forked from FreeOpcUa/python-opcua
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathserver-enum.py
More file actions
98 lines (78 loc) · 2.83 KB
/
Copy pathserver-enum.py
File metadata and controls
98 lines (78 loc) · 2.83 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
'''
This example demonstrates the use of custom enums by:
- Create a custom enum type
- Create an object that contains a variable of this type
'''
import sys
sys.path.insert(0, "..")
try:
from IPython import embed
except ImportError:
import code
def embed():
vars = globals()
vars.update(locals())
shell = code.InteractiveConsole(vars)
shell.interact()
interactive = True
from opcua import ua, Server
from opcua.common import node
from enum import IntEnum
# Not required just for convenience
# Because this example is based on EnumStrings, the values should start at 0 and no gaps are allowed.
class MyEnum(IntEnum):
ok = 0
idle = 1
# helper method to automatically create string list
def enum_to_stringlist(a_enum):
items = []
for value in a_enum:
items.append(ua.LocalizedText(value.name))
return items
if __name__ == "__main__":
# setup our server
server = Server()
server.set_endpoint("opc.tcp://0.0.0.0:4840/freeopcua/server/")
# setup our own namespace, not really necessary but should as spec
uri = "http://examples.freeopcua.github.io"
nsidx = server.register_namespace(uri)
# --------------------------------------------------------
# create custom enum data type
# --------------------------------------------------------
enums = server.get_root_node().get_child(["0:Types", "0:DataTypes", "0:BaseDataType", "0:Enumeration"])
# 1.
# Create Enum Type
myenum_type = enums.add_data_type(nsidx, 'MyEnum')
# 2.
# Add enumerations as EnumStrings (Not yet tested with EnumValues)
# Essential to use namespace 0 for EnumStrings !
# By hand
# es = myenum_type.add_variable(0, "EnumStrings" , [ua.LocalizedText("ok"),
# ua.LocalizedText("idle")])
# Or convert the existing IntEnum MyEnum
es = myenum_type.add_variable(0, "EnumStrings" , enum_to_stringlist(MyEnum))
es.set_value_rank(1)
es.set_array_dimensions([0])
# --------------------------------------------------------
# create object with enum variable
# --------------------------------------------------------
# get Objects node, this is where we should put our custom stuff
objects = server.get_objects_node()
# create object
myobj = objects.add_object(nsidx, 'MyObjectWithEnumVar')
# add var with as type the custom enumeration
myenum_var = myobj.add_variable(nsidx, 'MyEnum2Var', MyEnum.ok, datatype = myenum_type.nodeid)
myenum_var.set_writable()
myenum_var.set_value(MyEnum.idle) # change value of enumeration
server.start()
try:
if interactive:
embed()
else:
while True:
time.sleep(0.5)
except IOError:
pass
finally:
server.stop()
print("done")