So I have been using the RFXCOM for several years without any problems. I am using ser2net (similar to socat) and the tcpbridge access method of the RFXCOM binding. My OH 3.4.2 is running in Docker.
So today I updated the my Ubuntu host with a simply “sudo apt-get update” + “apt-get upgrade” + reboot. The OH Docker version remained unchanged. After that everything works fine except the RFXCOM binding.
The OH log file comes with this every minute:
2023-04-10 18:43:11.464 [ERROR] [internal.handler.RFXComBridgeHandler] - Error occurred during packet receiving, data: 207463702C31303031206465766963652073657269616C6465762C202F6465762F
org.openhab.binding.rfxcom.internal.exceptions.RFXComUnsupportedValueException: Unsupported value '116' for PacketType
at org.openhab.binding.rfxcom.internal.messages.ByteEnumUtil.fromByte(ByteEnumUtil.java:37) ~[bundleFile:?]
at org.openhab.binding.rfxcom.internal.messages.RFXComMessageFactoryImpl.createMessage(RFXComMessageFactoryImpl.java:125) ~[bundleFile:?]
at org.openhab.binding.rfxcom.internal.handler.RFXComBridgeHandler$MessageListener.packetReceived(RFXComBridgeHandler.java:259) [bundleFile:?]
at org.openhab.binding.rfxcom.internal.connector.RFXComBaseConnector.sendMsgToListeners(RFXComBaseConnector.java:49) [bundleFile:?]
at org.openhab.binding.rfxcom.internal.connector.RFXComStreamReader.run(RFXComStreamReader.java:71) [bundleFile:?]
2023-04-10 18:43:12.169 [ERROR] [internal.handler.RFXComBridgeHandler] - Error occurred: Timeout during packet read
Sometimes I also receive this message:
2023-04-10 18:41:10.853 [ERROR] [internal.handler.RFXComBridgeHandler] - Error occurred during packet receiving, data: 0D0A736572326E657420706F7274
org.openhab.binding.rfxcom.internal.exceptions.RFXComUnsupportedValueException: Unsupported value '10' for PacketType
I could not understand this and tried to to replace ser2net with socat, but that did not work either.
Then I unmounted the RFXtrx433XL device, upgraded to latest firmware #1048 via RFXFlash and tried the hardware using RFXmngr and it works fine. Moving the RFXtrx433XL back to my Ubunto Intel based PC, but still it does not work. I have restarted both ser2net and OH several times.
The UFW firewall in my Ubuntu version 22.04.2 is disabled.
I also added an entry here, because I do not know the root of this problem.
Hope someone can share some light on this. 
EDIT: I added the TRACE option in Karaf console and got this:
2023-04-10 19:10:06.716 [DEBUG] [internal.handler.RFXComBridgeHandler] - Initializing RFXCOM bridge handler
2023-04-10 19:10:06.718 [TRACE] [internal.handler.RFXComBridgeHandler] - Checking RFXCOM transceiver connection, thing status = OFFLINE
2023-04-10 19:10:06.722 [DEBUG] [internal.handler.RFXComBridgeHandler] - Connecting to RFXCOM transceiver
2023-04-10 19:10:06.723 [DEBUG] [nternal.connector.RFXComTcpConnector] - Disconnecting
2023-04-10 19:10:06.723 [DEBUG] [nternal.connector.RFXComTcpConnector] - Closed
2023-04-10 19:10:06.724 [INFO ] [nternal.connector.RFXComTcpConnector] - Connecting to RFXCOM at localhost:1001 over TCP/IP
2023-04-10 19:10:06.723 [DEBUG] [fxcom.internal.handler.RFXComHandler] - Initializing thing rfxcom:rfy:rfxcom1:ThRullegardin4ForanHuset
2023-04-10 19:10:06.725 [DEBUG] [fxcom.internal.handler.RFXComHandler] - initializeBridge OFFLINE for thing rfxcom:rfy:rfxcom1:ThRullegardin4ForanHuset
2023-04-10 19:10:06.724 [DEBUG] [fxcom.internal.handler.RFXComHandler] - Initializing thing rfxcom:rfy:rfxcom1:ThRullegardin2Sovevaerlse
2023-04-10 19:10:06.725 [DEBUG] [fxcom.internal.handler.RFXComHandler] - initializeBridge OFFLINE for thing rfxcom:rfy:rfxcom1:ThRullegardin2Sovevaerlse
2023-04-10 19:10:06.724 [DEBUG] [fxcom.internal.handler.RFXComHandler] - Initializing thing rfxcom:rfy:rfxcom1:ThRullegardin1Mellemgang
2023-04-10 19:10:06.726 [DEBUG] [fxcom.internal.handler.RFXComHandler] - initializeBridge OFFLINE for thing rfxcom:rfy:rfxcom1:ThRullegardin1Mellemgang
2023-04-10 19:10:06.727 [DEBUG] [internal.handler.RFXComBridgeHandler] - Reset controller
2023-04-10 19:10:06.727 [TRACE] [nternal.connector.RFXComTcpConnector] - Send data (len=14): 0D00000000000000000000000000
2023-04-10 19:10:06.727 [DEBUG] [nternal.connector.RFXComStreamReader] - Data listener started
