A building sensor node of a sensor network system, wherein the sensor node includes one or more memory devices configured to store instructions thereon, that, when executed by one or more processors, cause the one or more processors to execute a first function to provide a first functionality, wherein the first function is associated with a next function identifier of a next function. The instructions further cause the one or more processors to transition between a number of states of a state machine based on the next function identifier, verify execution of the next function by comparing the next function identifier to a table of allowed transitions receive an additional function from a server, and update the sensor node to provide a second functionality to the sensor node without rebooting the sensor node based on the additional function received from the server.