I think I'm getting closer


Nokia-N810-23-14:~# hciconfig -a
hci0: Type: UART
BD Address: XXXXXXXX ACL MTU: 384:8 SCO MTU: 64:8
UP RUNNING PSCAN ISCAN
RX bytes:11221 acl:0 sco:0 events:270 errors:0
TX bytes:3539 acl:0 sco:0 commands:117 errors:0
Features: 0xbf 0xee 0x0f 0x46 0x98 0x19 0x00 0x00
Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV3
Link policy: RSWITCH HOLD SNIFF PARK
Link mode: SLAVE ACCEPT
Name: 'N810'
Class: 0x1005c0
Service Classes: Object Transfer
Device Class: Peripheral, Combo keyboard/pointing device
HCI Ver: 2.0 (0x3) HCI Rev: 0x6cc LMP Ver: 2.0 (0x3) LMP Subver: 0x6cc
Manufacturer: Cambridge Silicon Radio (10)

Looks like the N810 is advertising itself as a keyboard. Maybe this is a side effect of having Blue maemo installed in the past.