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Used in: ServiceDiscoveryResponse
optional string make = 1
optional string model = 2
optional string year = 3
optional string vehicle_id = 4
optional string head_unit_make = 5
optional string head_unit_model = 6
optional string head_unit_software_build = 7
optional string head_unit_software_version = 8
Used in: ServiceDiscoveryRequest
optional string instance_id = 1
optional string connectivity_lifetime_id = 2