Bluetooth Serial Port Profile (SPP) Demo Application

The enclosed application is a sample of how to interface with the Palm Bluetooth SPP service.  This example uses a BT 335 GPS 
data logger to collect GPS data and display this information within a webOS scene.  Other NMEA compatible should work with this sample
although none beyond the BT-335 device has been tested.


To use this example, the following steps are required.
    1. Power-on and Pair the BT-335 to the webOS device.  The password for this device is 0000
    2. Make sure the Green GPS light is blinking.  This indicates GPS data acquisition.
    3. Install this sample and run.  Within a few seconds GPS data should appear.  
    4. The standard NMEA data rate is slow and accordingly the refresh rate is set to 2.5s.
    
Application Flow:
    1.  Acquire the address of the device.  This is NOT the "name" value shown when pairing, use the gettrusteddevices method 
        to retrieve the BT address using the paired name.  In our case below, the functions activate and getDevicesSuccess
        handle the address lookup.  Here we search for any paired device with a name containing 'GPS' or 'gps'.
    2.  Setup notification message handling using sppNotify.
    3.  Open SPP connection.
    4.  Read SPP port data (this needs to be called recursively to collect NMEA data)
    5.  On timeout(set by:this.serialPortPollRate), read SPP again.
    6.  On close, close port and shutdown services.    


More info on NMEA 0183:
   http://en.wikipedia.org/wiki/NMEA_0183
   http://www.nmea.org/content/nmea_standards/nmea_083_v_400.asp