MQTT connection lost when app is in background for above 1 or 2 minutes (Android)

[letrinhthanhvn]

I've been trying to use react_native_mqtt to handle a feature that required mqtt connection still alive when app in background mode. But after 1 or 2 minute in background, mqtt connection lost and console: {errorCode: 7, errorMessage: 'AMQJS0007E Socket error:undefined.', reconnect: false, uri: 'ws://...:**/mqtt'}. Is this a bug of library or related to Android OS? And if anyone faced this problem before, please explain it. Thanks a lot!
My library information i'm using:
+ "react_native_mqtt": "^1.3.1",
+ "react-native": "^0.63.4",
+ "react": "^16.13.1",