<![CDATA[TCP Connection Open/Close]]>Hello All,

Noobie here and I have a question about Modbus4J.

I was using WireShark packet capture to look at the MODBUS requests being sent by Modbus4J. One of the things I noticed is that Modbus4J opens/closes a TCP connection for each MODBUS request.

Is there a way to set the Modbus4J driver to open a TCP connection once, send all the MODBUS requests, and when all the responses have been received or a timeout occurs close the TCP connection?

OR...Just leave the TCP connection open until a timeout occurs or the Modbus4J driver is shutdown.

Thanks...John

]]>https://forum.mango-os.com/topic/496/tcp-connection-open-closeRSS for NodeTue, 15 Sep 2026 06:32:38 GMTThu, 26 Aug 2010 13:53:34 GMT60<![CDATA[Reply to TCP Connection Open/Close on Fri, 22 Jun 2012 15:20:31 GMT]]>Buenos dias,
soy nuevo en el foro
Estoy probando m2m para conectar unos dispositivos con protocolo modbus
Mi intención es conectar a través de un modem gprs. El sim cuando se conecta arroja una ip
Pero siempre el mango me tira este error

'aaa': com.serotonin.modbus4j.exception.ModbusTransportException: java.net.SocketTimeoutException: connect timed out

alguien puede ayudarme?

]]>https://forum.mango-os.com/post/6479https://forum.mango-os.com/post/6479Fri, 22 Jun 2012 15:20:31 GMT<![CDATA[Reply to TCP Connection Open/Close on Thu, 26 Aug 2010 23:09:14 GMT]]>Will do...Thanks!!!

]]>https://forum.mango-os.com/post/4205https://forum.mango-os.com/post/4205Thu, 26 Aug 2010 23:09:14 GMT<![CDATA[Reply to TCP Connection Open/Close on Thu, 26 Aug 2010 21:40:25 GMT]]>Use "TCP with keepalive"

]]>https://forum.mango-os.com/post/4199https://forum.mango-os.com/post/4199Thu, 26 Aug 2010 21:40:25 GMT