext(true);
+    }
+  }
 
   bool OnNext(bool ok) override;