error when re-connecting to server

[iamthebull]

I have a simple program that uses asyncua.sync.Client. The program simply connects to the server, disconnects, then re-connects. When attempting the second connect (or re-connect) I get an error.

The code:

import sys
from time import sleep
from asyncua.sync import Client
import logging

logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__file__)

# end point
url = 'opc.tcp://10.0.1.56:55105'

class Handler():
	def datachange_notification(self, node, val, data):
		logger.info('value is:', val)

try:
	client = Client(url)

	logger.info('user connect')
	client.connect()

	sleep(1)

	logger.info('user disconnect')
	client.disconnect()

	sleep(1)

	logger.info('user connect')
	client.connect()

except Exception as err:
	logger.exception(err)

finally:
	client.disconnect()

The output:

$  cd /home/david/python/opcua ; /usr/bin/env /home/david/python/opcua/.venv/bin/python3 /home/david/.vscode/extensions/ms-python.debugpy-2024.10.0-linux-x64/bundled/libs/debugpy/adapter/../../debugpy/launcher 55907 -- /home/david/python/opcua/main.py 
INFO:/home/david/python/opcua/main.py:user connect
INFO:asyncua.client.client:connect
INFO:asyncua.client.ua_client.UaClient:opening connection
INFO:asyncua.uaprotocol:updating client limits to: TransportLimits(max_recv_buffer=65536, max_send_buffer=65536, max_chunk_count=640, max_message_size=41943040)
INFO:asyncua.client.ua_client.UASocketProtocol:open_secure_channel
INFO:asyncua.client.ua_client.UaClient:create_session
INFO:asyncua.client.client:find_endpoint [EndpointDescription(EndpointUrl='opc.tcp://SNetV16:55105', Server=ApplicationDescription(ApplicationUri='urn:Siemens.Automation.SimaticNET.S7OPT:(B1707412-DBE3-456B-98F1-40029ACA9F7E)', ProductUri='Siemens/SimaticNet/OpcUaServer/S7OPT', ApplicationName=LocalizedText(Locale='en', Text='OPC.SimaticNET.S7OPT'), ApplicationType_=<ApplicationType.Server: 0>, GatewayServerUri=None, DiscoveryProfileUri=None, DiscoveryUrls=['opc.tcp://SNetV16:55105']), ServerCertificate=b'0\x82\x04T0\x82\x03<\xa0\x03\x02\x01\x02\x02\t\x00\x80X\x0c\xd3\xfd\x19\xbf\x0b0\r\x06\t*\x86H\x86\xf7\r\x01\x01\x0b\x05\x00081\x1d0\x1b\x06\x03U\x04\x03\x0c\x14OPC.SimaticNET.S7OPT1\x170\x15\x06\n\t\x92&\x89\x93\xf2,d\x01\x19\x16\x07SNetV160\x1e\x17\r210116154629Z\x17\r410116154629Z081\x1d0\x1b\x06\x03U\x04\x03\x0c\x14OPC.SimaticNET.S7OPT1\x170\x15\x06\n\t\x92&\x89\x93\xf2,d\x01\x19\x16\x07SNetV160\x82\x01"0\r\x06\t*\x86H\x86\xf7\r\x01\x01\x01\x05\x00\x03\x82\x01\x0f\x000\x82\x01\n\x02\x82\x01\x01\x00\xbe\xb4^\xd9\xb5\xd8\xde|\x10\xe9\xc6\xec\x9e)*\xdd\x00io\xd8\x84>h\x1c\x12\xd9\x9d\xdf\x94\x89\x13\xb2C\x93\x1dW\xdcq/\x97@5\xd5$\x0f\xcf}\xfd\xd7#\xdfY\x0e\x04\\\x12\xba?