It really depends on the OS you’re going to be talking to. Linux is fine–can’t vouce for mac. Windows takes some extra steps.
Let’s say I want to run an XMLRPC server on my windows laptop (192.168.0.10, port eg 40404) and I want the robot to connect and call a function.
On the robot we’d have something like:
client = rpc_factory("xmlrpc", "http://192.168.0.10:40404")
a = client.myFunction()
Windows firewall will usually reject the incoming http request and so now I’d have to go into the firewall and create a rule for incoming TCP port 40404 to allow the connection coming from the robot.