nRF52840 out of BLE range notification

[Xing_2021]

Hello! I am using nRF52840 develop product. When nRF52840 circuit board has been moved away from the cell phone and is out of the BLE range, I want to send message via UART ports to external ICs. What internal function of 52SDK I can use when this event happen? I actually use HRS example to do the experiment, I found it show: Disconnected, reason 8. It means nRF52840 can differentiate the disconnection scenarios. Could you let me know which internal function I can use to achieve this design?

[haakonsh]

You want to look for the BLE_HCI_CONNECTION_TIMEOUT ('reason 8'). It notifies the application that the peer did not respond within the set Supervisory Timeout and the connection was broken. 

[Xing_2021]

Hi, haakonsh, Thank you for reply! You are right,ble_hci.h show different status code Macro definition. Therefore, which function in main.c in ble_peripheral/hrs example will call it? I want to achieve something like: if (disconnection_reason == 0x08) {/*send message via UART*/}. There, disconnection_reason should be some return by some function in SDK. Could you advise it? 

[Jared]

A disconnection will generate an BLE_GAP_EVT_DISCONNECTED event in the ble event handler in the hrs example.