obexftp -l fails, return code 81
I am currently attempting to use obex tools to browse (and later mount) the file system of an Android device (7.1.1). When I try to list using obexftp -l, it simply returns nothing. I have tried almost every possible combination of file parameters after -l, but still get the same error. My end goal is to use obexfs to mount, but feel this is an intermediate stepping stone. Details below.
uname -r: 3.14.2-xilinx
bluetoothd -v: 4.101
bluetoothctl -v 5.47
lsusb: Bus 001 Device 004: ID 0a5c:21e8 Broadcom Corp. BCM20702A0 Bluetooth 4.0
hcitool dev: hci0 5C:F3:70:82:XX:XX
hciconfig -a:
hci0: Type: BR/EDR Bus: USB
BD Address: 5C:F3:70:82:XX:XX ACL MTU: 1021:8 SCO MTU: 64:1
UP RUNNING PSCAN ISCAN
RX bytes:13146 acl:211 sco:0 events:382 errors:0
TX bytes:6265 acl:219 sco:0 commands:149 errors:0
Features: 0xbf 0xfe 0xcf 0xfe 0xdb 0xff 0x7b 0x87
Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
Link policy: RSWITCH SNIFF
Link mode: SLAVE ACCEPT
Name: '312_BT-0'
Class: 0x000100
Service Classes: Unspecified
Device Class: Computer, Uncategorized
HCI Version: 4.0 (0x6) Revision: 0x1000
LMP Version: 4.0 (0x6) Subversion: 0x220e
Manufacturer: Broadcom Corporation (15)
Succesful file push from Linux device to Android device:
obexftp -b D4:63:C6:XX:XX:XX -B 6 -U none -p /home/root/test.txt
Suppressing FBS.
Connecting..\done
Sending "/home/root/test.txt".../done
Disconnecting..-done
Attempting to list file structure on Android device:
obexftp -b D4:63:C6:XX:XX:XX -B 6 -U none -l
Suppressing FBS.
Connecting..\done
Receiving "(null)"...|failed: (null)
The operation failed with return code 81
Disconnecting../done
Output of btmon when attempting above obexftp -l command:
= New Index: 5C:F3:70:82:XX:XX (Primary,USB,hci0) [hci0] 0.316536
< HCI Command: Create Connection (0x01|0x0005) plen 13 #1 [hci0] 3.563946
Address: D4:63:C6:XX:XX:XX (OUI D4-63-C6)
Packet type: 0xcc18
DM1 may be used
DH1 may be used
DM3 may be used
DH3 may be used
DM5 may be used
DH5 may be used
Page scan repetition mode: R2 (0x02)
Page scan mode: Mandatory (0x00)
Clock offset: 0x0000
Role switch: Allow slave (0x01)
> HCI Event: Command Status (0x0f) plen 4 #2 [hci0] 3.565628
Create Connection (0x01|0x0005) ncmd 1
Status: Success (0x00)
> HCI Event: Role Change (0x12) plen 8 #3 [hci0] 5.392513
Status: Success (0x00)
Address: D4:63:C6:XX:XX:XX (OUI D4-63-C6)
Role: Slave (0x01)
> HCI Event: Connect Complete (0x03) plen 11 #4 [hci0] 5.414518
Status: Success (0x00)
Handle: 11
Address: D4:63:C6:XX:XX:XX (OUI D4-63-C6)
Link type: ACL (0x01)
Encryption: Disabled (0x00)
< HCI Command: Read Remote Supported Features (0x01|0x001b) plen 2 #5 [hci0] 5.414709
Handle: 11
> HCI Event: Command Status (0x0f) plen 4 #6 [hci0] 5.415523
Read Remote Supported Features (0x01|0x001b) ncmd 1
Status: Success (0x00)
> HCI Event: Max Slots Change (0x1b) plen 3 #7 [hci0] 5.425523
Handle: 11
Max slots: 5
> HCI Event: Link Supervision Timeout Changed (0x38) plen 4 #8 [hci0] 5.429522
Handle: 11
Timeout: 5000.000 msec (0x1f40)
> ACL Data RX: Handle 11 flags 0x02 dlen 10 #9 [hci0] 5.432524
L2CAP: Information Request (0x0a) ident 2 len 2
Type: Extended features supported (0x0002)
< ACL Data TX: Handle 11 flags 0x00 dlen 16 #10 [hci0] 5.432580
