fix flaky zmq test that randomly fails on recv #34594

1. 
   Hijanhv commented at 3:02 pm on February 15, 2026: none

   This test kept failing on me randomly turns out recv_multipart() sometimes hits a timing issue where the message isn’t ready yet and throws zmq.error.Again.

   Switched to using wait_until_helper_internal() which is what other tests do for this kind of thing. Uses DONTWAIT and retries properly instead of just hoping the message is there.

   Should stop the random CI failures.Fixes https://github.com/bitcoin/bitcoin/issues/34189

2. test: fix intermittent failure in interface_zmq.py

   Use wait_until_helper_internal() to handle zmq.error.Again exceptions
   instead of custom retry logic, following test framework best practices.
   
   Fixes intermittent failures where ZMQ messages are not immediately
   available when recv_multipart() is called.

   fb4f3ceba2
3. 
   DrahtBot commented at 3:02 pm on February 15, 2026: contributor

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4. 
   fanquake commented at 11:01 am on February 16, 2026: member

   (#34508, #34574, #34557)
5. fanquake closed this on Feb 16, 2026

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Hijanhv DrahtBot fanquake