On 2015-01-13 08:49, Dirk Hohndel wrote:
On Tue, Jan 13, 2015 at 08:25:50AM +0200, Willem Ferguson wrote:
I tested Uwatec Galileo Sol on Ubuntu 10.04 LTS
1) Upload whole dc dive log ok.
2) Second download: I selected certain dives only from the download
panel
(actually de-selected some dives)
Only the selected dives were transfered to dive list. ok.
3) Upon CANCEL while downloading, it ignored the cancelation and still
continued to download the complete dc dive log. Probably not ok.
That's odd - I wonder if this is an issue of the backend not being able
to
cancel. At least in my testing the cancel was delivered and we did
cancel
successfully with a partial download. But I've only tried this using
the
simulator (in that case a Suunto VyperAir, in case that matters).
I have no experience with the Uwatec Galileo backend and don't know if
there's anything different there wrt canceling a download.
This is normal. Not all libdivecomputer backends support cancellation.
Whether libdivecomputer will act upon the cancellation request or not
also depends on the underlying communication protocol.
In a nutshell, libdivecomputer usually checks for a cancellation request
before sending a command to the device. Thus, if the dives are
downloaded with multiple smaller packets, then the cancellation will be
almost instant. If they are downloaded all at once, with just one large
request, then the cancellation won't even be noticed. Aborting the
download while a transfer is still in progress, might have unexpected
side effects. Therefore libdivecomputer plays on the safe side and won't
do that.
The Uwatec Galileo is one example where all data is download at once.
Jef
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