==\xa9\xddJ\xa5jd3\x11L\xc8\xbfN\xc8"+Ti\x91\xbeA\xd4\xba\xbf\xcc[\xcf\x82\x8d$Y\x88)\xb7\xd8\xf8\xf7b\xa31\x16\xf4x\x92\xfcJ\xc2C\xf3\xd4\xc1;\xd1\xc8\xbd;vr)t\x868\x8a\xe3\xb34a\xb3)\x1d\xdf\tf\x8dx\x8c\xfa\xedm\xf3\xda\xae`\xfa\x80{\xcef6\xe2o+\xab\x11\xb1!\xeaB@\x03HD\xa9\x9ap\xc8\xec\xd9\xb1\xe6=\x84\x8a\x10\x868p\x18\x956\xed\xf54\xde\xfd\x18\x9b\xb9\xd7\xac\xba\xcb\xf3i\xf1fuC\xc90\x9f\xad\x7fq\xe7VI\xb2zv\x18Z\xd4\xc1<3f\x8c\x92\xde\xe3\xd0\x9e\xd8\x1c\x8f\x95\xb0\xea\xcaT\x83F\xf6\x9ej\xc7"\xe8I\x06P\x02Z?\x18\xa3N\xc7\xc6,\xb9\xac5r\'K\x02\x03\x01\x00\x01\xa3\x82\x01_0\x82\x01[0\x0c\x06\x03U\x1d\x13\x01\x01\xff\x04\x020\x000\x0e\x06\x03U\x1d\x0f\x01\x01\xff\x04\x04\x03\x02\x02\xf40 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\xf4h\x1d\x98R\xc1I\xfa\xa1\xdaG\xef^W\xe2\xa46{s\xef\xa8\xa7\x97\x1a\r', SecurityMode=<MessageSecurityMode.None_: 1>, SecurityPolicyUri='http://opcfoundation.org/UA/SecurityPolicy#None', UserIdentityTokens=[UserTokenPolicy(PolicyId='Anonymous', TokenType=<UserTokenType.Anonymous: 0>, IssuedTokenType=None, IssuerEndpointUrl=None, SecurityPolicyUri=None), UserTokenPolicy(PolicyId='UserName', TokenType=<UserTokenType.UserName: 1>, IssuedTokenType=None, IssuerEndpointUrl=None, SecurityPolicyUri='http://opcfoundation.org/UA/SecurityPolicy#Basic256')], TransportProfileUri='http://opcfoundation.org/UA-Profile/Transport/uatcp-uasc-uabinary', SecurityLevel=0), EndpointDescription(EndpointUrl='opc.tcp://SNetV16:55105', Server=ApplicationDescription(ApplicationUri='urn:Siemens.Automation.SimaticNET.S7OPT:(B1707412-DBE3-456B-98F1-40029ACA9F7E)', ProductUri='Siemens/SimaticNet/OpcUaServer/S7OPT', ApplicationName=LocalizedText(Locale='en', Text='OPC.SimaticNET.S7OPT'), ApplicationType_=<ApplicationType.Server: 0>, GatewayServerUri=None, DiscoveryProfileUri=None, DiscoveryUrls=['opc.tcp://SNetV16:55105']), ServerCertificate=b'0\x82\x04T0\x82\x03<\xa0\x03\x02\x01\x02\x02\t\x00\x80X\x0c\xd3\xfd\x19\xbf\x0b0\r\x06\t*\x86H\x86\xf7\r\x01\x01\x0b\x05\x00081\x1d0\x1b\x06\x03U\x04\x03\x0c\x14OPC.SimaticNET.S7OPT1\x170\x15\x06\n\t\x92&\x89\x93\xf2,d\x01\x19\x16\x07SNetV160\x1e\x17\r210116154629Z\x17\r410116154629Z081\x1d0\x1b\x06\x03U\x04\x03\x0c\x14OPC.SimaticNET.S7OPT1\x170\x15\x06\n\t\x92&\x89\x93\xf2,d\x01\x19\x16\x07SNetV160\x82\x01"0\r\x06\t*\x86H\x86\xf7\r\x01\x01\x01\x05\x00\x03\x82\x01\x0f\x000\x82\x01\n\x02\x82\x01\x01\x00\xbe\xb4^\xd9\xb5\xd8\xde|\x10\xe9\xc6\xec\x9e)*\xdd\x00io\xd8\x84>h\x1c\x12\xd9\x9d\xdf\x94\x89\x13\xb2C\x93\x1dW\xdcq/\x97@5\xd5$\x0f\xcf}\xfd\xd7#\xdfY\x0e\x04\\\x12\xba?