Question (bug?): Socket is busy reading

[pmbanugo]

I'm using the current version 6.3.0 of zeromq as at today. I have a push/pull pattern where I push a message so that workers can work on it, and then I pull back a response.

// Push request to workers
  await pusher.send(requestData);

  // Pull response from workers
  const [responseData] = await puller.receive();
  const response = unpack(responseData);

I get the error Error processing request: Error: Socket is busy reading; only one receive operation may be in progress at any time.

I would imagine to get a similar error for write if I'm doing something wrong. But it only happens for read command. Am I doing something wrong or using it the wrong way?

I tried Req/Res but the processing is slow, and that's why I switched to push pull