esp8266 lost connection every 30 min

[BruceAKABear]

I have meet one strange problem, esp8266 call connected() methd will return false every 30 min actually the hartbeat is still working, in my logic when connected() return I will reboot whole system. why connected() will return false?

`
hearbeat:

2023-07-05T10:45:47+08:00 [MQTT] 13388860@10.5.171.61:54257 msg: mqtt_packet_received, packet: PINGREQ(Q0, R0, D0)
2023-07-05T10:45:47+08:00 [MQTT] 13388860@10.5.171.61:54257 msg: mqtt_packet_sent, packet: PINGRESP(Q0, R0, D0)

my logic in connect:

2023-07-05T10:45:57+08:00 [MQTT] 13388860@10.5.171.61:53948 msg: mqtt_packet_received, packet: CONNECT(Q0, R0, D0),ClientId=13388860, ProtoName=MQTT, ProtoVsn=4, CleanStart=true,

`

my logic in loop:

`

void loop() {
if (WiFi.status() != WL_CONNECTED) {
connectWifi();
} else {
if (!mqttClient.connected()) {
connectMqtt();
}
}
mqttClient.loop();
}
`

[superbool]

Check your wifi is stable.