Monitoring the status of a wall switch

I need to monitor the position of a simple wall SPDT switch, without removing the panel or meddling with high voltage. I'm thinking of a sensor which could be kept close to the switch, such that it can be used normally without intervention. A proximity sensor which would give different values for an on and off switch respectively, perhaps?
Or a small magnetic strip on the switch ?

This project is for monitoring the status of an energy hungry device. And such devices usually have a light indicator .
So for now, I'm using that as my indicator of switch status with an LDR.
More elegant solutions are welcome :slight_smile:

Thanks in advance :slight_smile:

Have you looked into Moteino?