OSTC over BLE experiences and questions

[Jan Mulder]

I have been trying to implement the connection over BLE to an OSTC 
device (in my case an OSTC3 with the Telit/Stollmann BT/BLE hardware). 
 From the current status, I constructed a pull request for Subsurface 
(https://github.com/Subsurface-divelog/subsurface/pull/466).

Basically, I'm stuck at the current point. The download over BLE works 
perfect for a short period, in which the following sequence of commands 
are issued:

- 0xBB: init the OSTC3 in Download mode

- 0x60: hardware and Features

- 0x69: version/identity

- 0x6D: send compact headers (4Kb data)

So, far so good. All this data is correctly received and processed on 
the Subsurface/libdc side.


- 0x66: send one dive including profile, for index 0x86


This results in correct reception of the header (256 bytes), followed by 
some samples (in total 624 bytes) so a very small fraction of the 
selected approx 1 hour dive, that results in approx 20kb).


And then is just stops, until a timeout is hit. No bluez errors (testing 
this on Arch Linux, with bluez BT stack), no weird packets in the 
snooped BT traffic (file available for analysis if needed), noting 
relevant in the journal/systemd logging, no kernel messages).

So it seems that the OSTC3 just stops sending. So my question for 
Matthias ... any idea what is going on here?


regards,


--jan

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