Changed from sending NULL to send bd_addr (IDFGH-2576)

[KollarRichard]

"Resolves #4660 "
NULL sent to is_connected() is causing crashing.

[Alvin1Zhang]

Thanks for reporting and sorry for the slow turnaround. Sorry that we are now during the holiday of Chinese Lunar New Year. Will update to you when we are back, thanks.

[AbnerFederer]

Hi @KollarRichard

The same fix has been done inside. And we also extended the fix for connection issues for Apple devices. Please get the lastest IDF to find the fix.

Thanks
Abner

[KollarRichard]

@AbnerFederer Thank you.
Will this fix be also used in Release/v4.1?
Unfortunately we have more issues with connecting headphones. For example Sony headphones have issue with codec negotiation.

[AbnerFederer]

Hi @KollarRichard,

Yes, we will backport it to release/v4.1.
Thanks very much for the code and feel free to open issues and PRs during your development.

Thanks
Abner

[CLAassistant]

All committers have signed the CLA.

[Alvin1Zhang]

@KollarRichard Thanks for your contribution.