Automation system

A method for controlling an environment in a region of a building, the building comprising a building system, the method comprising:

• observing, at a receiver, a wireless signal, over a network to which the receiver does not belong, from an electronic device in a region of the building, the observed wireless signal comprising header information;
• determining whether the observed wireless signal satisfies a predetermined control criterion in dependence on the header information, wherein a determination that the predetermined control criterion is satisfied indicates occupancy or use of a region of the building;
• and
• changing a state of the building system in dependence on the determination that the control criterion is satisfied, thereby indicating occupancy or use of the region of the building.

A non-transitory computer readable storage medium having stored thereon computer readable instructions that, when executed at a computer system, cause the computer system to:

• observe, at a receiver, a wireless signal, over a network to which the receiver does not belong, from an electronic device in a region of the building, the observed wireless signal comprising header information;
• determine whether the observed wireless signal satisfies a predetermined control criterion in dependence on the header information, wherein a determination that the predetermined control criterion is satisfied indicates occupancy or use of the region of the building;
• and
• change a state of a building system in dependence on the determination that the control criterion is satisfied, thereby indicating occupancy or use of the region of the building.