fix: Fix connection interface binding, JSON lease DB

pkg/util/util.go

@@ -0,0 +1,11 @@
+package util
+
+import (
+	"encoding/binary"
+)
+
+func U32ToByte(u uint32) []byte {
+	buf := make([]byte, 4)
+	binary.BigEndian.PutUint32(buf, u)
+	return buf
+}