about ble_gatts_hvx

[Stayhungry]

I'm doing experiments on high throughput and need to call sd_ble_gatts_hvx, but there are a lot of confusing things so it's hard to get started.

If I want to know if notify is successful, which of the following events are likely to occur and I should be concerned

1, when returning NRF_SUCCESS, it must be sent successfully, if LL layer packet loss occurs, softdevice will automatically reissue until the successful sending will return BLE_GATTS_EVT_HVN_TX_COMPLETE event

2, when returning NRF_SUCCESS, it may also send failure, if LL layer packet loss occurs, softdevice does not automatically re-send, but will also send BLE_GATTS_EVT_HVN_TX_COMPLETE event to the user, and modify p_hvx_params-> p_len

3, when returning NRF_SUCCESS, it is possible to write only part of the data to the softdevice, this time to check p_hvx_params-> p_len to see the true length of the data written to the softdevice, and then follow the case1 process

Thanks

[RK]

The answer is 1). If NRF_SUCCESS is returned, the packet WILL be delivered to the other side (unless the entire link times out and you disconnect).

[Stayhungry]

Hi,RK. Suddenly I think of another question, tx buffer buffer only pointer, or buffer data which pointer pointing ? After I receive NRF_SUCCESS, can I modify the memory pointed to by the pointer?