L2CAP: Information Response (0x0b) ident 2 len 8
Type: Extended features supported (0x0002)
Result: Success (0x0000)
Features: 0x000002b8
Enhanced Retransmission Mode
Streaming Mode
FCS Option
Fixed Channels
Unicast Connectionless Data Reception
> HCI Event: Read Remote Supported Features (0x0b) plen 11 #11 [hci0] 5.438528
Status: Success (0x00)
Handle: 11
Features: 0xff 0xfe 0x8f 0xfe 0xd8 0x3f 0x5b 0x87
3 slot packets
5 slot packets
Encryption
Slot offset
Timing accuracy
Role switch
Hold mode
Sniff mode
Power control requests
Channel quality driven data rate (CQDDR)
SCO link
HV2 packets
HV3 packets
u-law log synchronous data
A-law log synchronous data
CVSD synchronous data
Paging parameter negotiation
Power control
Transparent synchronous data
Broadcast Encryption
Enhanced Data Rate ACL 2 Mbps mode
Enhanced Data Rate ACL 3 Mbps mode
Enhanced inquiry scan
Interlaced inquiry scan
Interlaced page scan
RSSI with inquiry results
Extended SCO link (EV3 packets)
AFH capable slave
AFH classification slave
LE Supported (Controller)
3-slot Enhanced Data Rate ACL packets
5-slot Enhanced Data Rate ACL packets
Sniff subrating
Pause encryption
AFH capable master
AFH classification master
Enhanced Data Rate eSCO 2 Mbps mode
Extended Inquiry Response
Simultaneous LE and BR/EDR (Controller)
Secure Simple Pairing
Encapsulated PDU
Non-flushable Packet Boundary Flag
Link Supervision Timeout Changed Event
Inquiry TX Power Level
Enhanced Power Control
Extended features
< HCI Command: Read Remote Extended Features (0x01|0x001c) plen 3 #12 [hci0] 5.438569
Handle: 11
Page: 1
> ACL Data RX: Handle 11 flags 0x02 dlen 10 #13 [hci0] 5.438782
L2CAP: Information Request (0x0a) ident 3 len 2
Type: Fixed channels supported (0x0003)
< ACL Data TX: Handle 11 flags 0x00 dlen 20 #14 [hci0] 5.438818
L2CAP: Information Response (0x0b) ident 3 len 12
Type: Fixed channels supported (0x0003)
Result: Success (0x0000)
Channels: 0x0000000000000006
L2CAP Signaling (BR/EDR)
Connectionless reception
> HCI Event: Command Status (0x0f) plen 4 #15 [hci0] 5.440527
Read Remote Extended Features (0x01|0x001c) ncmd 1
Status: Success (0x00)
> HCI Event: Number of Completed Packets (0x13) plen 5 #16 [hci0] 5.443529
Num handles: 1
Handle: 11
Count: 2
> HCI Event: Read Remote Extended Features (0x23) plen 13 #17 [hci0] 5.444528
Status: Success (0x00)
Handle: 11
Page: 1/1
Features: 0x0f 0x00 0x00 0x00 0x00 0x00 0x00 0x00
Secure Simple Pairing (Host Support)
LE Supported (Host)
Simultaneous LE and BR/EDR (Host)
Secure Connections (Host Support)
< HCI Command: Remote Name Request (0x01|0x0019) plen 10 #18 [hci0] 5.444573
Address: D4:63:C6:XX:XX:XX (OUI D4-63-C6)
Page scan repetition mode: R2 (0x02)
Page scan mode: Mandatory (0x00)
Clock offset: 0x0000
> HCI Event: Command Status (0x0f) plen 4 #19 [hci0] 5.445529
Remote Name Request (0x01|0x0019) ncmd 1
Status: Success (0x00)
> HCI Event: Remote Name Req Complete (0x07) plen 255 #20 [hci0] 5.465535
Status: Success (0x00)
Address: D4:63:C6:XX:XX:XX (OUI D4-63-C6)
Name: Moto E (4)
< HCI Command: Authentication Requested (0x01|0x0011) plen 2 #21 [hci0] 5.465591
Handle: 11
Device Connected: D4:63:C6:XX:XX:XX (0) flags 0x0000
0b 09 4d 6f 74 6f 20 45 20 28 34 29 04 0d 0c 02 ..Moto E (4)....
