def set_value(self, node_id, value_type_identifier, desired_value):
"""Set value on the OPC UA server. example parameters:
Node_id=ns=4;s=node_name,
value_type_identifier 0-25
see: https://github.com/FreeOpcUa/python-opcua/blob/master/opcua/ua/uatypes.py#L619),
desired_value could be any value that matches the UA Type
"""
parsed_value, opc_type = map_to_opcua_type_and_value(
value_type_identifier, desired_value)
self.ensure_connection()
node = self._client.get_node(node_id)
dv = ua.DataValue(ua.Variant(parsed_value, opc_type))
node.set_value(dv)
def test_when_passed_in_identifier_as_14_should_parse_to_guid():
value, opc_type = utility.map_to_opcua_type_and_value(14, '3ca5c721-cb26-4be5-92a5-ac6f413113be')
assert type(value) is uid.UUID
assert opc_type == ua.VariantType.Guid
# TODO: we should add more tests for routes
def test_when_passed_in_identifier_as_13_should_parse_to_datetime():
value, opc_type = utility.map_to_opcua_type_and_value(13, '2018-08-15 10:10:00')
print(str(value))
assert type(value) is datetime
assert opc_type == ua.VariantType.DateTime
def test_when_passed_in_identifier_as_0_should_parse_to_null():
value, opc_type = utility.map_to_opcua_type_and_value(0, '')
assert value is None
assert opc_type == ua.VariantType.Null
def test_when_passed_in_identifier_as_12_should_parse_to_string():
value, opc_type = utility.map_to_opcua_type_and_value(12, 'I am a string')
assert type(value) is str
assert opc_type == ua.VariantType.String
def test_when_passed_in_identifier_as_11_should_parse_to_double():
value, opc_type = utility.map_to_opcua_type_and_value(11, '100.11')
assert type(value) is float
assert opc_type == ua.VariantType.Double
def test_when_passed_in_identifier_as_10_should_parse_to_float():
value, opc_type = utility.map_to_opcua_type_and_value(10, '100.0')
assert type(value) is float
assert opc_type == ua.VariantType.Float
def test_when_passed_in_identifier_as_9_should_parse_to_uint64():
value, opc_type = utility.map_to_opcua_type_and_value(9, '99')
assert type(value) is int
assert opc_type == ua.VariantType.UInt64
def test_when_passed_in_identifier_as_6_should_parse_to_int32():
value, opc_type = utility.map_to_opcua_type_and_value(6, '66')
assert type(value) is int
assert opc_type == ua.VariantType.Int32
def test_when_passed_in_identifier_as_3_should_parse_to_byte():
value, opc_type = utility.map_to_opcua_type_and_value(3, '1')
assert type(value) is int
assert value is 1
assert opc_type == ua.VariantType.Byte
def test_when_passed_in_identifier_as_1_should_parse_to_boolean():
value, opc_type = utility.map_to_opcua_type_and_value(1, 'true')
assert type(value) is bool
assert value is True
assert opc_type == ua.VariantType.Boolean
