sd_ble_gattc_write for enabling notification results in busy for second call

[AR]

Hi, I am trying to add a notification charactersitics on client, I am able to add one of them, but when i try to add another one sd_ble_gattc_write(), result is always NRF_ERROR_BUSY. I am calling this cccd_configure() with same conn_handle, respective configuration handles handle_cccd, enable is true.

For the first time cccd_configure() returns success but the second time it returns NRF_ERROR_BUSY. I am not sure why this would happen, i am just enabling the descriptors. Any work around or suggestion would be helpful please.

static uint32_t cccd_configure(uint16_t conn_handle, uint16_t handle_cccd, bool enable) {

uint8_t buf[BLE_CCCD_VALUE_LEN];
buf[0] = enable ? BLE_GATT_HVX_NOTIFICATION : 0;
buf[1] = 0;

const ble_gattc_write_params_t write_params = {
    .write_op = BLE_GATT_OP_WRITE_REQ,
    .flags    = BLE_GATT_EXEC_WRITE_FLAG_PREPARED_WRITE,
    .handle   = handle_cccd,
    .offset   = 0,
    .len      = sizeof(buf),
    .p_value  = buf
};

return sd_ble_gattc_write(conn_handle, &write_params);

}

[Joakim Jakobsen]

Hi AR.
If you take a look at the sd_ble_gattc_write() function in the infocenter, you can read that when the NRF_ERROR_BUSY is returned: For write with response, procedure already in progress. Wait for a BLE_GATTC_EVT_WRITE_RSP event and retry.

[AR]

Thank you, Joakim. That resolved my issue.

[Nikkidutch]

Hello, I am waiting for a BLE_GATTC_EVT_WRITE_RSP and I still encounter the same issue?