diff --git a/avr/modules/network/msg/genref-d.asm b/avr/modules/network/msg/genref-d.asm
new file mode 100644
index 0000000..f2a50d4
--- /dev/null
+++ b/avr/modules/network/msg/genref-d.asm
@@ -0,0 +1,24 @@
+; ***************************************************************************
+; copyright   : (C) 2026 by Martin Preuss
+; email       : martin@libchipcard.de
+;
+; ***************************************************************************
+; * This file is part of the project "AqHome".                              *
+; * Please see toplevel file COPYING of that project for license details.   *
+; ***************************************************************************
+
+#ifndef AQH_AVR_NETWORK_MSG_GENREF_D_ASM
+#define AQH_AVR_NETWORK_MSG_GENREF_D_ASM
+
+
+.equ NETMSG_GENREF_OFFS_UID       = NETMSG_OFFS_PAYLOAD
+.equ NETMSG_GENREF_OFFS_MSGID     = NETMSG_OFFS_PAYLOAD+4
+.equ NETMSG_GENREF_OFFS_VALUE     = NETMSG_OFFS_PAYLOAD+6  ; 0 to 4 bytes
+.equ NETMSG_GENREF_SIZE0          = NETMSG_OFFS_PAYLOAD+6  ; size for  empty value without CRC byte
+.equ NETMSG_GENREF_SIZE8          = NETMSG_OFFS_PAYLOAD+7  ; size for  8 bit value without CRC byte
+.equ NETMSG_GENREF_SIZE16         = NETMSG_OFFS_PAYLOAD+8  ; size for 16 bit value without CRC byte
+.equ NETMSG_GENREF_SIZE32         = NETMSG_OFFS_PAYLOAD+10 ; size for 32 bit value without CRC byte
+
+
+#endif
+