Raise error with positive code in recv_into for espressif #7123
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I saw this comment of someone claiming that miniMQTT fails on ESP32-S2 with a similar error as I fixed for Pico W in PR #7048.
I was able to reproduce it and saw that it throws an error with the error code -11. This is a negative version of
errno.EAGAIN(11) and causes the error not to be ignored by miniMQTT.I've tested the fix on an UnexpectedMaker Feather S2.