except UafError, e:
print("Some error occurred: %s" %e)
print("")
print("Third option: use the convenience function beginRead() to read data asynchronously")
print("==================================================================================")
# notice we enable asynchronous communication now by providing the printResult() method as
# a callback function!
try:
asyncReadResult = myClient.beginRead(addresses = [someDoubleNode, someUInt32Node,
someStringNode, someLocalizedTextNode,
someSByteArrayNode],
serviceConfig = serviceConfig, # optional argument
sessionConfig = sessionConfig, # optional argument
callback = printResult) # callback function!
# check if there was an "immediate" error on the client side when executing the asynchronous
# service call:
if asyncReadResult.overallStatus.isGood():
print("OK, the client could invoke the asynchronous request without problems.")
print("Let's wait a second for the result ...")
time.sleep(1)
print("The read result should have been received by now!")
except UafError, e:
print("Some error occurred: %s" %e)
time.sleep(1) # wait one second for the async call result to arrive (and the callback function to be called)
# =====================================================================================================================
print("")
print("Asynchronous reading")
print("====================")
print("")
def printMyAsyncReadResult(asyncResult):
print(" --> received async read result:")
print(" - temperature setpoint : %.3f" %asyncResult.targets[0].data.value)
print(" - heater setpoint : %d" %asyncResult.targets[1].data.value)
immediateResult = myClient.beginRead( addresses = [address_TSetpoint, address_HeaterStatus],
callback = printMyAsyncReadResult )
time.sleep(1) # wait one second for the async call result to arrive (and the callback function to be called)
# =====================================================================================================================
print("")
print("Asynchronous writing")
print("====================")
print("")
def printMyAsyncWriteResult(asyncResult):
print(" --> received async write result:")
print(" - write status : %s" %asyncResult.targets[0].status)
print("")
print("Asynchronous reading")
print("====================")
print("")
def printMyAsyncReadResult(asyncResult):
print(" --> received async read result:")
print(" - temperature setpoint : %.3f" %
asyncResult.targets[0].data.value)
print(" - heater setpoint : %d" %
asyncResult.targets[1].data.value)
immediateResult = myClient.beginRead(
addresses=[address_TSetpoint, address_HeaterStatus],
callback=printMyAsyncReadResult)
time.sleep(
1
) # wait one second for the async call result to arrive (and the callback function to be called)
# =====================================================================================================================
print("")
print("Asynchronous writing")
print("====================")
print("")
def printMyAsyncWriteResult(asyncResult):
print(" --> received async write result:")
except UafError, e:
print("Some error occurred: %s" %e)
print("")
print("Third option: use the convenience function beginRead() to read data asynchronously")
print("==================================================================================")
# notice we enable asynchronous communication now by providing the printResult() method as
# a callback function!
try:
asyncReadResult = myClient.beginRead(addresses = [someDoubleNode, someUInt32Node,
someStringNode, someLocalizedTextNode,
someSByteArrayNode],
serviceSettings = serviceSettings, # optional argument
sessionSettings = sessionSettings, # optional argument
callback = printResult) # callback function!
# check if there was an "immediate" error on the client side when executing the asynchronous
# service call:
if asyncReadResult.overallStatus.isGood():
print("OK, the client could invoke the asynchronous request without problems.")
print("Let's wait a second for the result ...")
time.sleep(1)
print("The read result should have been received by now!")
except UafError, e:
print("Some error occurred: %s" %e)
