[MacOS] [BlueTooth] BT problem MacBook Pro <-> Aqualung i770R

[Daniel Azuelos]

On the announcment of Subsurface 4.9.7 I read:

| bluetooth/rfcomm: fix broken classic BT downloads on Linux and Windows; macOS is still broken

I am using this version, and confirm that it looks like there is a random
timeout problem even within a not too crowded rfcomm environment ( less than 10
Wi-FI and BT neighbours ).

What is the status of this remaining bug with the later versions?

How may I be of any help on investigating this problem?
Which tool is any good to analyse Bluetooth RF environment
( I am fluent in CLI on any Unixes and MacOS )?
Which version should I focus on?
-- 
    « The only thing necessary for the triumph of evil
    is for good men to do nothing. »
                                                Edmund Burke
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daniel Azuelos