failsafe for session root blocking

engine/nsmservercontrol.py

@@ -566,14 +566,20 @@ class NsmServerControl(object):
         self._setPause(True)
         ready = False
         while not ready:
-            data, addr = self.sock.recvfrom(1024)
-            msg = _IncomingMessage(data)
+            try:
+                data, addr = self.sock.recvfrom(1024)
+                msg = _IncomingMessage(data)
 
-            if msg.oscpath == "/nsm/gui/session/root":
-                sessionRoot = msg.params[0]
-                ready = True
-            else:
-                self._queue.append(msg)
+                if msg.oscpath == "/nsm/gui/session/root":
+                    sessionRoot = msg.params[0]
+                    ready = True
+                else:
+                    self._queue.append(msg)
+
+            except BlockingIOError: #happens while no data is received. Has nothing to do with blocking or not.
+                continue
+            except socket.timeout:
+                continue
 
         logger.info(f"Session root directory is {sessionRoot}")
         self._setPause(False)