# ================================================================================================== # 2) Overriding the defaults # ================================================================================================== # If needed, you can also configure the settings for each service call, using the **kwargs arguments # of read/write/call/... # e.g. set some special session settings for a specific read() call: mySessionSettings = SessionSettings() mySessionSettings.connectTimeoutSec = 0.5 mySessionSettings.sessionTimeoutSec = 100.0 # simply mention 'sessionSettings = ...' to use these settings as a **kwarg: myClient.read( [address0, address1], sessionSettings = mySessionSettings ) # e.g. set some special service settings for a specific read() call: myReadSettings = ReadSettings() myReadSettings.callTimeoutSec = 0.5 myReadSettings.maxAgeSec = 1.0 # simply mention 'serviceSettings = ...' to use these settings as a **kwarg: myClient.read( [address0, address1], serviceSettings = myReadSettings ) # or combine them: myClient.read( [address0, address1], serviceSettings = myReadSettings, sessionSettings = mySessionSettings ) # e.g. set some special subscription settings for a specific createMonitoredData() call: mySubscriptionSettings = SubscriptionSettings() mySubscriptionSettings.publishingIntervalSec = 2.0 mySubscriptionSettings.priority = 20 myClient.createMonitoredData( [address0, address1], subscriptionSettings = mySubscriptionSettings ) # Both the SessionSettings and SubscriptionSettings have a special 'unique' attribute, which # can be True or False.
settings.applicationName = "MyClient"
settings.discoveryUrls.append("opc.tcp://localhost:48010")
# create the client
myClient = Client(settings)
# read the node attributes all at once
print("")
print("First option: use the convenience function read() to read data synchronously")
print("============================================================================")
# OPTIONAL: You could also provide a ReadSettings to configure a call timeout,
# or maximum age of the values, or ...
serviceSettings = ReadSettings()
serviceSettings.callTimeoutSec = 0.5
serviceSettings.maxAgeSec = 1.0
# OPTIONAL: And you could also provide a SessionConfig to configure the sessions
# (e.g. set the timeout to 600.0 seconds)
# For more info about SessionConfigs, see the sessionconfig_example
sessionSettings = SessionSettings()
sessionSettings.sessionTimeoutSec = 600.0
try:
# now read the node attributes
readResult = myClient.read( addresses = [someDoubleNode, someUInt32Node, someStringNode,
someLocalizedTextNode, someSByteArrayNode],
serviceSettings = serviceSettings, # optional argument
sessionSettings = sessionSettings) # optional argument
# ==================================================================================================
# 2) Overriding the defaults
# ==================================================================================================
# If needed, you can also configure the settings for each service call, using the **kwargs arguments
# of read/write/call/...
# e.g. set some special session settings for a specific read() call:
mySessionSettings = SessionSettings()
mySessionSettings.connectTimeoutSec = 0.5
mySessionSettings.sessionTimeoutSec = 100.0
# simply mention 'sessionSettings = ...' to use these settings as a **kwarg:
myClient.read([address0, address1], sessionSettings=mySessionSettings)
# e.g. set some special service settings for a specific read() call:
myReadSettings = ReadSettings()
myReadSettings.callTimeoutSec = 0.5
myReadSettings.maxAgeSec = 1.0
# simply mention 'serviceSettings = ...' to use these settings as a **kwarg:
myClient.read([address0, address1], serviceSettings=myReadSettings)
# or combine them:
myClient.read([address0, address1],
serviceSettings=myReadSettings,
sessionSettings=mySessionSettings)
# e.g. set some special subscription settings for a specific createMonitoredData() call:
mySubscriptionSettings = SubscriptionSettings()
mySubscriptionSettings.publishingIntervalSec = 2.0
mySubscriptionSettings.priority = 20
myClient.createMonitoredData([address0, address1],
subscriptionSettings=mySubscriptionSettings)
myClientSettings.defaultReadSettings.callTimeoutSec = 2.0
myClientSettings.defaultReadSettings.maxAgeSec = 10.0
myClientSettings.defaultMethodCallSettings.callTimeoutSec = 2.0
myClientSettings.defaultWriteSettings.callTimeoutSec = 2.0
myClientSettings.defaultBrowseSettings.callTimeoutSec = 2.0
# and so on, and so on ...
# the clientSettings are in use as soon as you provide them again to the Client:
myClient.setClientSettings(myClientSettings)
# In case you want to choose different settings for specific read/write/... calls, then you can
# provide them also:
mySpecialSessionSettings = SessionSettings()
mySpecialSessionSettings.sessionTimeoutSec = 500.0
mySpecialSessionSettings.connectTimeoutSec = 0.5
mySpecialReadSettings = ReadSettings()
mySpecialReadSettings.callTimeoutSec = 2.0
mySpecialReadSettings.maxAgeSec = 10.0
result = myClient.read(addresses = [address_TSetpoint, address_HeaterStatus],
attributeId = pyuaf.util.attributeids.DisplayName,
sessionSettings = mySpecialSessionSettings,
serviceSettings = mySpecialReadSettings)
print("")
print("################################################################################################################")
print("Step 6: Learn how 'requests' and 'results' actually look like, and how you can configure them even more in detail")
print("################################################################################################################")
print("")
myClientSettings.defaultReadSettings.callTimeoutSec = 2.0
myClientSettings.defaultReadSettings.maxAgeSec = 10.0
myClientSettings.defaultMethodCallSettings.callTimeoutSec = 2.0
myClientSettings.defaultWriteSettings.callTimeoutSec = 2.0
myClientSettings.defaultBrowseSettings.callTimeoutSec = 2.0
# and so on, and so on ...
# the clientSettings are in use as soon as you provide them again to the Client:
myClient.setClientSettings(myClientSettings)
# In case you want to choose different settings for specific read/write/... calls, then you can
# provide them also:
mySpecialSessionSettings = SessionSettings()
mySpecialSessionSettings.sessionTimeoutSec = 500.0
mySpecialSessionSettings.connectTimeoutSec = 0.5
mySpecialReadSettings = ReadSettings()
mySpecialReadSettings.callTimeoutSec = 2.0
mySpecialReadSettings.maxAgeSec = 10.0
result = myClient.read(
addresses=[address_TSetpoint, address_HeaterStatus],
attributeId=pyuaf.util.attributeids.DisplayName,
sessionSettings=mySpecialSessionSettings,
serviceSettings=mySpecialReadSettings,
)
print("")
print(
"################################################################################################################"
)