==\xa9\xddJ\xa5jd3\x11L\xc8\xbfN\xc8"+Ti\x91\xbeA\xd4\xba\xbf\xcc[\xcf\x82\x8d$Y\x88)\xb7\xd8\xf8\xf7b\xa31\x16\xf4x\x92\xfcJ\xc2C\xf3\xd4\xc1;\xd1\xc8\xbd;vr)t\x868\x8a\xe3\xb34a\xb3)\x1d\xdf\tf\x8dx\x8c\xfa\xedm\xf3\xda\xae`\xfa\x80{\xcef6\xe2o+\xab\x11\xb1!\xeaB@\x03HD\xa9\x9ap\xc8\xec\xd9\xb1\xe6=\x84\x8a\x10\x868p\x18\x956\xed\xf54\xde\xfd\x18\x9b\xb9\xd7\xac\xba\xcb\xf3i\xf1fuC\xc90\x9f\xad\x7fq\xe7VI\xb2zv\x18Z\xd4\xc1<3f\x8c\x92\xde\xe3\xd0\x9e\xd8\x1c\x8f\x95\xb0\xea\xcaT\x83F\xf6\x9ej\xc7"\xe8I\x06P\x02Z?\x18\xa3N\xc7\xc6,\xb9\xac5r\'K\x02\x03\x01\x00\x01\xa3\x82\x01_0\x82\x01[0\x0c\x06\x03U\x1d\x13\x01\x01\xff\x04\x020\x000\x0e\x06\x03U\x1d\x0f\x01\x01\xff\x04\x04\x03\x02\x02\xf40 \x06\x03U\x1d%\x01\x01\xff\x04\x160\x14\x06\x08+\x06\x01\x05\x05\x07\x03\x01\x06\x08+\x06\x01\x05\x05\x07\x03\x020,\x06\t`\x86H\x01\x86\xf8B\x01\r\x04\x1f\x16\x1dOpenSSL Generated Certificate0\x1d\x06\x03U\x1d\x0e\x04\x16\x04\x14\xe7X\xf6\xc2\xb1\xb1\n\xb8\x1a\xc4H\xff61\xe5\x83\xde\x16Vr0h\x06\x03U\x1d#\x04a0_\x80\x14\xe7X\xf6\xc2\xb1\xb1\n\xb8\x1a\xc4H\xff61\xe5\x83\xde\x16Vr\xa1<\xa4:081\x1d0\x1b\x06\x03U\x04\x03\x0c\x14OPC.SimaticNET.S7OPT1\x170\x15\x06\n\t\x92&\x89\x93\xf2,d\x01\x19\x16\x07SNetV16\x82\t\x00\x80X\x0c\xd3\xfd\x19\xbf\x0b0b\x06\x03U\x1d\x11\x04[0Y\x86Nurn:Siemens.Automation.SimaticNET.S7OPT:(B1707412-DBE3-456B-98F1-40029ACA9F7E)\x82\x07SNetV160\r\x06\t*\x86H\x86\xf7\r\x01\x01\x0b\x05\x00\x03\x82\x01\x01\x00Q\xd3_\xedP0\xd2u\t\x04\xde\xe0\xef\x00(\xd21Tz2\xb8\xa4F&\xdeWl\x9a7Q=`n\xa5&\xb8Dv\x95y\x87H\xb1\xfa\xbf\x95\xc3\x11\xb4\x06\'\xb0\xf5\x05P\xcd\xd5;x\x97:\xaf\xe8\x8f\x1d\xf2\xc1\xe3\xbb\xef\r\xac4\xadLW(\x1awm\x94\x1f]\xec]\x86\xf8\xf2\xa7b\xbd\x91\x84%\xbf\x94y@\xb5\xe9\x89\xb6\x8c\xed\xc4\xb6a\xa9\\\xf7\xc3\xf3\xa9\xd7\xfc\xec\xc8\xb1\xfc\x93\xd6\xeaRQ\xbbr\xea\xef\xe2\xc7U\xe4z]\x88\xea\xfe\x99yI\xa3\xcf\xc3\xc4\xaf\xd7\xb3%\x0c|\xb2\xea\nB\xb5\xcb\xd9\xbfE\'\xa3\x14\x96\x8e\x1c\xd84$^\x93)7>\xa2E!y\x1a\x08\xff\r\xe5\x1f\xd2\x13\xa6\x05z\xe89\x9aF\x08A#\x8b\x0ep\xedr\xa3]\x841\xb7\xbd\xdb\x93g\xc4\x0e$\xe5\x00\x11\x94j\xbc\xf9\x8c>1\x18ek\x16E\x89\x17\xe3 \xf4h\x1d\x98R\xc1I\xfa\xa1\xdaG\xef^W\xe2\xa46{s\xef\xa8\xa7\x97\x1a\r', SecurityMode=<MessageSecurityMode.SignAndEncrypt: 3>, SecurityPolicyUri='http://opcfoundation.org/UA/SecurityPolicy#Basic256Sha256', UserIdentityTokens=[UserTokenPolicy(PolicyId='Anonymous', TokenType=<UserTokenType.Anonymous: 