investigating BT problem MacBook Pro <-> Aqualung i770R

[Jef Driesen]

On 27/05/2022 18:23, Daniel Azuelos via subsurface wrote:
> Since Subsurface 5.0.8 was crashing sometimes during repeated tests,
> I went back to 4.9.7 which seemed to be crash proof in the exact
> same radio environment.
> 
> Distance from my Mac to the i770R: 	30 cm.
> 			i770R	RSSI:	-62 dB
> Nb of other env. BT equipments:		9
> 			best RSSI:	-54 dB
> 
> Here are my results on 30 attempts to just download from the i770R
> and then exit without saving:
> 	----------------
> 	success	failure
> 	----------------
> 	22	8
> 	----------------
> 
> Strange behaviour: the time to get an answer either success or failure
> seems to vary from 2 s to 30 s. Is this coming from the underlying
> BT driver?
> Here are included 2 subsurface log I got with the -vv arg.

Based on the information in the failure log file:

> qt_ble_open( {c7d52420-5e99-4800-a1bc-e5b07b2d0770} )
> trying to connect
> timeout while trying to connect to the controller  {c7d52420-5e99-4800-a1bc-e5b07b2d0770}
> Finishing download thread: "Unable to open LE:{c7d52420-5e99-4800-a1bc-e5b07b2d0770} Aqualung (i770R)"

This is a problem at the bluetooth (or driver) layer. Subsurface is unable to 
connect, so we don't even get a chance to communicate with the dive computer.

Jef