Notify Enable problem

[Yinbun Ye]

Hi,

    I want to directly enable notify without discovering the service handle, but it didn't work(return NRF_ERROR_BUSY).
    Because it takes time to discover the service, and I need to communicate as soon as possible after connecting

[Vidar Berg]

Hi,

NRF_ERROR_BUSY indicates that another write request procedure is ongoing and that you need to wait for it to complete first (completion signaled through BLE_GATTC_EVT_WRITE_RSP). So I think it's timing related and not that you're using a hardcoded attribute handle. 

Optional: with SDK 16 you can use the BLE GATT Queue module to enqueue the write request. 

API reference: sd_ble_gattc_write and the MSC: GATTC Characteristic or Descriptor Value Write

[Yinbun Ye]

thx Vidor Berg, thx for your reply