Good atfernoon (or morning depending on your whereabouts)!<br><br>Working on my Master&#39;s I want to be able to delete, write and read the link keys associated with a paired device. I found the functions <br><br>int hci_read_stored_link_key(int dd, bdaddr_t *bdaddr, uint8_t all, int to)
<br>int hci_write_stored_link_key(int dd, bdaddr_t *bdaddr, uint8_t *key, int to)<br>int hci_delete_stored_link_key(int dd, bdaddr_t *bdaddr, uint8_t all, int to)<br><br>in hci.c and tried to use the delete-function. It seems to work, as the function call returns 0, indicating that no problems occured. However, the link key still appears in /var/libs/bluetooth/BD_ADDR/linkkeys, and a following authentication is still successfull. 
<br>Hcidump reports this:<br>&lt; HCI Command: Delete Stored Link Key (0x03|0x0012) plen 7<br>&nbsp;&nbsp;&nbsp; bdaddr 00:09:DD:60:02:45 all 0<br>&gt; HCI Event: Command Complete (0x0e) plen 4<br>&nbsp;&nbsp;&nbsp; Delete Stored Link Key (0x03|0x0012) ncmd 1
<br>&nbsp;&nbsp;&nbsp; status 0x11 deleted 2525<br>&nbsp;&nbsp;&nbsp; Error: Unsupported Feature or Parameter Value<br><br>I guess it might be the value of parameter &quot;all&quot;. I didn&#39;t know what it is, so I tried with 0 and 1 (apperently not correct). Anyone knows what this parameter of type uint8_t is for? I thought it might be like a &quot;boolean&quot; variable, instructing deletion of ALL the associated link keys. Am I far off?
<br><br>Another thing, about the hci_read_stored_link_key function. Is the key returned as an int-value or by some other means? I&#39;m a bit confused about this matter.. <br><br>Any reply will be valued greetly.<br><br>Regards,
<br>Staale A. Kleppe<br><br><br>