Exception in thread NetGear, zmq.error.Again: Resource temporarily unavailable

[sourabCV]

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Describe your Question

In my code, I used Netgear for video transfer in the cloud. On that code, I received a NetGear thread error in the long run.

Terminal log output(Optional)

Exception in thread NetGear:
Traceback (most recent call last):
  File "C:\Users\SchneiderElectric\AppData\Local\Programs\Python\Python311\Lib\threading.py", line 1045, in _bootstrap_inner
    self.run()
  File "C:\Users\SchneiderElectric\AppData\Local\Programs\Python\Python311\Lib\threading.py", line 982, in run   
    self._target(*self._args, **self._kwargs)
  File "C:\DefectScanner\venv3\Lib\site-packages\vidgear\gears\netgear.py", line 972, in __recv_handler
    msg_json = self.__msg_socket.recv_json(
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\DefectScanner\venv3\Lib\site-packages\zmq\sugar\socket.py", line 941, in recv_json
    msg = self.recv(flags)
          ^^^^^^^^^^^^^^^^
  File "zmq\backend\cython\socket.pyx", line 809, in zmq.backend.cython.socket.Socket.recv
  File "zmq\backend\cython\socket.pyx", line 845, in zmq.backend.cython.socket.Socket.recv
  File "zmq\backend\cython\socket.pyx", line 199, in zmq.backend.cython.socket._recv_copy
  File "zmq\backend\cython\socket.pyx", line 194, in zmq.backend.cython.socket._recv_copy
  File "zmq\backend\cython\checkrc.pxd", line 22, in zmq.backend.cython.checkrc._check_rc
zmq.error.Again: Resource temporarily unavailable

Python Code(Optional)

from vidgear.gears import NetGear

options = {"max_retries":2,"request_timeout":5,"flag":1,"copy": False, "track": False}
client = NetGear(receive_mode=True, address="0.0.0.0", port="12345",protocol="tcp",pattern=1,**options,)

frame = client.recv()

VidGear Version

0.3.2

Python version

3.11.6

Operating System version

windows10

Any other Relevant Information?

I dont want to use pattern 2 and how can I solve this error or how can I catch this error in a try, exception block pls suggest

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[sourabCV]

any solution?

[abhiTronix]

I received a NetGear thread error in the long run.

Meaning your connection is unstable.

any solution?

Yes, try removing these flags: "flag":1,"copy": False, "track": False. Specifically flag=1 which enables ZMQ_DONTWAIT.
Also you could use pattern=2 in your script, which is zmq.PUB/zmq.SUB (ZMQ Publish/Subscribe Pattern) with NetGear API. In this pattern, both Server and Client end works independently and messages are published without the knowledge of what or if any subscriber of that knowledge exists. No single publisher overwhelms the subscriber. The messages from both publishers are interleaved.

[abhiTronix]

More knowledge about this error:
ZMQ Python wrappers raise zmq.error.Again if the underlying C API returns EAGAIN. You could follow zmq_recv documentation, which states:

• ZMQ_DONTWAIT: Specifies that the operation should be performed in non-blocking mode. If there are no messages available on the specified socket, the zmq_recv() function shall fail with errno set to EAGAIN.
• EAGAIN: Non-blocking mode was requested and no messages are available at the moment.

Solution: @sourabCV Try removing these flags: "flag":1,"copy": False, "track": False

[abhiTronix]

I'll remove these parameters from docs.