KC828-Server unable to respond mqtt command until restart

[admin]

if you stop mqtt broker, KC868-Server will always try to connect mqtt broker. but during this time, http webpage also can be open. just mqtt can't established. my testing is : i install home assistant and mqtt broker on KC868-Server, when i turn OFF mqtt broker, i also can use kc868-server ethernet ip login with my web browser.
my KC868-Server firmware is “V1.48”