diff --git a/avr/devices/t03/0BUILD b/avr/devices/t03/0BUILD
index dc4c439..b004c20 100644
--- a/avr/devices/t03/0BUILD
+++ b/avr/devices/t03/0BUILD
@@ -5,6 +5,7 @@
   <subdirs>
     boot
     main
+    test
   </subdirs>
 
   <extradist>
diff --git a/avr/devices/t03/test/0BUILD b/avr/devices/t03/test/0BUILD
new file mode 100644
index 0000000..2ee4b03
--- /dev/null
+++ b/avr/devices/t03/test/0BUILD
@@ -0,0 +1,33 @@
+<?xml?>
+
+<gwbuild>
+
+  <target type="AvrHexFile" name="t03_test" >
+
+    <includes type="avrasm" >
+      -I $(builddir)
+      -I $(srcdir)
+      -I $(topsrcdir)/avr
+      -I $(topbuilddir)/avr
+    </includes>
+
+
+    <sources type="avrasm" >
+      main.asm
+    </sources>
+
+
+  </target>
+
+
+
+  <subdirs>
+  </subdirs>
+
+  <extradist>
+  </extradist>
+  
+
+</gwbuild>
+
+
diff --git a/avr/devices/t03/test/main.asm b/avr/devices/t03/test/main.asm
new file mode 100644
index 0000000..ab5794a
--- /dev/null
+++ b/avr/devices/t03/test/main.asm
@@ -0,0 +1,366 @@
+; ***************************************************************************
+; copyright   : (C) 2024 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.   *
+; ***************************************************************************
+
+
+
+
+; ***************************************************************************
+; Source file for temperature sensor node on AtTiny 84
+;
+; This is for the full system (i.e. not the boot loader).
+;
+; All definitions and changes should go into this file.
+;
+;
+; ***************************************************************************
+
+
+;.equ clock=1000000 ; Define the clock frequency
+.equ clock=8000000 ; Define the clock frequency
+
+
+.nolist
+.include "include/tn841def.inc" ; Define device ATtiny841
+.list
+
+.include "../defs.asm"
+.include "version.asm"
+;.include "defs_all.asm"
+
+.include "devices/all/defs.asm"
+
+.include "common/calls.asm"
+.include "common/utils_wait.asm"
+.include "common/utils_io.asm"
+
+
+
+; ***************************************************************************
+; defines
+
+; ---------------------------------------------------------------------------
+; generic
+
+.equ COMONUART0_IFACENUM = 1
+.equ TTYONUART1_IFACENUM = 2
+
+
+; ---------------------------------------------------------------------------
+; firmware settings including list of modules used
+
+
+#define MAIN_WITHOUT_MSG_HANDLING ; we do message handling ourselfes
+#define APP_STATS_NETDEV2
+
+#define MODULES_CLOCK
+;#define MODULES_COM
+;#define MODULES_COM_WITH_ADDR_PROTO
+;#define MODULES_LED
+#define MODULES_LED_SIMPLE
+;#define MODULES_TWI_MASTER
+;#define MODULES_LCD
+;#define LCD_MINIMAL_FONT
+;#define MODULES_SI7021
+;#define MODULES_STATS
+;#define MODULES_CNY70
+;#define MODULES_REED
+;#define MODULES_OWI_MASTER
+;#define MODULES_DS18B20
+;#define MODULES_MOTION
+#define MODULES_NETWORK
+#define MODULES_COM2W0
+;#define MODULES_COMONUART0
+#define MODULES_TTYONUART1
+#define APPS_STATS
+#define APPS_NETWORK
+
+
+
+.equ NET_BUFFERS_NUM           = 10
+
+.equ UART_HW_MSGNUMINBUF_SIZE  = 8
+.equ UART_HW_MSGNUMOUTBUF_SIZE = 8
+
+
+
+; ---------------------------------------------------------------------------
+; defines for values
+
+.equ VALUE_ID_DS18B20_TEMP     = 0x06
+
+.equ VALUE_ID_LEDSIMPLE_TIMING = 0x88
+
+
+
+.equ COM_DATA0_DDR      = COM_DATA_DDR
+.equ COM_DATA0_INPUT    = COM_DATA_INPUT
+.equ COM_DATA0_OUTPUT   = COM_DATA_OUTPUT
+.equ COM_DATA0_PUE      = COM_DATA_PUE
+.equ COM_DATA0_PIN      = COM_DATA_PIN
+
+.equ COM_CLK0_DDR       = COM_CLK_DDR
+.equ COM_CLK0_INPUT     = COM_CLK_INPUT
+.equ COM_CLK0_OUTPUT    = COM_CLK_OUTPUT
+.equ COM_CLK0_PUE       = COM_CLK_PUE
+.equ COM_CLK0_PIN       = COM_CLK_PIN
+
+.equ COM_IRQ_ADDR_CLK0  = COM_IRQ_ADDR_CLK
+.equ COM_IRQ_BIT_CLK0   = COM_IRQ_BIT_CLK
+.equ COM_IRQ_GIFR_CLK0  = COM_IRQ_GIFR_CLK
+.equ COM_IRQ_GIMSK_CLK0 = COM_IRQ_GIMSK_CLK
+
+
+; ***************************************************************************
+; code segment