5a Z
> HCI Event: Command Status (0x0f) plen 4 #22 [hci0] 5.466545
Authentication Requested (0x01|0x0011) ncmd 1
Status: Success (0x00)
> HCI Event: Link Key Request (0x17) plen 6 #23 [hci0] 5.467541
Address: D4:63:C6:XX:XX:XX (OUI D4-63-C6)
< HCI Command: Link Key Request Reply (0x01|0x000b) plen 22 #24 [hci0] 5.467588
Address: D4:63:C6:XX:XX:XX (OUI D4-63-C6)
Link key: b0912a0c42db7615860023aa911d552b
> HCI Event: Command Complete (0x0e) plen 10 #25 [hci0] 5.470540
Link Key Request Reply (0x01|0x000b) ncmd 1
Status: Success (0x00)
Address: D4:63:C6:XX:XX:XX (OUI D4-63-C6)
> HCI Event: Auth Complete (0x06) plen 3 #26 [hci0] 5.489555
Status: Success (0x00)
Handle: 11
< HCI Command: Set Connection Encryption (0x01|0x0013) plen 3 #27 [hci0] 5.489604
Handle: 11
Encryption: Enabled (0x01)
> HCI Event: Command Status (0x0f) plen 4 #28 [hci0] 5.490550
Set Connection Encryption (0x01|0x0013) ncmd 1
Status: Success (0x00)
> HCI Event: Encryption Change (0x08) plen 4 #29 [hci0] 5.532580
Status: Success (0x00)
Handle: 11
Encryption: Enabled with E0 (0x01)
< ACL Data TX: Handle 11 flags 0x00 dlen 10 #30 [hci0] 5.532645
L2CAP: Information Request (0x0a) ident 1 len 2
Type: Extended features supported (0x0002)
> ACL Data RX: Handle 11 flags 0x02 dlen 16 #31 [hci0] 5.562719
L2CAP: Information Response (0x0b) ident 1 len 8
Type: Extended features supported (0x0002)
Result: Success (0x0000)
Features: 0x000000b8
Enhanced Retransmission Mode
Streaming Mode
FCS Option
Fixed Channels
< ACL Data TX: Handle 11 flags 0x00 dlen 10 #32 [hci0] 5.562780
L2CAP: Information Request (0x0a) ident 2 len 2
Type: Fixed channels supported (0x0003)
> HCI Event: Number of Completed Packets (0x13) plen 5 #33 [hci0] 5.565591
Num handles: 1
Handle: 11
Count: 2
> ACL Data RX: Handle 11 flags 0x02 dlen 20 #34 [hci0] 5.566462
L2CAP: Information Response (0x0b) ident 2 len 12
Type: Fixed channels supported (0x0003)
Result: Success (0x0000)
Channels: 0x0000000000000082
L2CAP Signaling (BR/EDR)
Security Manager (BR/EDR)
< ACL Data TX: Handle 11 flags 0x00 dlen 12 #35 [hci0] 5.566511
L2CAP: Connection Request (0x02) ident 3 len 4
PSM: 3 (0x0003)
Source CID: 64
> ACL Data RX: Handle 11 flags 0x02 dlen 16 #36 [hci0] 5.570089
L2CAP: Connection Response (0x03) ident 3 len 8
Destination CID: 67
Source CID: 64
Result: Connection successful (0x0000)
Status: No further information available (0x0000)
< ACL Data TX: Handle 11 flags 0x00 dlen 27 #37 [hci0] 5.570138
L2CAP: Configure Request (0x04) ident 4 len 19
Destination CID: 67
Flags: 0x0000
Option: Maximum Transmission Unit (0x01) [mandatory]
MTU: 1013
Option: Retransmission and Flow Control (0x04) [mandatory]
Mode: Basic (0x00)
TX window size: 0
Max transmit: 0
Retransmission timeout: 0
Monitor timeout: 0
Maximum PDU size: 0
> ACL Data RX: Handle 11 flags 0x02 dlen 16 #38 [hci0] 5.571470
