[Bug]: Once a connection is established using modbus tcp, it cannot be reconnected once disconnected

[StrawberryBlue]

What happened?

Once a connection is established using modbus tcp, it cannot be reconnected once disconnected.Or where is the reconnect demo, am I using it the wrong way?

Version

v0.10.0

Programming Languages

• plc4j
• plc4go
• plc4c
• plc4net

Protocols

• AB-Ethernet
• ADS /AMS
• BACnet/IP
• CANopen
• DeltaV
• DF1
• EtherNet/IP
• Firmata
• KNXnet/IP
• Modbus
• OPC-UA
• S7

[Christofer Dutz]

Sorry for the late response ... in order to tell you if you're using it wrong, I guess you'd have to show us how you're using it.
In general it's strange, as Modbus is stateless and the concept of a "connection" is unknown to the protocol. Perhaps it's a problem with the TCP socket re-usage on your device (My KNX for example has a timeout of 5 minutes after disconnecting)

[Christofer Dutz]

So ... for the sake of being right here, I wrote this little program, and it worked as it should ... So I guess you were doing it wrong. But at least you can use this example for knowing how it was supposed to be used (However I wouldn't reccomend this pattern in general ... wir modbus it's ok, but with other drivers such as ADS, this approach would be very imperformant).

    public static void main(String[] args) throws Exception {
        try (PlcConnection plcConnection = PlcDriverManager.getDefault().getConnectionManager().getConnection("modbus-tcp://127.0.0.1")) {
            PlcReadRequest readRequest = plcConnection.readRequestBuilder().addTagAddress("Bool", "holding-register:1000:BOOL").build();
            PlcReadResponse readResponse = readRequest.execute().get();
        }
        try (PlcConnection plcConnection = PlcDriverManager.getDefault().getConnectionManager().getConnection("modbus-tcp://127.0.0.1")) {
            PlcReadRequest readRequest = plcConnection.readRequestBuilder().addTagAddress("Bool", "holding-register:1000:BOOL").build();
            PlcReadResponse readResponse = readRequest.execute().get();
        }
    }