+
+.cseg
+.org 000000
+
+
+
+; ---------------------------------------------------------------------------
+; Reset and interrupt vectors
+
+        rjmp BOOTLOADER_ADDR          ;  1: RESET             Reset vector  use this for flashed system
+	reti                          ;  2: INT0              External Interrupt Request 0
+        rjmp COM2W0_ClkChangeIsr      ;  3: PCINT0            Pin Change Interrupt 0
+	reti                          ;  4: PCINT1            Pin Change Interrupt 1
+	reti                          ;  5: WDT               Watchdog Time-out
+	reti                          ;  6: TIM1_CAPT         Timer/Counter1 Capture Event
+	reti                          ;  7: TIM1_COMPA (OC1A) Timer/Counter1 Compare Match A
+	reti                          ;  8: TIM1_COMPB (OC1B) Timer/Counter1 Compare Match B
+	reti                          ;  9: TIM1_OVF (OVF1)   Timer/Counter1 Overflow
+        rjmp baseTimerIrqOC0A         ; 10: TIM0_COMPA (OC0A) Timer/Counter0 Compare Match A
+	reti                          ; 11: TIM0_COMPB (OC0B) Timer/Counter0 Compare Match B
+	reti                          ; 12: TIM0_OVF (OVF0)   Timer/Counter0 Overflow
+	reti                          ; 13: ANA_COMP0         Analog Comparator 0
+        reti                          ; 14: ADC_READY         ADC Conversion Complete
+        reti                          ; 15: EE_RDY (ERDY)     EEPROM Ready
+        reti                          ; 16: ANA_COMP1         Analog Comparator 1
+        reti                          ; 17: TIM2_CAPT         Timer/Counter2 Capture Event
+        reti                          ; 18: TIM2_COMPA (OC2A) Timer/Counter2 Compare Match A
+        reti                          ; 19: TIM2_COMPB (OC2B) Timer/Counter2 Compare Match B
+        reti                          ; 20: TIM2_OVF (OVF2)   Timer/Counter2 Overflow
+        reti                          ; 21: SPI               SPI Serial Transfer Complete
+        reti                          ; 22: USART0_RXS        USART0 Rx Start
+;        rjmp ComOnUart0_RxCharIsr     ; 23: USART0_RXC        USART0 Rx Complete
+        reti                          ; 23: USART0_RXC        USART0 Rx Complete
+        reti                          ; 24: USART0_DRE        USART0 Data Register Empty
+        reti                          ; 25: USART0_TXC        USART0 Tx Complete
+        reti                          ; 26: USART1_RXS        USART1 Rx Start
+        rjmp TtyOnUart1_RxCharIsr     ; 27: USART1_RXC        USART1 Rx Complete
+        rjmp TtyOnUart1_TxUdreIsr     ; 28: USART1_DRE        USART1 Data Register Empty
+        rjmp TtyOnUart1_TxCharIsr     ; 29: USART1_TXC        USART1 Tx Complete
+        reti                          ; 30: TWI               Two-Wire-Interface
+        reti                          ; 31: RESERVED          reserved
+
+
+
+devInfoBlock:        ; 12 bytes
+devInfoManufacturer: .db 'A', 'Q', 'U', 'A'
+devInfoId:           .db DEVICEINFO_ID, 0
+devInfoVersion:      .db DEVICEINFO_VERSION, DEVICEINFO_REVISION             ; version, revision
+firmwareVersion:     .db FIRMWARE_VARIANT_TEMP_WINDOW, FIRMWARE_VERSION_MAJOR
+                     .db FIRMWARE_VERSION_MINOR, FIRMWARE_VERSION_PATCHLEVEL
+
+
+
+; ---------------------------------------------------------------------------
+; @routine firmwareStart @global
+
+firmwareStart:
+  rjmp main
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine onSystemStart
+
+onSystemStart:
+  ; set interface number for UART0
+  ldi r16, COMONUART0_IFACENUM
+  sts netInterfaceData2+NET_IFACE_OFFS_IFACENUM, r16
+  ; set interface number for UART1
+  ldi r16, TTYONUART1_IFACENUM
+  sts ttyOnUart1_iface+NET_IFACE_OFFS_IFACENUM, r16
+  
+  ret
+; @end
+
+
+
+onEvery100ms:
+onEverySecond:
+onEveryMinute:
+onEveryHour:
+onEveryDay:
+  ret
+
+
+
+; ---------------------------------------------------------------------------
+; @routine onEveryLoop
+;
+; Called on every loop (i.e. after awakening from sleep).