L2CAP: Configure Request (0x04) ident 4 len 8
Destination CID: 64
Flags: 0x0000
Option: Maximum Transmission Unit (0x01) [mandatory]
MTU: 1691
< ACL Data TX: Handle 11 flags 0x00 dlen 18 #39 [hci0] 5.571521
L2CAP: Configure Response (0x05) ident 4 len 10
Source CID: 67
Flags: 0x0000
Result: Success (0x0000)
Option: Maximum Transmission Unit (0x01) [mandatory]
MTU: 1691
> HCI Event: Number of Completed Packets (0x13) plen 5 #40 [hci0] 5.573594
Num handles: 1
Handle: 11
Count: 2
> ACL Data RX: Handle 11 flags 0x02 dlen 14 #41 [hci0] 5.573967
L2CAP: Configure Response (0x05) ident 4 len 6
Source CID: 64
Flags: 0x0000
Result: Success (0x0000)
< ACL Data TX: Handle 11 flags 0x00 dlen 8 #42 [hci0] 5.574064
Channel: 67 len 4 [PSM 3 mode 0] {chan 0}
RFCOMM: Set Async Balance Mode (SABM) (0x2f)
Address: 0x03 cr 1 dlci 0x00
Control: 0x3f poll/final 1
Length: 0
FCS: 0x1c
> HCI Event: Number of Completed Packets (0x13) plen 5 #43 [hci0] 5.577595
Num handles: 1
Handle: 11
Count: 2
> ACL Data RX: Handle 11 flags 0x02 dlen 8 #44 [hci0] 5.577612
Channel: 64 len 4 [PSM 3 mode 0] {chan 0}
RFCOMM: Unnumbered Ack (UA) (0x63)
Address: 0x03 cr 1 dlci 0x00
Control: 0x73 poll/final 1
Length: 0
FCS: 0xd7
< ACL Data TX: Handle 11 flags 0x00 dlen 18 #45 [hci0] 5.577681
Channel: 67 len 14 [PSM 3 mode 0] {chan 0}
RFCOMM: Unnumbered Info with Header Check (UIH) (0xef)
Address: 0x03 cr 1 dlci 0x00
Control: 0xef poll/final 0
Length: 10
FCS: 0x70
MCC Message type: DLC Parameter Negotiation CMD (0x20)
Length: 8
dlci 12 frame_type 0 credit_flow 15 pri 7
ack_timer 0 frame_size 1008 max_retrans 0 credits 7
> ACL Data RX: Handle 11 flags 0x02 dlen 18 #46 [hci0] 5.581473
Channel: 64 len 14 [PSM 3 mode 0] {chan 0}
RFCOMM: Unnumbered Info with Header Check (UIH) (0xef)
Address: 0x01 cr 0 dlci 0x00
Control: 0xef poll/final 0
Length: 10
FCS: 0xaa
MCC Message type: DLC Parameter Negotiation RSP (0x20)
Length: 8
dlci 12 frame_type 0 credit_flow 14 pri 7
ack_timer 0 frame_size 990 max_retrans 0 credits 7
< ACL Data TX: Handle 11 flags 0x00 dlen 8 #47 [hci0] 5.581541
Channel: 67 len 4 [PSM 3 mode 0] {chan 0}
RFCOMM: Set Async Balance Mode (SABM) (0x2f)
Address: 0x33 cr 1 dlci 0x0c
Control: 0x3f poll/final 1
Length: 0
FCS: 0x43
> HCI Event: Number of Completed Packets (0x13) plen 5 #48 [hci0] 5.584597
Num handles: 1
Handle: 11
Count: 2
> ACL Data RX: Handle 11 flags 0x02 dlen 8 #49 [hci0] 5.585096
Channel: 64 len 4 [PSM 3 mode 0] {chan 0}
RFCOMM: Unnumbered Ack (UA) (0x63)
Address: 0x33 cr 1 dlci 0x0c
Control: 0x73 poll/final 1
Length: 0
FCS: 0x88
< ACL Data TX: Handle 11 flags 0x00 dlen 12 #50 [hci0] 5.585552
Channel: 67 len 8 [PSM 3 mode 0] {chan 0}
RFCOMM: Unnumbered Info with Header Check (UIH) (0xef)
Address: 0x03 cr 1 dlci 0x00
Control: 0xef poll/final 0
Length: 4
