def download_xst(subband: int,
integration_time_s: int,
url: str = 'localhost',
port: int = 50000):
"""
Download cross correlation statistics
Args:
subband (int): Subband number
integration_time_s (int): Integration time in seconds
url (str): URL to connect to, defaults to 'localhost'
port (str): Port to connect to, defaults to 50000
Returns:
Tuple[datetime.datetime, np.ndarray, int]: UTC time, visibilities (shape n_ant x n_ant),
RCU mode
Raises:
RuntimeError: if in mixed RCU mode
"""
client = Client("opc.tcp://{}:{}/".format(url, port), timeout=1000)
client.connect()
client.load_type_definitions()
objects = client.get_objects_node()
idx = client.get_namespace_index(DEFAULT_URI)
obj = client.get_root_node().get_child(
["0:Objects", "{}:StationMetrics".format(idx), "{}:RCU".format(idx)])
obstime, visibilities_opc, rcu_modes = obj.call_method(
"{}:record_cross".format(idx), subband, integration_time_s)
client.close_session()
client.close_secure_channel()
rcu_modes_on = set([mode for mode in rcu_modes if mode != '0'])
if len(rcu_modes_on) == 1:
rcu_mode = int(rcu_modes_on.pop())
elif len(rcu_modes_on) == 0:
rcu_mode = 0
else:
raise RuntimeError(
"Multiple nonzero RCU modes are used, that's not supported yet")
assert (len(visibilities_opc) == 2) # Real and complex part
visibilities = np.array(visibilities_opc)[0] + 1j * np.array(
visibilities_opc[1])
return obstime, visibilities, rcu_mode
from opcua import Client
client = Client('opc.tcp://127.0.0.1:51213')
client.connect()
client.get_namespace_array()
objects_node = client.get_objects_node()
# Print children nodes
print(objects_node.get_children(), flush=True)
# Get directly a specific node
temperature = client.get_node('ns=2;s="temperature"')
# get a node value (if it's a variable)
temperature.get_value()
light_bulb_state = client.get_node('ns=2;s="light_bulb_state"')
# If the variable is writable, its value can be set from the client side
light_bulb_state.set_value(True)
# Close client session (the servere remains connected)
client.close_session()
myfloat = client.get_node("ns=4;s=Float")
mydouble = client.get_node("ns=4;s=Double")
myint64 = client.get_node("ns=4;s=Int64")
myuint64 = client.get_node("ns=4;s=UInt64")
myint32 = client.get_node("ns=4;s=Int32")
myuint32 = client.get_node("ns=4;s=UInt32")
var = client.get_node(ua.NodeId("Random1", 5))
print("var is: ", var)
print("value of var is: ", var.get_value())
var.set_value(ua.Variant([23], ua.VariantType.Double))
print("setting float value")
myfloat.set_value(ua.Variant(1.234, ua.VariantType.Float))
print("reading float value: ", myfloat.get_value())
handler = SubHandler()
sub = client.create_subscription(500, handler)
sub.subscribe_data_change(var)
device = objects.get_child(["2:MyObjects", "2:MyDevice"])
method = device.get_child("2:MyMethod")
result = device.call_method(method, ua.Variant("sin"), ua.Variant(180, ua.VariantType.Double))
print("Mehtod result is: ", result)
embed()
client.close_session()
finally:
client.disconnect()
