A building system for a building includes an environmental controller including a controller radio. The environmental controller is configured to communicate a wake-up message. The building system includes an environmental sensor including a wake-up radio and a main radio. The environmental sensor is configured to operate the main radio in a low power state. The environmental sensor is configured to receive the wake-up message from the controller radio via the wake-up radio. The environmental sensor is configured to operate the main radio in a high power state in response to a reception of the wake-up message via the wake-up radio. The environmental sensor is configured to communicate sensor data of the environmental sensor to the controller radio via the main radio in response to the main radio operating in the high power state.