0>, IssuedTokenType=None, IssuerEndpointUrl=None, SecurityPolicyUri=None), UserTokenPolicy(PolicyId='UserName', TokenType=<UserTokenType.UserName: 1>, IssuedTokenType=None, IssuerEndpointUrl=None, SecurityPolicyUri='http://opcfoundation.org/UA/SecurityPolicy#Basic256Sha256')], TransportProfileUri='http://opcfoundation.org/UA-Profile/Transport/uatcp-uasc-uabinary', SecurityLevel=115), EndpointDescription(EndpointUrl='opc.tcp://SNetV16:55105', Server=ApplicationDescription(ApplicationUri='urn:Siemens.Automation.SimaticNET.S7OPT:(B1707412-DBE3-456B-98F1-40029ACA9F7E)', ProductUri='Siemens/SimaticNet/OpcUaServer/S7OPT', ApplicationName=LocalizedText(Locale='en', Text='OPC.SimaticNET.S7OPT'), ApplicationType_=<ApplicationType.Server: 0>, GatewayServerUri=None, DiscoveryProfileUri=None, DiscoveryUrls=['opc.tcp://SNetV16:55105']), ServerCertificate=b'0\x82\x04T0\x82\x03<\xa0\x03\x02\x01\x02\x02\t\x00\x80X\x0c\xd3\xfd\x19\xbf\x0b0\r\x06\t*\x86H\x86\xf7\r\x01\x01\x0b\x05\x00081\x1d0\x1b\x06\x03U\x04\x03\x0c\x14OPC.SimaticNET.S7OPT1\x170\x15\x06\n\t\x92&\x89\x93\xf2,d\x01\x19\x16\x07SNetV160\x1e\x17\r210116154629Z\x17\r410116154629Z081\x1d0\x1b\x06\x03U\x04\x03\x0c\x14OPC.SimaticNET.S7OPT1\x170\x15\x06\n\t\x92&\x89\x93\xf2,d\x01\x19\x16\x07SNetV160\x82\x01"0\r\x06\t*\x86H\x86\xf7\r\x01\x01\x01\x05\x00\x03\x82\x01\x0f\x000\x82\x01\n\x02\x82\x01\x01\x00\xbe\xb4^\xd9\xb5\xd8\xde|\x10\xe9\xc6\xec\x9e)*\xdd\x00io\xd8\x84>h\x1c\x12\xd9\x9d\xdf\x94\x89\x13\xb2C\x93\x1dW\xdcq/\x97@5\xd5$\x0f\xcf}\xfd\xd7#\xdfY\x0e\x04\\\x12\xba?==\xa9\xddJ\xa5jd3\x11L\xc8\xbfN\xc8"+Ti\x91\xbeA\xd4\xba\xbf\xcc[\xcf\x82\x8d$Y\x88)\xb7\xd8\xf8\xf7b\xa31\x16\xf4x\x92\xfcJ\xc2C\xf3\xd4\xc1;\xd1\xc8\xbd;vr)t\x868\x8a\xe3\xb34a\xb3)\x1d\xdf\tf\x8dx\x8c\xfa\xedm\xf3\xda\xae`\xfa\x80{\xcef6\xe2o+\xab\x11\xb1!\xeaB@\x03HD\xa9\x9ap\xc8\xec\xd9\xb1\xe6=\x84\x8a\x10\x868p\x18\x956\xed\xf54\xde\xfd\x18\x9b\xb9\xd7\xac\xba\xcb\xf3i\xf1fuC\xc90\x9f\xad\x7fq\xe7VI\xb2zv\x18Z\xd4\xc1<3f\x8c\x92\xde\xe3\xd0\x9e\xd8\x1c\x8f\x95\xb0\xea\xcaT\x83F\xf6\x9ej\xc7"\xe8I\x06P\x02Z?\x18\xa3N\xc7\xc6,\xb9\xac5r\'K\x02\x03\x01\x00\x01\xa3\x82\x01_0\x82\x01[0\x0c\x06\x03U\x1d\x13\x01\x01\xff\x04\x020\x000\x0e\x06\x03U\x1d\x0f\x01\x01\xff\x04\x04\x03\x02\x02\xf40 \x06\x03U\x1d%\x01\x01\xff\x04\x160\x14\x06\x08+\x06\x01\x05\x05\x07\x03\x01\x06\x08+\x06\x01\x05\x05\x07\x03\x020,\x06\t`\x86H\x01\x86\xf8B\x01\r\x04\x1f\x16\x1dOpenSSL Generated