FCS: 0x70
MCC Message type: Modem Status Command CMD (0x38)
Length: 2
dlci 12
fc 0 rtc 1 rtr 1 ic 0 dv 1
> ACL Data RX: Handle 11 flags 0x02 dlen 12 #51 [hci0] 5.591479
Channel: 64 len 8 [PSM 3 mode 0] {chan 0}
RFCOMM: Unnumbered Info with Header Check (UIH) (0xef)
Address: 0x01 cr 0 dlci 0x00
Control: 0xef poll/final 0
Length: 4
FCS: 0xaa
MCC Message type: Modem Status Command RSP (0x38)
Length: 2
dlci 12
fc 0 rtc 1 rtr 1 ic 0 dv 1
> ACL Data RX: Handle 11 flags 0x02 dlen 12 #52 [hci0] 5.592601
Channel: 64 len 8 [PSM 3 mode 0] {chan 0}
RFCOMM: Unnumbered Info with Header Check (UIH) (0xef)
Address: 0x01 cr 0 dlci 0x00
Control: 0xef poll/final 0
Length: 4
FCS: 0xaa
MCC Message type: Modem Status Command CMD (0x38)
Length: 2
dlci 12
fc 0 rtc 1 rtr 1 ic 0 dv 1
< ACL Data TX: Handle 11 flags 0x00 dlen 12 #53 [hci0] 5.592664
Channel: 67 len 8 [PSM 3 mode 0] {chan 0}
RFCOMM: Unnumbered Info with Header Check (UIH) (0xef)
Address: 0x03 cr 1 dlci 0x00
Control: 0xef poll/final 0
Length: 4
FCS: 0x70
MCC Message type: Modem Status Command RSP (0x38)
Length: 2
dlci 12
fc 0 rtc 1 rtr 1 ic 0 dv 1
< ACL Data TX: Handle 11 flags 0x00 dlen 9 #54 [hci0] 5.592678
Channel: 67 len 5 [PSM 3 mode 0] {chan 0}
RFCOMM: Unnumbered Info with Header Check (UIH) (0xef)
Address: 0x33 cr 1 dlci 0x0c
Control: 0xff poll/final 1
Length: 0
FCS: 0x53
Credits: 33
53 S
< ACL Data TX: Handle 11 flags 0x00 dlen 15 #55 [hci0] 5.592688
Channel: 67 len 11 [PSM 3 mode 0] {chan 0}
RFCOMM: Unnumbered Info with Header Check (UIH) (0xef)
Address: 0x33 cr 1 dlci 0x0c
Control: 0xef poll/final 0
Length: 7
FCS: 0x4f
80 00 07 10 00 04 00 4f .......O
> HCI Event: Number of Completed Packets (0x13) plen 5 #56 [hci0] 5.595604
Num handles: 1
Handle: 11
Count: 2
> HCI Event: Number of Completed Packets (0x13) plen 5 #57 [hci0] 5.598602
Num handles: 1
Handle: 11
Count: 2
> ACL Data RX: Handle 11 flags 0x02 dlen 21 #58 [hci0] 5.601479
Channel: 64 len 17 [PSM 3 mode 0] {chan 0}
RFCOMM: Unnumbered Info with Header Check (UIH) (0xef)
Address: 0x31 cr 0 dlci 0x0c
Control: 0xff poll/final 1
Length: 12
FCS: 0x89
Credits: 4
a0 00 0c 10 00 04 00 cb 00 00 00 01 89 .............
< ACL Data TX: Handle 11 flags 0x00 dlen 41 #59 [hci0] 5.601739
Channel: 67 len 37 [PSM 3 mode 0] {chan 0}
RFCOMM: Unnumbered Info with Header Check (UIH) (0xef)
Address: 0x33 cr 1 dlci 0x0c
Control: 0xef poll/final 0
Length: 33
FCS: 0x4f
83 00 21 cb 00 00 00 01 42 00 19 78 2d 6f 62 65 ..!.....B..x-obe
78 2f 66 6f 6c 64 65 72 2d 6c 69 73 74 69 6e 67 x/folder-listing
00 4f .O
> ACL Data RX: Handle 11 flags 0x02 dlen 17 #60 [hci0] 5.612611
Channel: 64 len 13 [PSM 3 mode 0] {chan 0}
RFCOMM: Unnumbered Info with Header Check (UIH) (0xef)
Address: 0x31 cr 0 dlci 0x0c
Control: 0xff poll/final 1
Length: 8
FCS: 0x89
Credits: 1
d1 00 08 cb 00 00 00 01 89 .........
