When logged user remove a friend from friends list.
void onLockUser(int userId);
When logged user lock a contact or friend.
void onUnLockUser(int userId);
When logged user unlock a contact or friend.
void onDeleteConversation(int userId);
When logged delete conversation with a contact.
void onError(int code,String error);
When error occured.
MQTTChat FCM listener
Two types of FCM events are provided by the listener: events following an MQTT Chat notification received. Or else an FCM notification message not sent by MQTT Chat but received by FCM service. It can be sent by your server or another library.