Zephyr bluetooth central sample fails with error -EAGAIN

[AndyM]

BT central sample has the following code

bt_enable(NULL);

bt_le_scan_start(SCAN_PASSIVE, device_found);    

I ran the sample on my custom board based on nRF52840 and it always returns -EAGAIN even if I put the bt_le_scan_start in a loop and wait 1000 ms between attempts

I looked in the bt_le_scan_start function in scan.c

It returns -EAGAIN if BT_DEV_READY flag is not set:

if (!atomic_test_bit(bt_dev.flags, BT_DEV_READY)) {

        return -EAGAIN;

    }

Any ideas why this flag is never set? bt_enable does not return an error and is called synchronously

Project settings
-------------------------

CONFIG_BT=y

CONFIG_BT_CENTRAL=y

CONFIG_BT_OBSERVER=y

CONFIG_BT_BROADCASTER=y

CONFIG_BT_MESH=y

CONFIG_BT_MESH_RELAY=y

CONFIG_BT_MESH_SUBNET_COUNT=1

CONFIG_BT_MESH_APP_KEY_COUNT=1

CONFIG_BT_MESH_MODEL_GROUP_COUNT=2

CONFIG_BT_MESH_ADV_BUF_COUNT=10

CONFIG_BT_MESH_LABEL_COUNT=0

CONFIG_BT_MESH_PB_ADV=n

CONFIG_BT_MESH_CFG_CLI=y

CONFIG_BT_MESH_LOOPBACK_BUFS=8

CONFIG_BT_SETTINGS=y

CONFIG_FLASH=y

CONFIG_FLASH_PAGE_LAYOUT=y

CONFIG_FLASH_MAP=y

CONFIG_NVS=y

CONFIG_SETTINGS=y

CONFIG_BT_MESH_RPL_STORE_TIMEOUT=600

--------------------------------------------------------

Thank you

Andy

[AndyM]

Update

1. Calling bt_enable from a thread crashes the program - is this expected?

2.Enabled logging, called from main thread, see this  message after bt_enable

[00:01:03.757,263] <inf> sdc_hci_driver: SoftDevice Controller build revision:
0e e7 c5 66 67 18 3c ac b3 d2 cc 81 a3 dc f1 c0 |...fg.<. ........
c0 36 02 22 |.6."
[00:01:03.763,702] <inf> bt_hci_core: No ID address. App must call settings_load()

Perhaps this is a clue.

Any ideas?

Thanks

[AndyM]

I'll try that. Keep in mind that the thread that crashes calls bt_enable ( which starts many threads) and bt_le_scan_start 

[AndyM]

Plus there is already another thread running in addition to the main thread, with the same stack size 1024