Does Python Close Session close open ports in py file?

[hiNI]

Hello, 

I am running a Python script to open a port to a TCP connection.  However, in the second session, when trying to run the scrip again, I get an error that the TCP connection was refused.

In the python script, I open and close the TCP port like this:

def TCP_socket_conn():

    # create TCP socket and UBX reader object

    HOST = "102.104.22.33"

    PORT = 1056

    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

    s.connect((HOST, PORT))

    ubr = UBXReader(s, protfilter=2)

    return s, ubr

s, ubr = TCP_socket_conn()

<<RUN SOME CODE>>

s.close()

It works the first time, but I get the error the second attempt and I have to reset the TCP connection.

Here is a snippet of the LabVIEW Python call:

 Does LabVIEW automatically close the TCP port?

As an aside, when I also do this to talk to a piece of equipment, I also get an error the second go around if I close the pyvisa session.  Here is an example of the python code:

import pyvisa

import time

t = 0.5

rm = pyvisa.ResourceManager()

instrument = rm.open_resource('TCPIP0::05.20.133.05::8856::SOCKET')

def power_level(command):

    instrument.write(command)

# shutdown

rm.close()

 Any guidance is sincerely appreciated.

Thanks!

[hiNI]

Hello,

Could it be a conflict of resources?...as I am opening the instrument's TCPIP port:

instrument = rm.open_resource('TCPIP0::05.20.133.05::8856::SOCKET')

then opening the device port:

s, ubr = TCP_socket_conn()

then in the end, doing a:

s.close()

???

[rolfk]

Not sure about the Python implementation of TCP-IP sockets but in the case of your pyVISA implementation I would definitely try to do a close of the instrument session too, before closing of the resource manager session.

import pyvisa
import time

t = 0.5
rm = pyvisa.ResourceManager()
instrument = rm.open_resource('TCPIP0::05.20.133.05::8856::SOCKET')

def power_level(command):
       
    instrument.write(command)

instrument.close()
# shutdown
rm.close()