+
+onEveryLoop:
+  rcall checkRecvdMsg
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine onMessageReceived
+;
+; Called on every message received
+
+onMessageReceived:
+  clc
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine checkRecvdMsg
+;
+; Read messages from either interface and forward to the other one.
+
+checkRecvdMsg:
+    rcall NET_PeekNextIncomingMsgNum          ; check read queue (bufNum->r16)
+    brcc checkRecvdMsg_end                    ; no msg, jmp
+    rcall NET_Buffer_Locate                   ; (R17)
+    ; let system handle incoming messages
+    push r16
+      push xl
+        push xh
+          adiw xh:xl, 1
+          rcall letSysHandleMsg
+        pop xh
+      pop xl
+    pop r16
+
+    ; forward to other interface
+    ld r17, X
+    andi r17, (1<<NET_IFACE_BUFFER_IFACENUM1_BIT) | (1<<NET_IFACE_BUFFER_IFACENUM0_BIT)
+    rcall reverseInterfaceNum                 ; (R17)
+;    ldi r17, TTYONUART1_IFACENUM ; DEBUG: send everything to uart1 to test that code first
+    rcall addMsgToInterface
+    brcc checkRecvdMsg_end                    ; could not add, jmp
+    rcall NET_GetNextIncomingMsgNum           ; take off the queue
+  rjmp checkRecvdMsg
+checkRecvdMsg_end:
+  ret
+; @end
+
+
+
+letSysHandleMsg:
+  ld r16, X
+  cpi r16, 0xff
+  breq letSysHandleMsg_forMe
+  lds r17, netInterfaceData2+NET_IFACE_OFFS_ADDRESS
+  cp r16, r17
+  brne letSysHandleMsg_end
+letSysHandleMsg_forMe:
+  push xl
+    push xh
+      rcall onMessageReceived
+    pop xh
+  pop xl
+  push xl
+    push xh
+      rcall mainModulesOnPacketReceived
+    pop xh
+  pop xl
+  push xl
+    push xh
+      rcall mainAppsOnPacketReceived
+    pop xh
+  pop xl
+letSysHandleMsg_end:
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine reverseInterfaceNum
+;
+; @param r17 buffer num
+; @return r17 reversed interface number
+; @clobbers r17
+
+reverseInterfaceNum:
+  andi r17, (1<<NET_IFACE_BUFFER_IFACENUM1_BIT) | (1<<NET_IFACE_BUFFER_IFACENUM0_BIT)
+  cpi r17, COMONUART0_IFACENUM
+  brne reverseInterfaceNum_notUart0
+  ldi r17, TTYONUART1_IFACENUM
+  ret
+reverseInterfaceNum_notUart0:
+  ldi r17, COMONUART0_IFACENUM
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine addMsgToInterface
+; @param r16 buffer num
+; @param r17 interface num
+
+addMsgToInterface:
+  cpi r17, COMONUART0_IFACENUM
+  breq addMsgToInterface_toUart0
+  cpi r17, TTYONUART1_IFACENUM
+  breq addMsgToInterface_toUart1
+  clc
+  ret
+addMsgToInterface_toUart0:
+  ldi yl, LOW(netInterfaceData2)
+  ldi yh, HIGH(netInterfaceData2)
+  rjmp NET_Interface_AddOutgoingMsgNum     ; try to add msg to interface
+addMsgToInterface_toUart1:
+  ldi yl, LOW(ttyOnUart1_iface)
+  ldi yh, HIGH(ttyOnUart1_iface)
+  rjmp NET_Interface_AddOutgoingMsgNum     ; try to add msg to interface
+; @end
+
+
+
+
+
+
+; ***************************************************************************
+; includes
+
+.include "devices/all/hw_tn841.asm"
+.include "devices/all/includes.asm"
+.include "common/debug.asm"
+
+
+
+
+; ---------------------------------------------------------------------------
+; defines for network interface
+
+.equ netInterfaceData  = ttyOnUart1_iface
+;.equ netInterfaceData2 = comOnUart0_iface
+.equ netInterfaceData2 = com2w0_iface
+
+
+; debug
+push r18
+  push r19
+    rcall LedSimple_SetFastTiming
+  pop r19
+pop r18
+