reconnect restoration

[vladak]

This change restores the behavior of disconnecting on reconnect() if already connected.

[vladak]

Tested on my trusty Adafruit CircuitPython 9.2.4 on 2025-01-29; Adafruit QT Py ESP32S2 with ESP32S2 with:

#!/usr/bin/env python3

import adafruit_minimqtt.adafruit_minimqtt as MQTT
import ssl
import adafruit_logging as logging
import socketpool
import wifi

try:
    from secrets import secrets
except ImportError:
    print(
        "WiFi and Adafruit IO credentials are kept in secrets.py, please add them there!"
    )
    raise


def connect_hook(client, user_data, result, code):
    print(f"Connect: {user_data} {result} {code}")


def message_hook(client, topic, message):
    # print(f"Message: topic='{topic}' message='{message}'")
    print(f"Message: topic='{topic}'")


def main():
    logger = logging.getLogger(__name__)
    logger.setLevel(logging.INFO)

    logger.info("Connecting to wifi")
    wifi.radio.connect(secrets["ssid"], secrets["password"], timeout=10)
    logger.info(f"Connected to {secrets['ssid']}")
    logger.debug(f"IP: {wifi.radio.ipv4_address}")

    pool = socketpool.SocketPool(wifi.radio)  # pylint: disable=no-member

    broker = "172.40.0.3"
    port = 1883

    mqtt_client = MQTT.MQTT(
        broker=broker,
        port=port,
        socket_pool=pool,
        ssl_context=ssl.create_default_context(),
    )

    mqtt_client.enable_logger(logging, log_level=logging.DEBUG)

    mqtt_client.on_connect = connect_hook
    mqtt_client.on_message = message_hook

    mqtt_client.connect()
    mqtt_client.subscribe('devices/foo/#')

    mqtt_client.reconnect()

    while True:
        mqtt_client.loop()

try:
    main()
except Exception as e:
    print(f"Got exception: {e}")

Produces the following output:

code.py output:
3125.951: INFO - Connecting to wifi
3125.954: INFO - Connected to foo
3125.959: DEBUG - Attempting to connect to MQTT broker (attempt #0)
3125.961: DEBUG - Attempting to establish MQTT connection...
3125.968: DEBUG - Sending CONNECT to broker...
3125.971: DEBUG - Fixed Header: bytearray(b'\x10\x13')
3125.973: DEBUG - Variable Header: bytearray(b'\x00\x04MQTT\x04\x02\x00<')
3125.983: DEBUG - Receiving CONNACK packet from broker
3125.987: DEBUG - Got message type: 0x20 pkt: 0x20
Connect: None 0 0
3125.991: DEBUG - Resetting reconnect backoff
3125.993: DEBUG - Sending SUBSCRIBE to broker...
3125.997: DEBUG - Fixed Header: bytearray(b'\x82\x17')
3126.000: DEBUG - Variable Header: b'\x00\x01'
3126.005: DEBUG - SUBSCRIBING to topic devices/foo/# with QoS 0
3126.007: DEBUG - payload: b'\x00\x12devices/foo/#\x00'
3126.055: DEBUG - Got message type: 0x90 pkt: 0x90
3126.059: DEBUG - Attempting to reconnect with MQTT broker
3126.061: DEBUG - Sending DISCONNECT packet to broker
3126.063: DEBUG - Closing socket
3126.070: DEBUG - Attempting to connect to MQTT broker (attempt #0)
3126.072: DEBUG - Attempting to establish MQTT connection...
3126.080: DEBUG - Sending CONNECT to broker...
3126.082: DEBUG - Fixed Header: bytearray(b'\x10\x13')
3126.084: DEBUG - Variable Header: bytearray(b'\x00\x04MQTT\x04\x02\x00<')
3126.090: DEBUG - Receiving CONNACK packet from broker
3126.097: DEBUG - Got message type: 0x20 pkt: 0x20
Connect: None 0 0
3126.101: DEBUG - Resetting reconnect backoff
3126.103: DEBUG - Reconnected with broker
3126.106: DEBUG - Attempting to resubscribe to previously subscribed topics.
3126.108: DEBUG - Sending SUBSCRIBE to broker...
3126.111: DEBUG - Fixed Header: bytearray(b'\x82\x17')
3126.115: DEBUG - Variable Header: b'\x00\x02'
3126.120: DEBUG - SUBSCRIBING to topic devices/foo/# with QoS 0
3126.122: DEBUG - payload: b'\x00\x12devices/foo/#\x00'
3126.165: DEBUG - Got message type: 0x90 pkt: 0x90
3126.168: DEBUG - waiting for messages for 1.0 seconds
3127.171: DEBUG - Loop timed out after 1.0 seconds
3127.173: DEBUG - waiting for messages for 1.0 seconds
3127.234: DEBUG - Got message type: 0x30 pkt: 0x30
3127.238: DEBUG - Receiving PUBLISH 
Topic: devices/foo/qtpy
Msg: bytearray(b'{"lux": 8.2944, "brightness": 0.74, "cpu_temp": 89.5844, "light": 18}')
Message: topic='devices/foo/qtpy'
3128.243: DEBUG - Loop timed out after 1.0 seconds
3128.246: DEBUG - waiting for messages for 1.0 seconds
3129.691: DEBUG - Got message type: 0x30 pkt: 0x30
3129.695: DEBUG - Receiving PUBLISH 
Topic: devices/foo/qtpy
Msg: bytearray(b'{"lux": 8.2944, "brightness": 0.74, "cpu_temp": 67.6544, "light": 18}')
Message: topic='devices/foo/qtpy'
3129.700: DEBUG - Loop timed out after 1.0 seconds
3129.704: DEBUG - waiting for messages for 1.0 seconds
...

[tyeth]

This looks good to me, thanks for the extra tests too.

@brentru thinking about merging this one in, plus secrets (#245) and releasing.
I could pickup the MQTTStateException (#240) too in the same release, or do patch ones then major for the exceptions change.