The solutions discussed in http://forum.mysensors.org/topic/3257/simple-detector-that-detects-breaking-of-a-line/ might be something you can use?

Hi torehc vcc (3.04v)-----arduino RAW pin gnd------arduino GND NRF vcc-----arduino VCC (regulated 3.3 in my case) If you have problem with route i suppose it is a problem with your power supply. NRF seems to be really erratic. Also you must add a capacitor on nrf too.

I thought i was using the latest 1.5 version but it seems not. Uploading all my sketches with fresh downloaded version fixed my pb. Thx sundberg84 ;)

Thank you Tang, works perfekt now

Ok thanks for the precision ;-)

@Tang It's usable with the dev-branch of the vera plugin (small changes in behavior and enumeration of internal commands which probably will mess things up in the agocontrol plugin). ***General comment: I cannot give any support on development-branch as it is under development and things might change fast and without any notice. ***