On 8 Jun, 2012, at 2:16, Mike Wirth wrote:

> Hi, folks,
> 
> Newbie (to Python) here.  I'm porting a Python app from Windows that talks to 
> a Bluetooth 2.1 device using the serial profile (on WinXP it shows up as two 
> numbered COM ports, one inbound and the other outbound)  On the Mac, the 
> device shows up in /dev as:
> 
>     crw-rw-rw-  1 root  wheel   18,   7 May 30 23:12 cu.BlueRadios-COM0
> 
> On Windows, the app requires me to install pyserial (and pygame for the 
> visual output).  
> 
> On the Mac, where I've installed and am using python 2.7.3 (rather than the 
> pre-installed 2.6.7), my app starts up and acts like it doesn't need to have 
> pyserial installed, but of course, it can't connect to the expected numbered 
> COM port.
> 
> 1. Do I need the Mac equivalent of pyserial?

pyserial works fine on OSX. 

> 2. Or can I just stuff something like '/dev/cu.BlueRadios-COM0' in the app's 
> source code where it expects to open the serial port.

Probably.  The last time I used pyserial on OSX I just used numeric indexes to 
probe for the device:

for pn in range(10):
    try:
        port = serial.Serial(pn, timeout=0.5)
        break
    except serial.SerialException:
        pass
else:
    raise RuntimeError("Cannot find port")

The main advantage for me was that the same code works on Windows as well.


> 3. Anything special about the Bluetooth serial profile (e.g., setting port 
> properties)?

I haven't used Bluetooth, with some luck the exposed serial device can be 
configured just like any other serial device using pyserial.

There is a low-level Bluetooth framework as well, but I don't know if someone 
has writting python bindings for that.

Ronald

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