[maemo-developers] Connecting RS232 devices to N800 hosting OS2008

[From: Ryan Pavlik]

Have you checked the permissions on the device file to ensure that your 
user ("user") has write permissions (and/or tried running this as root?)

Ryan

James Kemp wrote:
> I'm using a N810, but the problem of connecting a RS232 device is 
> probably the same.
>
> I'm getting close to getting a RS232 connection working using 
> Bluetooth and Python2.5. The code below is getting me close. I can 
> receive RS232 string over Bluetooth using this code. I just can't seem 
> to figure out how to send string out. If I try and use PySerial 
> package I get an error when trying to open the port.
>
> #! /usr/bin/env python2.5
> import dbus
> import time
> import sys
> import thread
> #import serial
>
> PortOpen = 0
> ser = ""
>
> # 
> =============================================================================
> def OpenPort ( COM_Port ):
>     global ser, PortOpen
>     try:
>     print "Opening %s port" % COM_Port
>     #ser = serial.Serial( COM_Port, 115200, timeout=0, 
> parity=serial.PARITY_NONE, rtscts=0)
>         ser = open( COM_Port, 'r+' )
>         PortOpen = 1
>     except:
>         print "Error opening serial port."
>         exit()
>
>
> # 
> =============================================================================
> def CommThread ( tid ):
>     """ This function is designed to be run as a thread task. """
>     global gTID, PortOpen
>     gTID = tid
>     i = 0
>     while PortOpen:
>         s = ser.readline( ).strip( '\r\n' )
>         print s
>     print "CommThread Ending %d" % PortOpen
>
> bus = dbus.SystemBus()
> bmgr = dbus.Interface( bus.get_object('org.bluez', '/org/bluez'), 
> 'org.bluez.Manager')
> bus_id = bmgr.ActivateService('serial')
> serial = dbus.Interface(bus.get_object( bus_id, '/org/bluez/serial'), 
> 'org.bluez.serial.Manager')
>
> # Service connection, read the serial API to check the available patterns
> address = "00:01:95:06:CF:88"
> service = "spp"
>
> # Bind to the default local adapter
> device = serial.ConnectService( address, service )
> print "Connected %s to %s" % (device, address)
>
> time.sleep(1)
> OpenPort( device )
> thread.start_new( CommThread, (1234,) )
>
> print "Press CTRL-C to disconnect"
>
> while(1):
>     s = raw_input()
>     print "Writting %s" % s
>     ser.write(s)
>     ser.flush()
>
> serial.DisconnectService(device)
>
> ------------------------------------------------------------------------
>
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