Each device (in particular the sensors such as keyboards, pedals...) need to store parameters in either battery-backed up SRAM or EEPROM (for example). All active devices (those that do not affect the stream) should be able to answer the -3 Label and -4 Serial messages with the proper UTF-8 payload.

• The Serial is a guaranteed unique string that is used by DAW for example, under the hood. It is not meant to be user-editable, and it's stored by the manufacturer in the firmware for example. It is a free-form UTF-8 string that describe the manufacturer, model, revision, serial number, date of manufacture...
• The Label is a user-editable and performance-dependent UTF-8 string with a short description of the device in the context of the current n00n stream: "left keyboard" "pedal 1" "mixer"... This should be stored in the device and can be edited directly or through commands sent by a DAW.
• The last 16-bit address/ID should also be stored in non-volatile memory to preserve known-good values. Even better, the last 3 valid addresses are stored, for convenience and quick recovery if the device goes back and forth from one environment to another.
• More values may need to be stored. For example, a keyboard needs calibration values for min and max positions of the keys or the analog wheel, or the current transposition.

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(note : the Serial string can be used as a seed to generate the candidate 16-bit IDs)