Certificate0\x1d\x06\x03U\x1d\x0e\x04\x16\x04\x14\xe7X\xf6\xc2\xb1\xb1\n\xb8\x1a\xc4H\xff61\xe5\x83\xde\x16Vr0h\x06\x03U\x1d#\x04a0_\x80\x14\xe7X\xf6\xc2\xb1\xb1\n\xb8\x1a\xc4H\xff61\xe5\x83\xde\x16Vr\xa1<\xa4:081\x1d0\x1b\x06\x03U\x04\x03\x0c\x14OPC.SimaticNET.S7OPT1\x170\x15\x06\n\t\x92&\x89\x93\xf2,d\x01\x19\x16\x07SNetV16\x82\t\x00\x80X\x0c\xd3\xfd\x19\xbf\x0b0b\x06\x03U\x1d\x11\x04[0Y\x86Nurn:Siemens.Automation.SimaticNET.S7OPT:(B1707412-DBE3-456B-98F1-40029ACA9F7E)\x82\x07SNetV160\r\x06\t*\x86H\x86\xf7\r\x01\x01\x0b\x05\x00\x03\x82\x01\x01\x00Q\xd3_\xedP0\xd2u\t\x04\xde\xe0\xef\x00(\xd21Tz2\xb8\xa4F&\xdeWl\x9a7Q=`n\xa5&\xb8Dv\x95y\x87H\xb1\xfa\xbf\x95\xc3\x11\xb4\x06\'\xb0\xf5\x05P\xcd\xd5;x\x97:\xaf\xe8\x8f\x1d\xf2\xc1\xe3\xbb\xef\r\xac4\xadLW(\x1awm\x94\x1f]\xec]\x86\xf8\xf2\xa7b\xbd\x91\x84%\xbf\x94y@\xb5\xe9\x89\xb6\x8c\xed\xc4\xb6a\xa9\\\xf7\xc3\xf3\xa9\xd7\xfc\xec\xc8\xb1\xfc\x93\xd6\xeaRQ\xbbr\xea\xef\xe2\xc7U\xe4z]\x88\xea\xfe\x99yI\xa3\xcf\xc3\xc4\xaf\xd7\xb3%\x0c|\xb2\xea\nB\xb5\xcb\xd9\xbfE\'\xa3\x14\x96\x8e\x1c\xd84$^\x93)7>\xa2E!y\x1a\x08\xff\r\xe5\x1f\xd2\x13\xa6\x05z\xe89\x9aF\x08A#\x8b\x0ep\xedr\xa3]\x841\xb7\xbd\xdb\x93g\xc4\x0e$\xe5\x00\x11\x94j\xbc\xf9\x8c>1\x18ek\x16E\x89\x17\xe3 \xf4h\x1d\x98R\xc1I\xfa\xa1\xdaG\xef^W\xe2\xa46{s\xef\xa8\xa7\x97\x1a\r', SecurityMode=<MessageSecurityMode.SignAndEncrypt: 3>, SecurityPolicyUri='http://opcfoundation.org/UA/SecurityPolicy#Aes128_Sha256_RsaOaep', UserIdentityTokens=[UserTokenPolicy(PolicyId='Anonymous', TokenType=<UserTokenType.Anonymous: 0>, IssuedTokenType=None, IssuerEndpointUrl=None, SecurityPolicyUri=None), UserTokenPolicy(PolicyId='UserName', TokenType=<UserTokenType.UserName: 1>, IssuedTokenType=None, IssuerEndpointUrl=None, SecurityPolicyUri='http://opcfoundation.org/UA/SecurityPolicy#Aes128_Sha256_RsaOaep')], TransportProfileUri='http://opcfoundation.org/UA-Profile/Transport/uatcp-uasc-uabinary', SecurityLevel=120), EndpointDescription(EndpointUrl='opc.tcp://SNetV16:55105', Server=ApplicationDescription(ApplicationUri='urn:Siemens.Automation.SimaticNET.S7OPT:(B1707412-DBE3-456B-98F1-40029ACA9F7E)', ProductUri='Siemens/SimaticNet/OpcUaServer/S7OPT', ApplicationName=LocalizedText(Locale='en', Text='OPC.SimaticNET.S7OPT'), ApplicationType_=<ApplicationType.Server: 0>, GatewayServerUri=None, DiscoveryProfileUri=None, DiscoveryUrls=['opc.tcp://SNetV16:55105']), 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\xf4h\x1d\x98R\xc1I\xfa\xa1\xdaG\xef^W\xe2\xa46{s\xef\xa8\xa7\x97\x1a\r', SecurityMode=<MessageSecurityMode.SignAndEncrypt: 3>, SecurityPolicyUri='http://opcfoundation.org/UA/SecurityPolicy#Aes256_Sha256_RsaPss', UserIdentityTokens=[UserTokenPolicy(PolicyId='Anonymous', TokenType=<UserTokenType.Anonymous: 