diff --git a/opcua/api/transport.go b/opcua/api/transport.go
index cf63560dfef..b116f3c96cc 100644
--- a/opcua/api/transport.go
+++ b/opcua/api/transport.go
@@ -24,6 +24,9 @@ const (
 
 	defOffset = 0
 	defLimit  = 10
+
+	defNamespace  = "ns=0" // Standard root namespace
+	defIdentifier = "i=84" // Standard root identifier
 )
 
 var (
@@ -68,6 +71,11 @@ func decodeBrowse(_ context.Context, r *http.Request) (interface{}, error) {
 		return nil, err
 	}
 
+	if n == "" || i == "" {
+		n = defNamespace
+		i = defIdentifier
+	}
+
 	req := browseReq{
 		ServerURI:  s,
 		Namespace:  n,
diff --git a/opcua/gopcua/browser.go b/opcua/gopcua/browser.go
index 8e187d7e386..b6209409401 100644
--- a/opcua/gopcua/browser.go
+++ b/opcua/gopcua/browser.go
@@ -14,7 +14,7 @@ import (
 	"github.com/mainflux/mainflux/opcua"
 )
 
-const maxChildrens = 7
+const maxChildrens = 5 // max browsing node children level
 
 // NodeDef represents the node browser responnse
 type NodeDef struct {
@@ -180,31 +180,42 @@ func browse(n *opcuaGopcua.Node, path string, level int) ([]NodeDef, error) {
 		nodes = append(nodes, def)
 	}
 
-	browseChildren := func(refType uint32) error {
-		refs, err := n.ReferencedNodes(refType, uaGopcua.BrowseDirectionForward, uaGopcua.NodeClassAll, true)
-		if err != nil {
-			return err
-		}
-
-		for _, rn := range refs {
-			children, err := browse(rn, def.Path, level+1)
-			if err != nil {
-				return err
-			}
-			nodes = append(nodes, children...)
-		}
-		return nil
+	bc, err := browseChildren(n, def.Path, level, id.HasComponent)
+	if err != nil {
+		return nil, err
 	}
+	nodes = append(nodes, bc...)
 
-	if err := browseChildren(id.HasComponent); err != nil {
+	bc, err = browseChildren(n, def.Path, level, id.Organizes)
+	if err != nil {
 		return nil, err
 	}
-	if err := browseChildren(id.Organizes); err != nil {
+	nodes = append(nodes, bc...)
+
+	bc, err = browseChildren(n, def.Path, level, id.HasProperty)
+	if err != nil {
 		return nil, err
 	}
-	if err := browseChildren(id.HasProperty); err != nil {
-		return nil, err
+	nodes = append(nodes, bc...)
+
+	return nodes, nil
+}
+
+func browseChildren(n *opcuaGopcua.Node, path string, level int, typeDef uint32) ([]NodeDef, error) {
+	nodes := []NodeDef{}
+	refs, err := n.ReferencedNodes(typeDef, uaGopcua.BrowseDirectionForward, uaGopcua.NodeClassAll, true)
+	if err != nil {
+		return []NodeDef{}, err
 	}
+
+	for _, rn := range refs {
+		children, err := browse(rn, path, level+1)
+		if err != nil {
+			return []NodeDef{}, err
+		}
+		nodes = append(nodes, children...)
+	}
+
 	return nodes, nil
 }
 
diff --git a/opcua/gopcua/subscribe.go b/opcua/gopcua/subscribe.go
index f3c18ce4d77..19058162b74 100644
--- a/opcua/gopcua/subscribe.go
+++ b/opcua/gopcua/subscribe.go
@@ -167,20 +167,22 @@ func (c client) runHandler(sub *opcuaGopcua.Subscription, uri, node string) erro
 					case uaGopcua.TypeIDBoolean:
 						msg.DataKey = "vb"
 						msg.Data = item.Value.Value.Bool()
-					case uaGopcua.TypeIDString:
+					case uaGopcua.TypeIDString, uaGopcua.TypeIDByteString:
 						msg.DataKey = "vs"
 						msg.Data = item.Value.Value.String()
+					case uaGopcua.TypeIDDataValue:
+						msg.DataKey = "vd"
+						msg.Data = item.Value.Value.String()
 					case uaGopcua.TypeIDInt64, uaGopcua.TypeIDInt32, uaGopcua.TypeIDInt16:
 						msg.Data = float64(item.Value.Value.Int())
-					case uaGopcua.TypeIDUint64:
+					case uaGopcua.TypeIDUint64, uaGopcua.TypeIDUint32, uaGopcua.TypeIDUint16:
 						msg.Data = float64(item.Value.Value.Uint())
 					case uaGopcua.TypeIDFloat, uaGopcua.TypeIDDouble:
 						msg.Data = item.Value.Value.Float()
 					case uaGopcua.TypeIDByte:
-						msg.DataKey = "vs"
-						msg.Data = string(item.Value.Value.EncodingMask())
+						msg.Data = float64(item.Value.Value.Uint())
 					case uaGopcua.TypeIDDateTime:
-						msg.Data = item.Value.Value.Time()
+						msg.Data = item.Value.Value.Time().Unix()
 					default:
 						msg.Data = 0
 					}
diff --git a/opcua/service.go b/opcua/service.go
index e72eb03920c..21e48c5a2f7 100644
--- a/opcua/service.go
+++ b/opcua/service.go
@@ -12,7 +12,6 @@ import (
 )
 
 const protocol = "opcua"
-const defNodeID = "ns=0;i=84"
 
 var (
 	// ErrMalformedEntity indicates malformed entity specification.
@@ -140,11 +139,7 @@ func (as *adapterService) ConnectThing(mfxChanID, mfxThingID string) error {
 }
 
 func (as *adapterService) Browse(serverURI, namespace, identifier string) ([]BrowsedNode, error) {
-	nodeID := defNodeID
-
-	if namespace != "" && identifier != "" {
-		nodeID = fmt.Sprintf("%s;%s", namespace, identifier)
-	}
+	nodeID := fmt.Sprintf("%s;%s", namespace, identifier)
 
 	nodes, err := as.browser.Browse(serverURI, nodeID)
 	if err != nil {