2023-04-10 19:10:06.728 [DEBUG] [fxcom.internal.handler.RFXComHandler] - Initializing thing rfxcom:rfy:rfxcom1:ThRullegardin3Sovevaerlse
2023-04-10 19:10:06.728 [DEBUG] [fxcom.internal.handler.RFXComHandler] - initializeBridge OFFLINE for thing rfxcom:rfy:rfxcom1:ThRullegardin3Sovevaerlse
2023-04-10 19:10:06.728 [TRACE] [nternal.connector.RFXComStreamReader] - Message length is 13 bytes
2023-04-10 19:10:06.729 [TRACE] [nternal.connector.RFXComStreamReader] - Waiting remaining 13 bytes from the message
2023-04-10 19:10:06.730 [TRACE] [nternal.connector.RFXComStreamReader] - Received 13 bytes from the message
2023-04-10 19:10:06.731 [TRACE] [nternal.connector.RFXComStreamReader] - Message length is 32 bytes
2023-04-10 19:10:06.731 [TRACE] [nternal.connector.RFXComStreamReader] - Waiting remaining 32 bytes from the message
2023-04-10 19:10:06.731 [TRACE] [nternal.connector.RFXComStreamReader] - Received 32 bytes from the message
2023-04-10 19:10:06.732 [TRACE] [nternal.connector.RFXComStreamReader] - Message length is 116 bytes
2023-04-10 19:10:06.732 [DEBUG] [fxcom.internal.handler.RFXComHandler] - Initializing thing rfxcom:rfy:rfxcom1:ThRullegardinVindueVest
2023-04-10 19:10:06.732 [DEBUG] [fxcom.internal.handler.RFXComHandler] - initializeBridge OFFLINE for thing rfxcom:rfy:rfxcom1:ThRullegardinVindueVest
2023-04-10 19:10:06.732 [TRACE] [nternal.connector.RFXComStreamReader] - Waiting remaining 116 bytes from the message
2023-04-10 19:10:06.732 [DEBUG] [fxcom.internal.handler.RFXComHandler] - Initializing thing rfxcom:rfy:rfxcom1:ThRullegardinAltanVest
2023-04-10 19:10:06.733 [DEBUG] [fxcom.internal.handler.RFXComHandler] - initializeBridge OFFLINE for thing rfxcom:rfy:rfxcom1:ThRullegardinAltanVest
2023-04-10 19:10:06.733 [TRACE] [nternal.connector.RFXComStreamReader] - Received 48 bytes from the message
2023-04-10 19:10:06.734 [DEBUG] [fxcom.internal.handler.RFXComHandler] - Initializing thing rfxcom:rfy:rfxcom1:ThRullegardinAlleVest
2023-04-10 19:10:06.734 [TRACE] [nternal.connector.RFXComStreamReader] - Waiting remaining 68 bytes from the message
2023-04-10 19:10:06.734 [DEBUG] [fxcom.internal.handler.RFXComHandler] - initializeBridge OFFLINE for thing rfxcom:rfy:rfxcom1:ThRullegardinAlleVest
2023-04-10 19:10:06.735 [DEBUG] [fxcom.internal.handler.RFXComHandler] - Initializing thing rfxcom:rfy:rfxcom1:ThRullegardinAlle
2023-04-10 19:10:06.735 [DEBUG] [fxcom.internal.handler.RFXComHandler] - initializeBridge OFFLINE for thing rfxcom:rfy:rfxcom1:ThRullegardinAlle
2023-04-10 19:10:06.834 [TRACE] [nternal.connector.RFXComStreamReader] - Waiting remaining 68 bytes from the message
2023-04-10 19:10:06.935 [TRACE] [nternal.connector.RFXComStreamReader] - Waiting remaining 68 bytes from the message
2023-04-10 19:10:07.028 [DEBUG] [internal.handler.RFXComBridgeHandler] - Get status of controller
2023-04-10 19:10:07.028 [TRACE] [nternal.connector.RFXComTcpConnector] - Send data (len=14): 0D00000102000000000000000000
2023-04-10 19:10:07.036 [TRACE] [nternal.connector.RFXComStreamReader] - Waiting remaining 68 bytes from the message
2023-04-10 19:10:07.050 [TRACE] [nternal.connector.RFXComStreamReader] - Received 21 bytes from the message
2023-04-10 19:10:07.051 [TRACE] [nternal.connector.RFXComStreamReader] - Waiting remaining 47 bytes from the message
2023-04-10 19:10:07.152 [TRACE] [nternal.connector.RFXComStreamReader] - Waiting remaining 47 bytes from the message
2023-04-10 19:10:07.253 [TRACE] [nternal.connector.RFXComStreamReader] - Waiting remaining 47 bytes from the message
2023-04-10 19:10:07.354 [TRACE] [nternal.connector.RFXComStreamReader] - Waiting remaining 47 bytes from the message
2023-04-10 19:10:07.455 [DEBUG] [nternal.connector.RFXComStreamReader] - Received exception, will report it to listeners
org.openhab.binding.rfxcom.internal.exceptions.RFXComTimeoutException: Timeout during packet read
at org.openhab.binding.rfxcom.internal.connector.RFXComStreamReader.processMessage(RFXComStreamReader.java:97) ~[bundleFile:?]
at org.openhab.binding.rfxcom.internal.connector.RFXComStreamReader.run(RFXComStreamReader.java:70) [bundleFile:?]
2023-04-10 19:10:07.456 [ERROR] [internal.handler.RFXComBridgeHandler] - Error occurred: Timeout during packet read
Seems that it is only receiving a part of the message…