SmpCmdNotImplementedError: ""

[jsmif]

sudo bluing le --pairing-feature --addr-type=random C7:9D:DA:A3:80:01
[INFO] Requesting pairing feature of C7:9D:DA:A3:80:01 on hci0
Requesting ✖
[ERROR] bluing.le.le_scan
        SmpCmdNotImplementedError: ""

Does this mean that the pairing-feature scan is a command that's not implemented? Or that something broke within the command?

FWIW a tshark dump of the Sniffle log of the transaction looks like this:

./sniff_receiver.py -H -s /dev/ttyACM1 -o test.pcap -m C7:9D:DA:A3:80:01
...
tshark -r test.pcap 
    1   0.000000 c7:9d:da:a3:80:01 → Broadcast    LE LL 33 ADV_IND
    2   2.006371 c7:9d:da:a3:80:01 → Broadcast    LE LL 33 ADV_IND
    3   4.012469 c7:9d:da:a3:80:01 → Broadcast    LE LL 33 ADV_IND
    4   6.016232 c7:9d:da:a3:80:01 → Broadcast    LE LL 33 ADV_IND
    5   8.021018 c7:9d:da:a3:80:01 → Broadcast    LE LL 33 ADV_IND
    6   8.022050 SenaTech_7d:ef:92 → c7:9d:da:a3:80:01 LE LL 53 CONNECT_IND
    7   8.032364 Master_0x24bd7eeb → Slave_0x24bd7eeb LE LL 19 Empty PDU
    8   8.032594 Slave_0x24bd7eeb → Master_0x24bd7eeb LE LL 19 Empty PDU
    9   8.102366 Master_0x24bd7eeb → Slave_0x24bd7eeb SMP 30 Sent Pairing Request: AuthReq: No Bonding, SecureConnection | Initiator Key(s): LTK, IRK, CSRK, Linkkey | Responder Key(s): LTK, IRK, CSRK, Linkkey
   10   8.102684 Slave_0x24bd7eeb → Master_0x24bd7eeb LE LL 28 Control Opcode: LL_LENGTH_REQ
   11   8.172367 Master_0x24bd7eeb → Slave_0x24bd7eeb LE LL 21 Control Opcode: LL_UNKNOWN_RSP
   12   8.172614 Slave_0x24bd7eeb → Master_0x24bd7eeb SMP 25 Rcvd Pairing Failed: Pairing Not Supported
   13   8.242369 Master_0x24bd7eeb → Slave_0x24bd7eeb LE LL 21 Control Opcode: LL_TERMINATE_IND
   14   8.252626 c7:9d:da:a3:80:01 → Broadcast    LE LL 33 ADV_IND
   15  10.260517 c7:9d:da:a3:80:01 → Broadcast    LE LL 33 ADV_IND

Also FWIW the target was probably an iPhone or some other Apple device:

Addr:        C7:9D:DA:A3:80:01 
Addr type:   random
Connectable: True
RSSI:        -50 dBm
General Access Profile:
    Manufacturer Specific Data: 
        Company ID: 0x004C (Apple, Inc.)
        Data:       12025401

So I don't know that the command was supposed to work, but I just want to understand the error message for future.