when send message to another user by fcm as you say in your implantation
the out put is: Exception:
2021-01-12 12:08:33.409 32155-32303/com.cometchat.pro.android.pushnotification W/AbstractXMPPConnection: Connection closed with error
org.jivesoftware.smack.SmackException: Parser got END_DOCUMENT event. This could happen e.g. if the server closed the connection without sending a closing stream element
at org.jivesoftware.smack.tcp.XMPPTCPConnection$PacketReader.parsePackets(XMPPTCPConnection.java:1148)
at org.jivesoftware.smack.tcp.XMPPTCPConnection$PacketReader.access$200(XMPPTCPConnection.java:937)
at org.jivesoftware.smack.tcp.XMPPTCPConnection$PacketReader$1.run(XMPPTCPConnection.java:952)
at java.lang.Thread.run(Thread.java:919)