Are your looking for hybrid tcp/ip proxies & bind to n3tm/c3po? More some the (snmp) proto-call maybe of help? I know their is an rfc's on the number is ??? I've ported some material look up "overbyte ics sockets" dig around! ________________________________________ From: Koenraad Lelong <lazar...@de-brouwerij.be> Sent: February 4, 2016 3:10 PM To: lazarus@lists.lazarus.freepascal.org Subject: Re: [Lazarus] FreePascal TCPIP data tunnel code sample?
Op 04-02-16 om 17:17 schreef Bo Berglund: > I wonder if someone has built a program that can be used as a "tunnel" > of data from one TCP server to a TCP client on another network? > The program should sit in between in a computer connected to both > networks (Ethernet and WiFi). > If so I would be grateful to share the solutions. > > Reason: > I am trying to develop a client program for controlling a data > collection instrument, which has WiFi connectivity only. > Its connection is implemented as a WiFi Access Point to which you > connect. Then you have access to the data source via TCP port 1001. > The source is actually operating via RS232 internally. > There is a protocol involved for commanding actions and for > transferring data in both directions. > > Now, I would like to be able to connect to this unit from my place of > coding by having a multi-homed device sitting close to the instrument > and connecting to it via the WiFi AP, but at the same time it is also > connected to the office network by Ethernet. > The device should run a program to connect it to the data port > (TCP:1001) of the WiFi AP and start a TCP server on the Ethernet > connection on TCP port 1001. > Then whatever data comes in through the Ethernet port should be sent > via the WiFi connection to the instrument. > All data received from the instrument should be sent out to the > connected client on the Ethernet connection. > So the program I am looking for should not do anything at all with the > data content, except transfer byte-by-byte between the networks. > > And this should be running on a Raspberry Pi2B so it can be easily > deployed in the place the instrument is located. Meanwhile I can sit > in another building and test the actual client code. > > Is there something like this available already? > > Hi, Isn't this just port-forwarding ? Set up the firewall to forward data to the wired NIC to the device's address and port. If you want it secure, you could use stunnel. My 2 cents, Koenraad. -- _______________________________________________ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus -- _______________________________________________ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus