Reading GPS Data from a Bluetooth Receiver

Question

I have a problem when I connect my mobile to a Bluetooth GPS Receiver using the JSR 82 BTAPI.
My mobile is reading the NMEA data from the GPS Receiver and analizes the data. The NMEA data from the GPS Receiver is delivered every second.
It works fine for a few minutes. After approximately 5 minutes my mobile hangs (the screen freezes).
I am using a Siemens S65 (MIDP-2.0, CLDC-1.0).
InputStream in = null;
StreamConnection conn = null;
conn = (StreamConnection) Connector.open(BtsppURL);
in = conn.openInputStream();
ByteArrayOutputStream bytearrayoutputstream = new ByteArrayOutputStream();
int ch = 0;
//each NMEA Message ends with <CR><LF>
while ( (ch = in.read()) != '\n') {
          bytearrayoutputstream.write(ch);
bytearrayoutputstream.flush();
byte[] b = bytearrayoutputstream.toByteArray();
String gpsStr = new String(b);Thx for any suggestions,
RH.

Answer 1

Hello RH -
I hope you've resolved your problem by now, but a related problem I've seen under Java - both on Nokia and Siemens phones, is in creating/destroying threads.
If the BT reading thread is being created and destroyed, this will stop working after a short period of time in my experience.
Instead, launch a thread to read the GPS data - say every second or two - and implement the timer.sleep inside the thread.
I'm experiencing the "BT Error Code 4" though on the Siemens S65 phone (a number of posts about this on Siemens Forum), hopefully will have this resolved today.
Best,
-- Rich Moore