0>, IssuedTokenType=None, IssuerEndpointUrl=None, SecurityPolicyUri=None), UserTokenPolicy(PolicyId='UserName', TokenType=<UserTokenType.UserName: 1>, IssuedTokenType=None, IssuerEndpointUrl=None, SecurityPolicyUri='http://opcfoundation.org/UA/SecurityPolicy#Aes256_Sha256_RsaPss')], TransportProfileUri='http://opcfoundation.org/UA-Profile/Transport/uatcp-uasc-uabinary', SecurityLevel=125)] <MessageSecurityMode.None_: 1> 'http://opcfoundation.org/UA/SecurityPolicy#None'
INFO:asyncua.client.ua_client.UaClient:activate_session
INFO:/home/david/python/opcua/main.py:user disconnect
INFO:asyncua.client.client:disconnect
INFO:asyncua.client.ua_client.UaClient:close_session
INFO:asyncua.client.ua_client.UASocketProtocol:close_secure_channel
INFO:asyncua.client.ua_client.UASocketProtocol:Request to close socket received
INFO:asyncua.client.ua_client.UASocketProtocol:Socket has closed connection
INFO:/home/david/python/opcua/main.py:user connect
ERROR:/home/david/python/opcua/main.py:could not post <coroutine object Client.connect at 0x79c47c74bed0> since asyncio loop in thread has not been started or has been stopped
Traceback (most recent call last):
  File "/home/david/python/opcua/main.py", line 30, in <module>
    client.connect()
  File "/home/david/python/opcua/.venv/lib/python3.12/site-packages/asyncua/sync.py", line 110, in wrapper
    result = self.tloop.post(aio_func(*args, **kwargs))
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/david/python/opcua/.venv/lib/python3.12/site-packages/asyncua/sync.py", line 64, in post
    raise ThreadLoopNotRunning(f"could not post {coro} since asyncio loop in thread has not been started or has been stopped")
asyncua.sync.ThreadLoopNotRunning: could not post <coroutine object Client.connect at 0x79c47c74bed0> since asyncio loop in thread has not been started or has been stopped
/home/david/python/opcua/main.py:33: RuntimeWarning: coroutine 'Client.connect' was never awaited
  logger.exception(err)
RuntimeWarning: Enable tracemalloc to get the object allocation traceback
Traceback (most recent call last):
  File "/home/david/python/opcua/.venv/lib/python3.12/site-packages/asyncua/sync.py", line 257, in disconnect
    self.tloop.post(self.aio_obj.disconnect())
  File "/home/david/python/opcua/.venv/lib/python3.12/site-packages/asyncua/sync.py", line 64, in post
    raise ThreadLoopNotRunning(f"could not post {coro} since asyncio loop in thread has not been started or has been stopped")
asyncua.sync.ThreadLoopNotRunning: could not post <coroutine object Client.disconnect at 0x79c47c6720c0> since asyncio loop in thread has not been started or has been stopped

