STM32WB55RG-D01 : advertising works but connects no longer possible

[PSchb.1]

i'm using a NUCLEO STM32WB55RG-D01 eval board.

BLE_HeartRateFreeRTOS sample and my test app were working fine.

after some time of development my test app i found

• my test app is still running ok doing some serial communication but
• BLE still advertises my device name but i'm no longer able to connect to device over BLE (connection timeout)

to check whether it's related with my test app i switched back to the (unchanged) sample app : BLE_HeartRateFreeRTOS : also there i still see it advertising but trying to connect always runs into timeout (same symptoms as with my app).

what migth be broken and why ? what can i do to check (and possibly fix) why it is failing now even with the unchanged sample apps .

other (non BLE) functionality is still running fine.

stepping in the debugger i see no trouble even the connection callback gets called when i try to connect ...

thx, peter

[PSchb.1]

just after posting it looks as if i've find the reason.

it seems to be IOS (my test devices) related :they reported that the BLE device lost pairing information and so refused to connect again.

so, i had to fix this on IOS side. (clear pairing information)

peter