On 06-01-15 10:30, Stefano Mersi wrote:

I have a Mares Nemo and an IRIS RS232 interface. If anyone is

interested in helping the debug here, I thank them in advance. More detailed info follow.

I have tried to download all the dives from my Mares Nemo via the

IRIS interface (the old one, which connects through RS232). It apparently did not work using subsurface, so I rolled back to the debug tools in libdivecomputer, following the instructions to obtain all the needed info. The download with the 'universal' test went smoothly from 0% to 100%, but I get periodic warnings: "[6.324485] WARNING: Only the first packet has a correct checksum. [in mares_nemo.c:257 (mares_nemo_device_dump)]" every ~ 100 packets). If anyone is interested in looking into this, I attach all the debug info.

With the nemo protocol, each data packet is send twice. You seem to receive many data packets with an incorrect checksum, which is a sign of data corruption during the transmission (bad/wet contacts?). But as long as at least one of those two parts is good, the download can proceed.

Not sure why the download fails in subsurface, but I suspect you had bad luck and received a packet where both parts were corrupt. Next time, enable the "libdivecomputer logfile" checkbox and send the generated logfile when the download fails. Without the logfile I can only guess what went wrong.

Jef