Create types in separate file in communication package

communication/types.go

@@ -0,0 +1,26 @@
+package communication
+
+type ClientForServer struct {
+	ID       uint16
+	Nickname string
+}
+
+type RegisteredUser struct {
+	ID uint16
+}
+
+const (
+	LINK_STATUS_CREATED = 1 + iota
+	LINK_STATUS_EXPIRED
+)
+
+const (
+	LINK_LEN_V1 = 32
+)
+
+// NOTE: Data should be 32 or 64 bytes
+type Link struct {
+	Status   uint8
+	Data     []byte
+	UseCount uint32
+}