Customer is putting in an AGV system. The AGV systems wants to talk to the gateway through TCP/IP Socket Comms. So I need to create a listener on the gateway that will write the data it received to a tag. I have read through the following posts:
There is this post, that talks thorugh using the pyton socket library. And it does talk through creating a listener.
However, according to this post, which is a much newer post, it is stated that you should not use the python socket library and should be done in Java.
So I have attempted to do just that. However, I am getting an error when attempting to start this through a startup script on the gateway.
Here is the code that I have in the startup script.
def read_tcp():
# Import Needed Librarys
from java.net import Socket,InetAddress
import system as system
# Set the variables needed
ip = '192.168.25.16'
port = 120
try:
# Create the socket
s = Socket(InetAddress.getByName(ip),port)
# Set socket variables
s.setReuseAddress(True)
# Bind the socket
s = s.bind(InetAddress.getByName(ip))
# Setup the listener
while True:
inStream = s.getInputStream()
print "Received %s" % (inStream)
system.tag.writeBlocking(["[NPT_SMCLineTags]AGV/recMessage"], [inStream])
except Exception as e:
print("Error:", e)
system.util.invokeAsynchronous(read_tcp,'listener')
Here is the error that I am getting in the gateway log.
SystemUtilities 09Jul2024 09:22:23 Error running function from system.util.invokeAsynchronous
com.inductiveautomation.ignition.common.script.JythonExecException: Traceback (most recent call last): File "<[NPT_SMCLineTesting_New] Startup Script>", line 12, in read_tcp File "<[NPT_SMCLineTesting_New] Startup Script>", line 12, in read_tcp at java.base/sun.nio.ch.Net.connect0(Native Method) at java.base/sun.nio.ch.Net.connect(Unknown Source) at java.base/sun.nio.ch.Net.connect(Unknown Source) at java.base/sun.nio.ch.NioSocketImpl.connect(Unknown Source) at java.base/java.net.SocksSocketImpl.connect(Unknown Source) at java.base/java.net.Socket.connect(Unknown Source) at java.base/java.net.Socket.connect(Unknown Source) at java.base/java.net.Socket.(Unknown Source) at java.base/java.net.Socket.(Unknown Source) at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Unknown Source) at java.base/java.lang.reflect.Constructor.newInstance(Unknown Source) at org.python.core.PyReflectedConstructor.constructProxy(PyReflectedConstructor.java:213) java.net.ConnectException: java.net.ConnectException: Connection refused: connect
at org.python.core.Py.JavaError(Py.java:545)
at org.python.core.Py.JavaError(Py.java:536)
at org.python.core.PyReflectedConstructor.constructProxy(PyReflectedConstructor.java:223)
at org.python.core.PyReflectedConstructor.__call__(PyReflectedConstructor.java:182)
at org.python.core.PyObject.__call__(PyObject.java:422)
at org.python.core.PyMethod.instancemethod___call__(PyMethod.java:237)
at org.python.core.PyMethod.__call__(PyMethod.java:228)
at org.python.core.PyMethod.__call__(PyMethod.java:223)
at org.python.core.Deriveds.dispatch__init__(Deriveds.java:20)
at org.python.core.PyObjectDerived.dispatch__init__(PyObjectDerived.java:1112)
at org.python.core.PyType.type___call__(PyType.java:2408)
at org.python.core.PyType.__call__(PyType.java:2389)
at org.python.core.PyObject.__call__(PyObject.java:477)
at org.python.core.PyObject.__call__(PyObject.java:481)
at org.python.pycode._pyx4440.read_tcp$1(<[NPT_SMCLineTesting_New] Startup Script>:25)
at org.python.pycode._pyx4440.call_function(<[NPT_SMCLineTesting_New] Startup Script>)
at org.python.core.PyTableCode.call(PyTableCode.java:173)
at org.python.core.PyBaseCode.call(PyBaseCode.java:306)
at org.python.core.PyFunction.function___call__(PyFunction.java:474)
at org.python.core.PyFunction.__call__(PyFunction.java:469)
at org.python.core.PyFunction.__call__(PyFunction.java:464)
at com.inductiveautomation.ignition.common.script.ScriptManager.runFunction(ScriptManager.java:847)
at com.inductiveautomation.ignition.gateway.script.GatewaySystemUtilities.lambda$_invokeAsyncImpl$0(GatewaySystemUtilities.java:152)
at java.base/java.lang.Thread.run(Unknown Source)
Caused by: org.python.core.PyException: java.net.ConnectException: java.net.ConnectException: Connection refused: connect
... 24 common frames omitted
Caused by: java.net.ConnectException: Connection refused: connect
at java.base/sun.nio.ch.Net.connect0(Native Method)
at java.base/sun.nio.ch.Net.connect(Unknown Source)
at java.base/sun.nio.ch.Net.connect(Unknown Source)
at java.base/sun.nio.ch.NioSocketImpl.connect(Unknown Source)
at java.base/java.net.SocksSocketImpl.connect(Unknown Source)
at java.base/java.net.Socket.connect(Unknown Source)
at java.base/java.net.Socket.connect(Unknown Source)
at java.base/java.net.Socket.(Unknown Source)
at java.base/java.net.Socket.(Unknown Source)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Unknown Source)
at java.base/java.lang.reflect.Constructor.newInstance(Unknown Source)
at org.python.core.PyReflectedConstructor.constructProxy(PyReflectedConstructor.java:213)
... 21 common frames omitted
Can anyone provide some feedback on what I have done wrong?
