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-   -   How to make a 'Bluetooth serial port' between N900 and laptop(Linux)? (https://talk.maemo.org/showthread.php?t=76477)

justforfun 2011-09-11 16:04

How to make a 'Bluetooth serial port' between N900 and laptop(Linux)?
 
I did a trial to setup a 'Bluetooth serial port' between my N900 and my laptop(Ubuntu installed), but failed.
I record the process as below, please help to find the reason, thanks!

On the laptop side:
Code:

# hcitool scan
Scanning ...
        C8:97:9F:E3:28:44        Nokia N900
# export N900='C8:97:9F:E3:28:44'

On N900 side:
Code:

# hcitool scan
Scanning ...
        88:9F:FA:F3:F5:0A        BlueZ (1)
# export LAPTOP='88:9F:FA:F3:F5:0A'


To add the Serial Port protol, I execute the command on both sides:
Code:

# sdptool add --channel=10 SP
Serial Port service registered

Then I searched the services on laptop side:
Code:

# sdptool records $N900
...
Service Name: Serial Port
Service Description: COM Port
Service Provider: BlueZ
Service RecHandle: 0x10005
Service Class ID List:
  "Serial Port" (0x1101)
Protocol Descriptor List:
  "L2CAP" (0x0100)
  "RFCOMM" (0x0003)
    Channel: 10
Language Base Attr List:
  code_ISO639: 0x656e
  encoding:    0x6a
  base_offset: 0x100
Profile Descriptor List:
  "Serial Port" (0x1101)
    Version: 0x0100
...

Then I searched the services on N900 side:
Code:

# sdptool records $LAPTOP
...
Service Name: Serial Port
Service Description: COM Port
Service Provider: BlueZ
Service RecHandle: 0x10006
Service Class ID List:
  "Serial Port" (0x1101)
Protocol Descriptor List:
  "L2CAP" (0x0100)
  "RFCOMM" (0x0003)
    Channel: 10
Language Base Attr List:
  code_ISO639: 0x656e
  encoding:    0x6a
  base_offset: 0x100
Profile Descriptor List:
  "Serial Port" (0x1101)
    Version: 0x0100
...

On laptop side:
Code:

# cat /etc/bluetooth/rfcomm.conf
#
# RFCOMM configuration file.
#

rfcomm0 {
#        # Automatically bind the device at startup
        bind yes;
#
#        # Bluetooth address of the device
        device C8:97:9F:E3:28:44;
#
#        # RFCOMM channel for the connection
        channel        10;
#
#        # Description of the connection
        comment "Example Bluetooth device";
}

On N900 side:
Code:

# cat /etc/bluetooth/rfcomm.conf
#
# RFCOMM configuration file.
#

rfcomm0 {
#        # Automatically bind the device at startup
        bind yes;
#
#        # Bluetooth address of the device
        device 88:9F:FA:F3:F5:0A;

#        # RFCOMM channel for the connection
        channel        10;

#        # Description of the connection
        comment "BT COM TEST";
}

Then create the rfcomm0 on both sides:
Code:

mknod /dev/rfcomm0 c 216 1
chmod 666 /dev/rfcomm0

Load the conf file on both sides:
Code:

rfcomm -f /etc/bluetooth/rfcomm.conf
Start to connect on N900 side, but failed:
Code:

# rfcomm connect /dev/rfcomm0
Can't connect RFCOMM socket: Connection refused




Some hints below:

On laptop side, I can connect to N900 via below command, but only for a few seconds:
Code:

# hcitool cc C8:97:9F:E3:28:44
root@maemo-desktop:/etc/bluetooth# hcitool con
Connections:
        < ACL C8:97:9F:E3:28:44 handle 12 state 1 lm SLAVE
root@maemo-desktop:/etc/bluetooth# hcitool con
Connections:

And also on laptop side, I can l2ping the N900:
Code:

# l2ping C8:97:9F:E3:28:44
Ping: C8:97:9F:E3:28:44 from 88:9F:FA:F3:F5:0A (data size 44) ...
44 bytes from C8:97:9F:E3:28:44 id 0 time 18.97ms
44 bytes from C8:97:9F:E3:28:44 id 1 time 15.46ms
44 bytes from C8:97:9F:E3:28:44 id 2 time 27.80ms
44 bytes from C8:97:9F:E3:28:44 id 3 time 20.50ms
44 bytes from C8:97:9F:E3:28:44 id 4 time 20.78ms
44 bytes from C8:97:9F:E3:28:44 id 5 time 29.30ms
44 bytes from C8:97:9F:E3:28:44 id 6 time 8.01ms
44 bytes from C8:97:9F:E3:28:44 id 7 time 19.67ms
Send failed: Connection reset by peer


justforfun 2011-09-11 16:27

Re: How to make a 'Bluetooth serial port' between N900 and laptop(Linux)?
 
I guess it should be related with the passkey/pincodes, but I didn't know how to set the passkey/pincodes under the latest bluez version(installed via apt-get install bluez).

And I did another trial earlier with same process between N900 and laptop(Win7 installed + BlueSoleil + Serial port software), this one succeeds.

Could anyone help to analyse my process?

lightscribe 2016-03-31 06:55

Re: How to make a 'Bluetooth serial port' between N900 and laptop(Linux)?
 
hi did you managed to get it working?


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