Getting error code 4 while trying to initialize device information services repeatedly from main

RE: Getting error code 4 while trying to initialize device information services repeatedly from main

Hung Bui — Wed, 15 Jul 2020 09:12:35 GMT

Hi Amit,

Could you explain why you want to call ble_dis_init() 4th time ?
The way our softdevice designed, it's only possible to add service/characteristic, but not to remove them.
You can also think of having the characteristic reside in the user memory instead of stack memory (is_value_user=1)

RE: Getting error code 4 while trying to initialize device information services repeatedly from main

Amit Kanade — Wed, 15 Jul 2020 08:17:10 GMT

Hello,

Actually i am also getting the same problem and as you suggested increase the NRF_SDH_BLE_GATTS_ATTR_TAB_SIZE so i increase it from 1408 to 1600( in bytes ).

After changing the NRF_SDH_BLE_GATTS_ATTR_TAB_SIZE still it gives error code 4 but this time it goes in error when i try to call "ble_dis_init" function 4th time.

i investigate the error and find that it gives the error in "char_add" function

    // Add characteristics
    if (p_dis_init->manufact_name_str.length > 0)
    {
        err_code = char_add(BLE_UUID_MANUFACTURER_NAME_STRING_CHAR,
                            p_dis_init->manufact_name_str.p_str,
                            p_dis_init->manufact_name_str.length,
                            p_dis_init->dis_char_rd_sec,
                            &manufact_name_handles);
        if (err_code != NRF_SUCCESS)
        {
            return err_code;
        }
    }

so according to me when we are repeatedly calling the dis service init, attributes are created in database and when it reaches maximum attribute tab size which we are giving by NRF_SDH_BLE_GATTS_ATTR_TAB_SIZE macro, code gives NO_MEMORY ERROR

is there any way to delete the attribute which is created in database at the time of dis service initialization, so we will delete that at the time of uninit of dis service.

RE: Getting error code 4 while trying to initialize device information services repeatedly from main

Hung Bui — Tue, 14 Jul 2020 13:46:22 GMT

Hi KRA,

Error 4 means NRF_ERROR_NO_MEM most likely thrown by sd_ble_gatts_service_add() inside ble_dis_init() in ble_dis.c
You would need to increase the NRF_SDH_BLE_GATTS_ATTR_TAB_SIZE since you have added more service into the softdevice's attribute table.