Port, board and/or hardware

ESP32_GENERIC_C3-20250809-v1.26.0; ESP32 C3 Supermini

MicroPython version

MicroPython v1.26.0 on 2025-08-09; ESP32C3 module with ESP32C3

Reproduction

From the sender, send a too-large message via ESP32 (>250 bytes), followed by more 'correct' messages:

e.send(peer, "a" * 10)
e.send(peer, "a" * 10)
e.send(peer, "a" * 10)
e.send(peer, "a" * 251)
e.send(peer, "a" * 10)
e.send(peer, "a" * 10)
e.send(peer, "a" * 10)

Receive the messages, catching errors:

while True:
    try:
        print(e.recv())
    except Exception as err:
        print(err)

Expected behaviour

The first too-large message should raise an exception. Subsequent 'correct' messages should then continue as normal.

Observed behaviour

The first messages appear as expected - once the long message is received, the exception is printed repeatedly and no further messages are seen:

[b' n\xf1h\x98\x90', b'bbbbbbbbbb']
[b' n\xf1h\x98\x90', b'bbbbbbbbbb']
[b' n\xf1h\x98\x90', b'bbbbbbbbbb']
ValueError: ESPNow.recv(): buffer error
ValueError: ESPNow.recv(): buffer error
ValueError: ESPNow.recv(): buffer error
ValueError: ESPNow.recv(): buffer error
ValueError: ESPNow.recv(): buffer error
<repeats forever>

Additional Information

A workaround for this issue is to deinit on ValueError, i.e.:

try:
    e.recv()
except ValueError:
    e.active(False)
    e.active(True)

Code of Conduct

Yes, I agree