Willem,

Since you are building from source, can you see if Jef's analysis is correct 
and it is the simplification that I had implemented in libdivecomputer that 
causes the problem?

cd ~/src/subsurface/libdivecomputer
git revert 8ea8ceb
cd build
make && make install
cd ../../build
make

and then try that freshly built Subsurface to see if that fixes the problem?

Thanks

/D

> On Feb 5, 2018, at 5:44 AM, Jef Driesen <[email protected]> wrote:
> 
> On 2018-02-05 14:00, Anton Lundin wrote:
>> On 05 February, 2018 - Willem Ferguson wrote:
>>> This weekend I used a Shearwater predator dive computer. Connecting
>>> via Bluetooth no problem, had to force it to classical bt as it
>>> defaulted to LE. However, downloading the dive to Subsurface
>>> provides two problems:
>>> 1) The duration for each dive is exactly half of what it was in real
>>> life. So there is a problem with setting up the correct time
>>> increments for successive samples.
>> This might be due to the parser by some reason parsing it as petrel
>> data. The petrel sample size is twice the sample size of the predator.
>> Are you sure you did pick "predator" ?
> 
> The predator doesn't support the newer petrel protocol. So I assume Willem 
> did indeed select "Predator", otherwise the download would have failed.
> 
> But you are pointing in the right direction. The subsurface branch introduced 
> a bug with commit 8ea8cebb4e6c3d86b9ceb2291caa077dabd2a3f7. There, the 
> "petrel" parameter was removed and replaced with the model number. But the 
> purpose of that parameter is to indicate whether the data came from the 
> petrel or the predator backend. And because the model number appears to be 
> stored incorrect in Willem's data (zero instead of 2), the data gets indeed 
> parsed using the petrel format.
> 
> Jef
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