Principal function and essential character tests place Espressif board and module under wireless communication classification.

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....Integrated Wi Fi and Bluetooth functionality determined the classification of both goods: the development board and the module were found to be embedded electronic assemblies whose principal function was wireless data transmission and reception, not automatic data processing or ADP parts. The board was held not to answer the description of an ADP machine, and the module was held not to be a part used solely or principally with ADP machines. Heading 8542 was also rejected because both goods were assembled modules on printed circuit boards, not bare integrated circuits. Both were classified under CTI 8517 62 90. The request to keep the ruling confidential for commercially sensitive information was allowed.....