< ACL Data TX: Handle 11 flags 0x00 dlen 16 #61 [hci0] 5.613075
Channel: 67 len 12 [PSM 3 mode 0] {chan 0}
RFCOMM: Unnumbered Info with Header Check (UIH) (0xef)
Address: 0x33 cr 1 dlci 0x0c
Control: 0xef poll/final 0
Length: 8
FCS: 0x4f
81 00 08 cb 00 00 00 01 4f ........O
> HCI Event: Number of Completed Packets (0x13) plen 5 #62 [hci0] 5.618623
Num handles: 1
Handle: 11
Count: 2
> ACL Data RX: Handle 11 flags 0x02 dlen 17 #63 [hci0] 5.623869
Channel: 64 len 13 [PSM 3 mode 0] {chan 0}
RFCOMM: Unnumbered Info with Header Check (UIH) (0xef)
Address: 0x31 cr 0 dlci 0x0c
Control: 0xff poll/final 1
Length: 8
FCS: 0x89
Credits: 1
a0 00 08 cb 00 00 00 01 89 .........
< ACL Data TX: Handle 11 flags 0x00 dlen 8 #64 [hci0] 5.624057
Channel: 67 len 4 [PSM 3 mode 0] {chan 0}
RFCOMM: Disconnect (DISC) (0x43)
Address: 0x33 cr 1 dlci 0x0c
Control: 0x53 poll/final 1
Length: 0
FCS: 0xa2
> ACL Data RX: Handle 11 flags 0x02 dlen 8 #65 [hci0] 5.628872
Channel: 64 len 4 [PSM 3 mode 0] {chan 0}
RFCOMM: Unnumbered Ack (UA) (0x63)
Address: 0x33 cr 1 dlci 0x0c
Control: 0x73 poll/final 1
Length: 0
FCS: 0x88
< ACL Data TX: Handle 11 flags 0x00 dlen 8 #66 [hci0] 5.628967
Channel: 67 len 4 [PSM 3 mode 0] {chan 0}
RFCOMM: Disconnect (DISC) (0x43)
Address: 0x03 cr 1 dlci 0x00
Control: 0x53 poll/final 1
Length: 0
FCS: 0xfd
> HCI Event: Number of Completed Packets (0x13) plen 5 #67 [hci0] 5.632625
Num handles: 1
Handle: 11
Count: 2
> ACL Data RX: Handle 11 flags 0x02 dlen 8 #68 [hci0] 5.632644
Channel: 64 len 4 [PSM 3 mode 0] {chan 0}
RFCOMM: Unnumbered Ack (UA) (0x63)
Address: 0x03 cr 1 dlci 0x00
Control: 0x73 poll/final 1
Length: 0
FCS: 0xd7
< ACL Data TX: Handle 11 flags 0x00 dlen 12 #69 [hci0] 5.632733
L2CAP: Disconnection Request (0x06) ident 5 len 4
Destination CID: 67
Source CID: 64
> ACL Data RX: Handle 11 flags 0x02 dlen 12 #70 [hci0] 5.637623
L2CAP: Disconnection Response (0x07) ident 5 len 4
Destination CID: 67
Source CID: 64
> HCI Event: Number of Completed Packets (0x13) plen 5 #71 [hci0] 5.863739
Num handles: 1
Handle: 11
Count: 1
< HCI Command: Disconnect (0x01|0x0006) plen 3 #72 [hci0] 7.631380
Handle: 11
Reason: Remote User Terminated Connection (0x13)
> HCI Event: Command Status (0x0f) plen 4 #73 [hci0] 7.632590
Disconnect (0x01|0x0006) ncmd 1
Status: Success (0x00)
> HCI Event: Disconnect Complete (0x05) plen 4 #74 [hci0] 7.727640
Status: Success (0x00)
Handle: 11
Reason: Connection Terminated By Local Host (0x16)
Device Disconnected: D4:63:C6:XX:XX:XX (0) reason 2
1 Answer
After continuing to try many different things, I realized that is was more than likely the Android device having the issue. The solution is that the Android device needs to have an FTP Service running in order to utilize obexftp -l or obexfs. I achieved this by installing ES File Explorer on the Android device and selecting 'bluetooth' under the 'Network' tab. This opens an Obex FTP path on Bluetooth channel 20. The code below now functions; as well as obexfs.
obexftp -b D4:63:C6:XX:XX:XX -B 20 -U none -l
answered on Stack Overflow Jan 1, 2018 by 
scott
scottUser contributions licensed under CC BY-SA 3.0