DZone Snippets: s60 code

gps gsm location python s60

ollip1 () — Mon, 15 May 2006 21:09:44 GMT

Hi Guys,

I've just put together two smaller Python apps I've seen around in this discussion board.

The resulting app prints 1) info obtained by a BT gps (i.e. $GPRMC sentence, but may change as you like) and 2) GSM cell id.

My wish is to collect these info periodically (i.e. 2/3 minutes) and send them back via an HTTP POST to a specified host.... could anybody help? ;-)

Thanks

-Luca

____________________________________

# Simple BT App
#$GPRMC,161229.487,A,3723.2475,N,12158.3416,W,0.13,309.62,120598, ,*10

import socket,location,urllib

class BTReader:

def connect(self):
self.sock=socket.socket(socket.AF_BT,socket.SOCK_STREAM)
address,services=socket.bt_discover()
print "Discovered: %s, %s"%(address,services)
target=(address,services.values()[0])
print "Connecting to "+str(target)
self.sock.connect(target)

def readposition(self):
try:
buffer=""
ch = self.sock.recv(1)
while(ch !='\n'):
buffer+=ch
ch = self.sock.recv(1)
# print buffer

if (buffer[0:6]=="$GPRMC"):
(GPRMC,utc,status,lat,latns,lon,lonew,knots,course,date,xx1,xx2)=buffer.split(",")
return "GPS (%s,%s,%s,%s,%s)"%(utc,lat+latns,lon+lonew,knots,course)
except Error:
return "Error!\n"
return ""

def close(self):
self.sock.close()

class GSM_loc:

def upd(self):
self.loc = location.gsm_location()
return "GSM (MCC:%s MNC:%s LAC:%s CID=%s)"%(self.loc[0], self.loc[1], self.loc[2], self.loc[3])

gsm = GSM_loc()

bt=BTReader()
bt.connect()

i=0
while (i<15):
print gsm.upd()
print bt.readposition()
i+=1

bt.close()

s60 http post python

ollip1 () — Mon, 15 May 2006 21:08:37 GMT

From (http://www.python.org/doc/current/lib/httplib-examples.html)

==
import httplib, urllib

# replace with whatever you want POSTed...
gps_coords = urllib.urlencode({'param_1': 'value_1', 'param_2': 'value_2'})

# form contents
headers = {"Content-type": "application/x-www-form-urlencoded", "Accept": "text/plain"}

conn = httplib.HTTPConnection("location-server.com:80")
conn.request("POST", "/cgi-bin/collect_loc", gps_coords, headers)
response = conn.getresponse()
data = response.read()
conn.close()
==

Both httplib and urllib are shipped with PyS60. Of course, you will have to create the CGI script separately.

Cheers,
Sandeep
http://sandeep.weblogs.us/

Discover bluetooth devices around you

korakot (Korakot Chaovavanich) — Fri, 16 Dec 2005 03:30:52 GMT

Pys60 has good bluetooth support from the beginning.
However, to discover another device, it require you to
interact with the app, choosing a device from the list.
PDIS has a library that help you list all devices silently.



# need to install these 2 modules from PDIS first

import aosocketnativenew

from aosocket.symbian.bt_device_discoverer import *



def callback(error, devices, cb_param=None):

    for address, name in devices:      

        print "Found: ", name, address

# You can get more data by importing socket and try 

# bt_discover(address) or bt_obex_discover(address)

# see details in official pys60 doc on socket module



lister = BtDeviceLister()

lister.discover_all(callback, None)

I summarize the code above from thejamo's example here.
His code is more complete with error checking.

Getting key press

korakot (Korakot Chaovavanich) — Sun, 04 Dec 2005 19:58:08 GMT

In Pys60 1.2 there are 3 types for app.body, namely
- Canvas
- Text
- Listbox
They can recieve and process key press.
In older versions, they all have a bind method:
bind(event_code, callback)
event codes are defined in key_codes module
You can import some or all of them
from key_codes import EKeyLeftArrow, EKeySelect, EKey9, EKeyEdit See diagram for 6630.

In the latest version, Canvas gains ability to respond
to events in more details. You can give it 2 callbacks
when creating a Canvas object.
c = Canvas(redraw_callback=None, event_callback=None)
event_callback will get a dict of the key event containing:
- 'type': one of EEventKeyDown, EEventKey, or EEventKeyUp
- 'keycode': the logical key
- 'scancode': the physical key
- 'modifier': probably about Shift, Ctrl ?

The simplest use is to detect when type=EEventKey
and use the 'keycode' value.
For advanced use, look at keyviewer.py example.

Nokia platform version

korakot (Korakot Chaovavanich) — Fri, 04 Nov 2005 13:08:44 GMT

The way Nokia names their phone versions is rather confusing.
For example.
Series 60 Platform 2nd edition feature pack 2

I wonder why don't they just use s60.2.2
Now, at least they have renamed 'Series 60' to 'S60'
which is a good step in the right direction.

So, I will tag all new python for series 60 scripts with
'python, s60' instead of the old 'python, series60'.