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Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   Service Discovery Protocol
   SDP
      <protocol> (SDP) A Bluetooth protocol in the Core
    Protocol Stack that allows devices to connect to
      other services.
      Bluetooth SDP
    (http://bluetooth.org/assigned-numbers/sdp.htm).
      (2002-06-28)