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Strange MQTT exceptions - possible memory corruption?

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评估

难度
4/5
预计耗时
3-5 天
新手友好度
28/100
Issue 类型
缺陷
描述清晰度
需要澄清
活跃度
停滞
技术栈
python
领域
embedded-iot, networking

调研方向

Start by reproducing the reported exception with the provided MQTT receive loop on CircuitPython 10.1.3 or 10.1.4, then trace how adafruit_minimqtt handles PUBLISH packet lengths. No test or source file is named in the issue. Done means the reported packet no longer causes the exception or subsequent instability, with the behavior covered by a reproducible test.

由索引模型根据 Issue 内容生成。

描述

bug espressif
CircuitPython version and board name
Adafruit CircuitPython 10.1.3 on 2026-02-21; Wemos Lolin C3 Mini with ESP32-C3FH4
Code/REPL
import asyncio
import wifi
import socketpool
import ssl
import adafruit_minimqtt.adafruit_minimqtt as MQTT
import usyslog

BROKER      = "192.168.0.1"
MQTT_PORT   = 1883
MQTT_TOPICS = [
    "inverter/total/P_AC",
    "battery/1/relay/set",
    "battery/2/relay/set",
]

sl = usyslog.UDPClient(socketpool.SocketPool(wifi.radio), ip='192.168.0.1', tag='battery')

def log(msg):
    try:
        sl.info(msg)
    except Exception:
        print(msg)

def handle_message(client, topic, message):
    if topic == "inverter/total/P_AC":
        power_ac = float(message)
        log(f"AC power: {power_ac} W")

    elif topic == "battery/1/relay/set":
        if message == "ON":
            log("Relay 1: turning ON")
        else:
            log("Relay 1: turning OFF")

    elif topic == "battery/2/relay/set":
        if message == "ON":
            log("Relay 2: turning ON")
        else:
            log("Relay 2: turning OFF")

async def mqtt_receive_task():
    pool    = socketpool.SocketPool(wifi.radio)
    ssl_ctx = ssl.create_default_context()

    client = MQTT.MQTT(
        broker=BROKER,
        port=MQTT_PORT,
        socket_pool=pool,
        ssl_context=ssl_ctx,
    )
    client.on_message = handle_message

    client.connect()
    client.subscribe([(topic, 0) for topic in MQTT_TOPICS])
    log("MQTT connected and subscribed.")

    while True:
        try:
            client.loop(timeout=1)
        except Exception as e:
            log(f"MQTT error: {e} – reconnecting…")
            try:
                client.reconnect()
            except Exception as re:
                log(f"Reconnect failed: {re}")
        await asyncio.sleep(9)

async def main():
    await mqtt_receive_task()

asyncio.run(main())
Behavior

After some time, 12 to 24 hours:
MQTT error: MMQTTException('Topic length 11830 in PUBLISH packet exceeds remaining length 48 - 2', None);

Description

After this exception the program becomes more and more unstable and just crashes without any error message.
I suspect a memory corruption since I use the mosquitto MQTT server with other project, without any problems, but where?
Tested with Circuitpython 10.1.3 and 10.1.4.
Two different boards tested.

Additional information

No response

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