correctly import/export BytestringNodeId

asyncua/ua/uatypes.py

@@ -487,7 +487,7 @@ class NodeId:
                 identifier = uuid.UUID(f"urn:uuid:{v}")
             elif k == "b":
                 ntype = NodeIdType.ByteString
-                identifier = v
+                identifier = bytes(v, 'utf-8')
             elif k == "srv":
                 srv = int(v)
             elif k == "nsu":
@@ -502,6 +502,7 @@ class NodeId:
         string = []
         if self.NamespaceIndex != 0:
             string.append(f"ns={self.NamespaceIndex}")
+        identifier = self.Identifier
         ntype = None
         if self.NodeIdType == NodeIdType.Numeric:
             ntype = "i"
@@ -515,7 +516,8 @@ class NodeId:
             ntype = "g"
         elif self.NodeIdType == NodeIdType.ByteString:
             ntype = "b"
-        string.append(f"{ntype}={self.Identifier}")
+            identifier = identifier.decode()
+        string.append(f"{ntype}={identifier}")
         return ";".join(string)
 
     def to_binary(self):

tests/test_unit.py

@@ -337,7 +337,15 @@ def test_nodeid_guid_string():
     s = n.to_string()
     n2 = ua.NodeId.from_string(s)
     s2 = n2.to_string()
-    print(n, n2, s, s2)
+    assert n == n2
+    assert s == s2
+
+
+def test_nodeid_bytestring():
+    n = ua.ByteStringNodeId(Identifier=b"qwerty", NamespaceIndex=1)
+    s = n.to_string()
+    n2 = ua.NodeId.from_string(s)
+    s2 = n2.to_string()
     assert n == n2
     assert s == s2