From cae888b9f2aa1a5b7826d2c4cb4de37f1274d39c Mon Sep 17 00:00:00 2001
From: jonathan <github@jonathan.camp>
Date: Thu, 26 Sep 2019 15:44:26 +0200
Subject: [PATCH] add type id 0x00 support

---
 ua/enums.go   | 1 +
 ua/variant.go | 1 +
 2 files changed, 2 insertions(+)

diff --git a/ua/enums.go b/ua/enums.go
index 6131fd02..ec5018c6 100644
--- a/ua/enums.go
+++ b/ua/enums.go
@@ -58,6 +58,7 @@ const (
 type TypeID byte
 
 const (
+	TypeIDNull            TypeID = 0 // not part of specification but some servers (e.g. Prosys) return it anyway
 	TypeIDBoolean         TypeID = 1
 	TypeIDSByte           TypeID = 2
 	TypeIDByte            TypeID = 3
diff --git a/ua/variant.go b/ua/variant.go
index e5ad89b5..e1fca5de 100644
--- a/ua/variant.go
+++ b/ua/variant.go
@@ -542,6 +542,7 @@ func (m *Variant) Time() time.Time {
 
 var variantTypeToTypeID = map[reflect.Type]TypeID{}
 var variantTypeIDToType = map[TypeID]reflect.Type{
+	TypeIDNull:            reflect.TypeOf(nil),
 	TypeIDBoolean:         reflect.TypeOf(false),
 	TypeIDSByte:           reflect.TypeOf(int8(0)),
 	TypeIDByte:            reflect.TypeOf(uint8(0)),