Reading serial spp Bluetooth device

I have A device that sends a message over blutooth (spp) once a second and i want to read the device and record the output with out missing messages. problem is it seems like the timing gets off and i miss messages or get half messages sometimes. cant find a way to read consitant. The device does not seem to have a termination char being sent so its hard to find end of message and the number of bytes sent can vary. Any ideas???
thanks 
brian
Attachments:
read example.vi ‏23 KB

Is there anything in the message stream that tells you how long a message is?  Such as the first 1 or 2 or 4 bytes saying how many bytes there are to read?  If so, read that many bytes, then immediately decode that to determine how many more bytes to read (thus getting rid of the the bytes at port method).
If not, how do you know where one message ends and another message begins?
You can read conitnuously and build your message stream up in a string shift register.  Keep looking at the string and once you get a complete message, delete that out and process it, leaving the remaining bytes in the shift register.

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