I tested 20719 audio_watch demo.
It can be successfully paired and connected with Bluetooth speakers.
However, when the Bluetooth speaker initiates a connection to 20179 (such as automatic reconnection when starting up), it is always unsuccessful.
There should be L2CAP connection request after "HCI_Encryption_Change", but in fact there is nothing.
Attach hci trace files, from BTSPY
ModusToolbox Bluetooth SDK
Can you please let us know the steps you follow to reproduce this issue? Are you using default watch example or modified one ?
Can you also provide us the details about the Bluetooth speaker which you are using?
I used default watch example.
Use ClientControl discovery BR/EDR - AV Source connect - Disconnect - Restart the Bluetooth speaker to automatically connect to the previous device - Can't connect
702--Self developed product, A2DP sink based on Qualcomm qcc3007 chip(connect to mobile phone OK)
MI18--Xiaomi Xiao ai Bluetooth speaker
Airpods has another problem，L2CAP connect successful but "SET CONFIGURATION" rejected.