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/david/python/opcua/main.py", line 36, in <module>
    client.disconnect()
  File "/home/david/python/opcua/.venv/lib/python3.12/site-packages/asyncua/sync.py", line 260, in disconnect
    self.tloop.stop()
  File "/home/david/python/opcua/.venv/lib/python3.12/site-packages/asyncua/sync.py", line 58, in stop
    self.loop.call_soon_threadsafe(self.loop.stop)
  File "/usr/lib/python3.12/asyncio/base_events.py", line 840, in call_soon_threadsafe
    self._check_closed()
  File "/usr/lib/python3.12/asyncio/base_events.py", line 541, in _check_closed
    raise RuntimeError('Event loop is closed')
RuntimeError: Event loop is closed
sys:1: RuntimeWarning: coroutine 'Client.disconnect' was never awaited
RuntimeWarning: Enable tracemalloc to get the object allocation traceback

Version:

$ pip show asyncua
Name: asyncua
Version: 1.1.5
Summary: Pure Python OPC-UA client and server library
Home-page: http://freeopcua.github.io/
Author: Olivier Roulet-Dubonnet
Author-email: [email protected]
License: GNU Lesser General Public License v3 or later
Location: /home/david/python/opcua/.venv/lib/python3.12/site-packages
Requires: aiofiles, aiosqlite, cryptography, pyOpenSSL, python-dateutil, pytz, sortedcontainers, typing-extensions
Required-by:

$ uname -a
Linux DevLaptop 6.8.0-45-generic #45-Ubuntu SMP PREEMPT_DYNAMIC Fri Aug 30 12:02:04 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux