The energy-harvesting node relays information to the sink node in the form of set message types. Messages are sent using the RF link to the sink node containing the following information:
• Sensor readings from the sensor modules attached to the energy-harvesting node and to the remote nodes: The sensor messages contain the source of the measurement, the measured value, and the message priority level for the message.
• Energy multiplexer module changes: These messages contain details of modules added or removed from the energy multiplexer subsystem presented as
module type and physical location on the energy multiplexer subsystem and whether it has been added or removed.
• Energy module readings: These messages contain the current energy production rate in the case of harvesting modules or, in the case of storage modules, the amount of energy currently stored, and the physical location on the energy multiplexer subsystem to which the reported module is connected.