2.2.1.1.1.2.3 Device ID

The device ID is specified by the device-id-spec ABNF rule portion of the plain text query value. The value, represented by the device-id ABNF rule, is a string that specifies the device. Each device MUST have a unique device ID string. The device ID string MUST NOT contain commas or special characters. Each request from the device MUST include the same device ID string.