When I run "hcidump -R", I see (among other output) lines like these, > 04 3E 26 02 01 03 01 69 57 93 F1 99 F8 1A 02 01 04 09 09 39 36 37 35 39 39 38 46 07 16 09 18 EB 03 00 FE 04 16 0F 18 3E A5 But trying every available option for "btmon", I can't find anything remotely similar. How can I get this information using "btmon"? Or can I -- does "btmon" show this type of information? Is there some other command that would be more appropriate? I understand that "hcidump" has been deprecated for several years. Yet the output of "btmon" seems to imply that it is calling "hcidump". That doesn't make sense to me. For example, @ RAW Open: hcidump (privileged) version 2.22 {0x0002} [hci0] 1.894682 @ RAW Open: hcidump (privileged) version 2.22 {0x0003} 1.894702 @ RAW Close: hcidump {0x0003} 1.894708 @ RAW Close: hcidump {0x0002} [hci0] 1.894718 My system is running Fedora 34 with these packages: bluez-5.62-2.fc34.x86_64 (includes /usr/bin/btmon) bluez-deprecated-5.62-2.fc34.x86_64 (includes /usr/bin/hcidump) bluez-hcidump-2.5-18.fc34.x86_64 (includes /usr/sbin/hcidump) -- Dave Close, Compata, Irvine CA "Curiosity is insubordination dave@xxxxxxxxxxx, +1 714 434 7359 in its purest form." dhclose@xxxxxxxxxxxxxxxxxx -- Vladimir Nabokov