Hello. I'm very interested by your system to replace SWM301 with arduino nano and grey scale sensor. I'm new in arduino world and a little bit lost to succeed. I'm usine VERA as controller. Can you send me schematic for connexions of radio, grey scale sensor and the sketchs need to be included. I tried a serial gateway sketch, which seems to be uploaded but when I try to upload your sketch I have this error :

WARNING: Spurious .ci folder in 'MySensors' library
WARNING: Spurious .mystools folder in 'MySensors' library
In file included from /Users/patriceagnesmetairie1 1/Documents/Arduino/sketch_compteur_eau/sketch_compteur_eau.ino:20:0:
/Users/patriceagnesmetairie1 1/Documents/Arduino/libraries/MySensors-master/MySensors.h:405:2: error: #error No forward link or gateway feature activated. This means nowhere to send messages! Pretty pointless.
#error No forward link or gateway feature activated. This means nowhere to send messages! Pretty pointless.
^
exit status 1

can you help me ?
Thanks a lot
Patrice