# Properties This page describes the "property request" mechanism, as well as the message format used to interact with it. ### Message Format All messages on this endpoint are CBOR encoded. #### Requests Requests are maps, with one or more of the following keys: - get: An array of property IDs to read - set: A map containing properties to set. Keys in the map correspond to property IDs. #### Replies The device responds with a map, which contains the following keys. Which keys are included in the response depends on the request: - get: A map (keyed by property IDs) containing the value of all requested properties. Unsupported/unknown properties are returned as `undefined`. - set: An array containing the property IDs of all properties that were set. Any properties that were requested to be set, but are not supported (or read-only) will not be included. ### Supported Properties Below are all currently supported properties, including their IDs and value types:

ID	Name	R/W	Type	Description
`0x01`	HwSerial	R	string	Serial number of the hardware
`0x02`	HwVersion	R	string	Version information (such as revision) for the device
`0x03`	HwInventory	R	array	Information about all peripherals connected to the load. The array contains maps, which will have the following keys: - type: Peripheral type; may be one of \["load", "hmi" or "io"\] - sn: Serial number (string; optional) - driver: Driver id (blob; optional)
`0x04`	SwVersion	R	string	Current software version (including build number)
`0x05`	MaxVoltage	R	int	Maximum allowable input voltage (mV)
`0x06`	MaxCurrent	R	int	Maximum allowable input current (mA)
`0x07`	DefaultVSense	RW	int	Voltage sense source on power-on: - -1 = state at last power off - 0 = internal - 1 = external This setting is persistent.
`0x08`	DefaultMode	RW	int	Operation mode on power-on: - -1 = mode at last power off - 0 = Constant current - 1 = Constant voltage - 2 = Constant wattage This setting is persistent.
`0x09`	DefaultCurrent	RW	int	Current limit value (for constant current mode) to apply on power on, in mA. -1 = last user specified value at power off
`0x0A`	DefaultVoltage	RW	int	Voltage limit value (for constant voltage mode) to apply at power on, in mV. -1 = last user specified value at power off
`0x0B`	DefaultWattage	RW	int	Wattage (for constant wattage mode) to apply at power on, in mW. -1 = last user specified value at power off