Flags indicate the state of the connection. destination hostname or IP, and port number ( 10.0.1).the source hostname or IP, and port number ( 10.0.0.50.80).It prints one line for each packet, and command keeps running until you press Ctrl+C to terminate. Tcpdump allows you to examine the headers of the TCP/IP packets. It is a good idea to run this tool occasionally to keep a watch over your network. The packets can be saved to a file and later analyzed. The tcpdump tool can be of great help when resolving networking issues. It is an industry-standard for capturing and analyzing TCP/IP packets. Either this contains the Bluetooth log file directly (search for a btsnoop_hci.log), or the full path of the log file (grep the bug report for btsnoop_hci.Tcpdump is an amazing command-line tool for network sniffing. Run adb bugreport bugreport.out to create a bug report ZIP file.Run adb root to gain root-level access to the phone.Connect to the phone via USB debugging with adb.Enable "Bluetooth HCI snoop log" in the Android developer options.Unfortunately, the location of this log file changes between Android versions, and access seems to require root in recent versions. This is similar to creating a tcpdump of TCP/IP traffic, just for Bluetooth. The setup couldn't be simpler: connect the phone to the computer via USB, enable USB debugging, select the "Android Bluetooth" capture source in Wireshark, and start recording!Īndroid also has a function to log all traffic into a file, which can later be copied to a computer for analysis in Wireshark. Helpfully, newer versions of Wireshark include an androiddump utility to capture Bluetooth traffic directly from Android phones. If this is not supported out of the box, recording the Bluetooth traffic is useful in order to create a custom tool. While many of them come with mobile apps for control and configuration, sometimes it's convenient to access them from a computer instead. Bluetooth devices have become ubiquitous, whether it's headphones, heart rate monitors, smart watches, or light bulbs.
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