socket hang after REPL disconnection

[kevin-tritz]

CircuitPython version

Adafruit CircuitPython 9.0.0-rc.0 on 2024-03-08; W5500-EVB-Pico with rp2040

Code/REPL

import asyncio
import collections
import supervisor
import mqtt
import ntp as my_ntp
from sensor import Sensor

supervisor.runtime.autoreload = False


class Stop:
    def __init__(self):
        self.value = False


async def proc_cmds(cmd_queue, stop):
    while not stop.value:
        while len(cmd_queue):
            cmd = cmd_queue.popleft()
            if cmd in ['stop', 'STOP']:
                stop.value = True
                continue
        await asyncio.sleep(0.01)


async def sensor_data(sensor, data_queue, ntp, stop):
    while not stop.value:
        data_queue.append(f"{sensor.name}:{sensor.get_data()}:{ntp.timestamp()}")
        await asyncio.sleep(0.01)


async def main():
    stop = Stop()

    sensors = []
    sensors.append(Sensor("sensor1"))
    sensors.append(Sensor("sensor2"))
    sensors.append(Sensor("sensor3"))
    data_queue = collections.deque((), 100)
    cmd_queue = collections.deque((), 10)

    client, pool = mqtt.init()
    client.data_queue = data_queue
    client.cmd_queue = cmd_queue
    ntp = my_ntp.init(pool)

    mqtt_tasks = mqtt.create_tasks(client, stop)
    time_task = asyncio.create_task(my_ntp.update(ntp, stop))
    data_tasks = [asyncio.create_task(sensor_data(
        sensor, data_queue, ntp, stop)) for sensor in sensors]
    cmd_task = asyncio.create_task(proc_cmds(cmd_queue, stop))
    await asyncio.gather(time_task, cmd_task, *mqtt_tasks, *data_tasks)

    mqtt.deinit(client)

asyncio.run(main())

Behavior

I have a W550-EVB-PICO publishing a MQTT message to an rasppi5 broker once every second. It plugs away happily for hours/days at a time. However, if I ssh to the rasppi5, open minicom so I can see the pub messages that are printed to the REPL, and then close minicom or just terminate the ssh session, the PICO stops publishing after a few seconds. If I open up minicom again shortly after, it will resume MQTT publishing. If I wait a bit longer (~minute-ish) it won't resume publishing, and if I interrupt with a Ctrl-C, it shows it stuck here: File "/lib/adafruit_wiznet5k/adafruit_wiznet5k.py", line 532, in socket_available. Is there something about connecting/disconnecting from the serial that interferes with socket operations?

Description

No response

Additional information

No response