Notify Enable problem

Question

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 · Accepted Answer

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

Notify Enable problem

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