General :: Configure System To Act As A Bluetooth RFCOMM SPP Server?
May 18, 2010
I'm writing a phone app for Android that connects to a bluetooth RFCOMM device in my car. My phone app talks AT commands with it. For development work, I often need to communicate with the device to try different commands and things.
My neighbors are starting to think I'm weird because I sit in my car for hours on end with my laptop screen shining on my face, typing away like a script kiddie.
I'd much rather configure one of my many Linux servers to act as a bluetooth RFCOMM device and allow me to connect to it (indoors, while I sit on my couch).
I imagine I have to start with something like
sdptool add SP
But then what?
I'm perfectly happy writing a perl app to handle the I/O, but I just don't know how to make the bluez stack accept connections and subsequently pipe that stream to a perl app.
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Jul 6, 2010
System Details:
Code:
Things I have tried so far:Followed tutorials found here at [url] and [url] None of which worked.
Some output from what appears to be a valid connection:
I have run sdptool browse and found my device
I have used hcitool scan and found my device
I have done a cat of /dev/rfcomm0 and seen data streaming
I have seen a process id for gpsd as well as seen a listneing port for gpsd
I have been unable to get either gpsdrive / xgps / tangogps to see gpsd. All report it as not running.
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Mar 11, 2010
First, excuse me for my bad english I want to connect a bluetooth device with the command rfcomm. In a terminal, I put the command :
Code:
rfcomm connect 0 00:80:98:E4:07:53
And the system answers :
Code:
Connected /dev/rfcomm0 to 00:80:98:E4:07:53 on channel 1
Press CTRL-C for hangup
On fedora 10, or 11, I can use this command with all users. On fedora 12, only the root user can connect and use this device. Other users have the message :
Code:
Can't open RFCOMM device: Permission denied What can I do to resolve this problem?
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Code:
A simple python script connects to this device, reads and prints a line
Code:
/var/log/syslog shows:
Quote:
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In theory, the above would allow me to consolidate everything but the disklessworkstations on a single server and eliminate all wired (and wireless) connections except the broadband connection to the Internet and the cabling to the nearest power outlets. It appears technically possible, but I'm not sure about the various virtual connections among VMs. In theory, each VM should be able to communicate with the other as if it was on the same network via the server data bus, but what about setting up firewall zones? Any internal I/O bandwidth bottlenecks? Any other potential "gotchas", caveats, issues? (Other than the obvious requirement of having enough CPU and RAM).Any thoughts or observations welcome, especially if they are from real world experience in a VM environment. BTW--in case you're wondering why I'm posting here, it's because I run Debian on all my workstations/servers (running VirtualBox as a VM for Windows XP on one workstation).
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I've tried using bluetooth and rfcomm to connect but the devices do not pair. Even l2ping isn't able to communicate with my phone.
When i use rfcomm with the connect command a dialog pops up on my phone requesting pin and i enter the one in my /etc/bluetooth/pin but then nothing happens and rfcomm exits saying connection refused.
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I can't configure Bluetooth in Slackware 13.1. It basically works. I can scan my mobile phone:
Code:
$ hcitool scan
Scanning ...
BA:BE:DE:AD:AB:ED Nokia 6300
But when I try other commands, mobile phone asks me about passcode. Because I don't know it pairing fails:
Code:
$ gammu 6300 --identify
Error opening device. Unknown, busy or no permissions.
On the other hand when I try to pair computer using mobile phone it doesn't find any device.
Code:
Pair new device
Searching for devices
No devices found
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this site which contains steps like code...
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May 8, 2010
# rfcomm -a
rfcomm0: 00:1A:89:09:8C:77 channel 1 clean
rfcomm1: 00:07:E0:2E:99:43 channel 3 clean
Then I connect by the mobile, and:
# rfcomm -a
rfcomm0: 00:1A:89:09:8C:77 channel 1 clean
rfcomm1: 00:07:E0:2E:99:43 channel 3 clean
rfcomm2: 00:1BC:0F:5C:AB -> 00:07:E0:2E:99:43 channel 1 connected [reuse-dlc release-on-hup tty-attached]
What the heck is that rfcomm2, when that mobile is bound to rfcomm1? Is it udev that makes fun of me? If so, how to bind the devices to specific rfcomm interfaces via udev?
[Code]...
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May 21, 2010
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root (hd0,2)
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default=2
timeout=5
splashimage=(hd0,2)/grub/splash.xpm.gz
hiddenmenu
title CentOS (2.6.9-89.ELsmp)
[Code].....
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[Code]....
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