subscription handler hangs when Node.get_value() called from within handler about python-opcua HOT 2 CLOSED

To be more precise, "hangs" means "stops doing anything and I have to kill the process", or does it mean "after one seconds it throws exception"? I suppose it is more likely the second option.

I even think that the problem is already in root.get_child() than in node.get_value().
(But it doesn't matter because both ends at BinaryClient.send_request.)
I also think that BinaryClient (or UASocketClient) doesn't parse response to this request until it is completely finished with previous response. But the previous response is not finished because the callback is waiting for get_child/get_value...

What to do with this?

My idea is that _receive() will put responses to some queue and that there will be the second thread getting items from queue and calling callbacks. This might solve the problem (and perhaps bring new problems).

from python-opcua.

This is behaviour by design. Added info in code and example. bc7fa41

from python-opcua.