| CPC H04L 45/74 (2013.01) [G06F 3/162 (2013.01); H04B 3/542 (2013.01); H04R 1/1025 (2013.01); H04R 1/1041 (2013.01); H04R 2420/07 (2013.01)] | 20 Claims |

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1. A first mobile device comprising:
first charging terminals;
a power line communication modem configured to supply power to a second mobile device connected with the first charging terminals and to perform data communication with the second mobile device, wherein the data communication includes a plurality of data packets; and
a microcontroller unit configured to generate primary data including a first data packet among the plurality of data packets, wherein the first data packet includes a first header and a first data message,
wherein the first header includes a first code indicating a purpose for the first data packet, and the first data message includes upper bits indicating a destination for data and lower bits indicating a number of data packets included in a first group in the data.
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