One of the nifties things I have on my cell phone is a bluetooth capability: the ability to communicate with other devices nearby at relatively high speeds over a wireless protocol. Bluetooth is a very useful tool for development: I don’t have to worry about USB cables or anything else, and I can talk equally well to my Linux desktop with an abicom BT adapter as I can to my Powerbook with its built-in bluetooth.<\/p>\n
One thing that no one has mentioned yet about the new Python release is the Bluetooth console. It took some doing, but I finally got it connected to my Linux desktop, and found an app that will let me connect to the port. Now, I basically have a way to tell my phone what to do over Bluetooth:<\/p>\n
[crschmidt@peanut ~]$ sudo cu -l \/dev\/rfcomm0 \nConnected.\nPython 2.2.2 (#0, Dec 2 2004, 18:12:32) \n[GCC 2.9-psion-98r2 (Symbian build 540)] on symbian_s60\nType 'copyright', 'credits' or 'license' for more information.\nType 'commands' to see the commands available in this simple line editor.\n>>> <\/pre>\nThis has sped up my application development significantly: with this in place, I can start to experiment with different code at a rapid rate: without sending almost identical files to the phone several dozen times to test them, nor typing on the 3650’s keypad to enter my code. I just type into a normal tty, and it acts exactly like a local python interpreter.<\/p>\n
This is also possible, and documented as such, using TCP\/IP over GPRS instead of Bluetooth. However, the speed restrictions of that cause it to be much less practical. It’s like typing into ssh over bluetooth: sure, it’s okay, but you almost never want to do it if you can avoid it.<\/p>\n
Here’s what I ended up doing to get it working:
\n – Get a working bluez install. Bluez is the standard Linux protocol stack, and is built in to most recent kernels.
\n – Test that you can talk to the phone, using hcitool scan, hcitool info.
\n – Register an “SP” (serial port) service with sdpd. sdptool add --channel=3 SP<\/tt>
\n – Ensure that sdpd is running
\n – Set up an rfcomm port to receive the communications: rfcomm listen \/dev\/rfcomm0 3<\/tt>
\n – (On Phone) Open Python, then bt_console.py
\n – On the computer, you should see:<\/p>\n[crschmidt@peanut ~]$ sudo rfcomm listen \/dev\/rfcomm0 3\nWaiting for connection on channel 3\nConnection from 00:60:57:41:86:C2 to \/dev\/rfcomm0\nPress CTRL-C for hangup<\/pre>\n– Using taylor-uucp, type cu -l \/dev\/rfcomm0
\n – Welcome to the phone!<\/p>\nIf you want to test to make sure it’s working, you can do something simple like:<\/p>\n
import appuifw\nappuifw.note(u'Howdy!', 'info')<\/pre>\nfrom there, refer to the excellent Nokia documentation for more tips and tricks on what you can do. I think this is definitely a great example of what power the distribution has, and I’m surprised that more people haven’t been writing about it. Has anyone besides me (and Nokia employees) gotten this working?<\/p>\n","protected":false},"excerpt":{"rendered":"
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