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_src[0] consists of a 4 digit "MODEL_ID", in the example 0363 which defines the equipment type sending the data. The rest of the string is a unique identifier which defines the individual piece of equipment. Typically, the unique identifier is a serial number or MAC address. It is essential that this device_id be unique (within Open Kitchen) and properly provisioned. If the equipment requires this id to be manually entered by a technician or factory personnel, it must be entered before connecting to Open Kitchen.
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