The present disclosure relates to a personal computing device configured to provide a sensor hierarchy for a subscriber comprising: a sensor module, configured to receive or retrieve values from a sensor; a memory module, configured to store data indicative of a sensor hierarchy, wherein the sensor hierarchy comprises a plurality of nodes wherein each node comprises at least one hierarchical identifier and at least one node comprises data indicative of the sensor module; and a sensor hierarchy module, configured to: obtain the data indicative of the sensor hierarchy from the memory module; receive a subscription request from the subscriber, wherein preferably the subscription request comprises data indicative of the hierarchical identifier to subscribe to; optionally locate the hierarchical identifier of the subscription request within the sensor hierarchy; and subscribe the subscriber based on the subscription request.