ble notification will be delayed by one connect interval(with ble_app_uart example)

[William.wei]

hi support team,

customer has one question about about sd_ble_gatts_hvx notify API, found that this data is not sent out immediately, but there is one connect interval delay.

we use nrf_gpio_pin_set(pin) to indicate send and nrf_gpio_pin_clear(pin) in on_hvx_tx_complete callback, find out that this problem?

may i ask how to explain this ?

however, if i call this api twice, the data will be pushed out when next connection interval arrives.

Regards,

William.

[Amanda Hsieh]

Hi, 

See this post: 

"BLE_GATTS_EVT_HVN_TX_COMPLETE occurs when a notification is acked on the link layer. So this usually requires 2 connection events. The first one is for the peripheral to send the packet and the next one is when the packet ACKed by the central. "

Regards,
Amanda

[William.wei]

ok, thanks.