Hi Vasily,

quoted

quoted

Some adapters (e.g. RTL8723CS) advertise that they have more than
2 pages for local ext features, but they don't support any features
declared in these pages. RTL8723CS reports max_page = 2 and declares
support for sync train and secure connection, but it responds with
either garbage or with error in status on corresponding commands.

please send the btmon for this so I can see what the controller is responding.

Here is relevant part:

< HCI Command: Read Local Extend.. (0x04|0x0004) plen 1  #228 [hci0] 6.889869
       Page: 2

quoted

HCI Event: Command Complete (0x0e) plen 14             #229 [hci0] 6.890487

     Read Local Extended Features (0x04|0x0004) ncmd 2
       Status: Success (0x00)
       Page: 2/2
       Features: 0x5f 0x03 0x00 0x00 0x00 0x00 0x00 0x00
         Connectionless Slave Broadcast - Master
         Connectionless Slave Broadcast - Slave
         Synchronization Train
         Synchronization Scan
         Inquiry Response Notification Event
         Coarse Clock Adjustment
         Secure Connections (Controller Support)
         Ping
< HCI Command: Delete Stored Lin.. (0x03|0x0012) plen 7  #230 [hci0] 6.890559
       Address: 00:00:00:00:00:00 (OUI 00-00-00)
       Delete all: 0x01

quoted

HCI Event: Command Complete (0x0e) plen 6              #231 [hci0] 6.891170

     Delete Stored Link Key (0x03|0x0012) ncmd 2
       Status: Success (0x00)
       Num keys: 0
< HCI Command: Read Synchronizat.. (0x03|0x0077) plen 0  #232 [hci0] 6.891199

quoted

HCI Event: Command Complete (0x0e) plen 9              #233 [hci0] 6.891788

     Read Synchronization Train Parameters (0x03|0x0077) ncmd 2
       invalid packet size
       01 ac bd 11 80 80                                ......
= Close Index: 00:E0:4C:23:99:87                              [hci0] 6.891832

hci0 registration stops here and bluetoothctl doesn't even see the controller.

maybe just the read sync train params command is broken? Can you change the init code and not send it and see if the rest of the init phase proceeds. I would rather have the secure connections actually tested before dismissing it altogether.

Mind you, there were broken Broadcom implementation of connectionless slave broadcast as well. Maybe this is similar.

Regards

Marcel


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