ESP32 Forum

I am trying to set up multiple advertisements using NimBLE on ESP32-C3 but I receive error 0x207 (BLE_ERR_MEM_CAPACITY) when I set up the third advertising. I have set the following configuration:

CONFIG_BT_NIMBLE_EXT_ADV=y
CONFIG_BT_NIMBLE_MAX_EXT_ADV_INSTANCES=4

Using ESP-IDF v5.1.5. The example ble_multi_adv runs fine, but I am using many more resources (GATT server, BLE scanning, wifi, etc..).

Do I need to increase memory somewhere? Any hints?

It seems to have to do with the advertising parameters (ble_gap_ext_adv_params).

Is there a limit to the combinations of connectable, scannable, and legacy_pdu combinations?

Can you share your sample application or console log to narrow down which function is returning this error. Also, can you share your complete sdkconfig ?

You can try and change the "Memory Settings" for NimBLE via menuconfig, e.g. adding more "blocks" to one or more of the memory pools.

The function returning the error is ble_gap_ext_adv_start(). I attached the sdkconfig.

I doubled MSYS_1 Block count from 24 to 48 and MSYS_2 Block count from 32 to 64 without any success

I could solve this by setting CONFIG_BT_CTRL_BLE_MAX_ACT=9

I wonder why 9? I would assume I need 7: 4x adv + 1x scan + 1x central + 1x periph