Hi,<div><br></div><div>This is my first Python-list post; I hope it's going to the right place. Here's my problem:</div><div><br></div><div>I've read many tutorials on socket programming, but I can't seem to piece them together for my particular case. I have 3 serial ports, each of which individually connects to a port on a NetCom box, which converts them to TCP/IP ports (see e.g. <a href="http://www.serialgear.com/4--Port-Serial-TCP-IP-NETCOM-411.html">http://www.serialgear.com/4--Port-Serial-TCP-IP-NETCOM-411.html</a>). But I'll just focus on communicating with 1 serial port right now (assume that I have a 1-port NetCom box). So, the flow pattern goes like this -- ascii string from my Python program via the ethernet card to the NetCom box, which feeds the serial port; this serial port is the input/output to a board that controls a motor. So, I can send an ascii string like "MI100\n", which tells that motor to move 100 steps. Currently, I can accomplish this using sockets. But if I instead want to request something from the motor, like it's current position, how do I return this information back to my Python program and still keep the socket alive and listening for say another position request?</div>
<div><br></div><div>FYI, the NetCom box works on DHCP. So, I could use 'arp' or another method to actually find it's IP address, and I can connect to it using say port 2000. At this point, it looks as if I would setup a server socket for the NetCom box, and then create a client socket for the motor controller board to talk to the NetCom box (and e.g. give the current position of the motor, upon my request). But the hard part seems to be how to retrieve that information from the controller board, once it responds. For instance, if I were to just use pySerial, I open up a connection to the serial port, then serial.send(ascii) sends the request, and serial.readline() reads the response. I need to know how to implement this basic functionality with sockets, where the sockets remain alive and listening after each request/response, just as pySerial does.</div>
<div><br></div><div>Any advice, sockets or not, is helpful and appreciated, and I can elaborate further on the problem, if requested. (Again, I hope this was not a misuse of the list in some way; I apologize, if so). Many thanks.</div>
<div><br></div><div>-Ryan</div>