sd_ble_gatts_hvx returns NRF ERROR RESOURCES while transferring bytes

RE: sd_ble_gatts_hvx returns NRF ERROR RESOURCES while transferring bytes

Hung Bui — Wed, 29 Dec 2021 15:35:58 GMT

I'm afraid not. You may need to count the number of available buffer by using the BLE_GATTS_EVT_HVN_TX_COMPLETE event and the number of packet sent provided in the callback event:

* @note The application can keep track of the available queue element count for notifications by following the procedure below:
* - Store initial queue element count in a variable.
* - Decrement the variable, which stores the currently available queue element count, by one when a call to this function returns @ref NRF_SUCCESS.
* - Increment the variable, which stores the current available queue element count, by the count variable in @ref BLE_GATTS_EVT_HVN_TX_COMPLETE event.

RE: sd_ble_gatts_hvx returns NRF ERROR RESOURCES while transferring bytes

sowmiya — Wed, 29 Dec 2021 14:09:36 GMT

is there a way to check queue size of notifications in BLE_GATTS_EVT_HVN_TX_COMPLETE ?

RE: sd_ble_gatts_hvx returns NRF ERROR RESOURCES while transferring bytes

Hung Bui — Wed, 29 Dec 2021 13:19:17 GMT

Hi Sowmiya,

When you receive NRF ERROR RESOURCES you should follow what suggested in the documentation of sd_ble_gatts_hvx() : "Too many notifications queued. Wait for a @ref BLE_GATTS_EVT_HVN_TX_COMPLETE event and retry."

Increasing NRF_SDH_BLE_GAP_EVENT_LENGTH won't help fix the issue, especially if the connection interval is smaller than NRF_SDH_BLE_GAP_EVENT_LENGTH .