[Twisted-Python] Question : Failed to read gpsfake

[bino oetomo]

Dear All ...

I try to simulate a gps with gpsfake.
gpsfake create virtual port at /dev/pts/4

my code is posted at : http://pastebin.com/j2wn1aXh

It's never reach the 'lineReceived' part.
I Got no error msg.

The log only said

2012-02-23 16:02:50+0700 [-] Log opened.
2012-02-23 16:02:50+0700 [-] twistd 11.1.0 (/usr/bin/python 2.6.6) 
starting up.
2012-02-23 16:02:50+0700 [-] reactor class: 
twisted.internet.pollreactor.PollReactor.
2012-02-23 16:02:50+0700 [-] debug : Serial Service start


Kindly please give me any enlightment about this problem

Sincerely
-bino-