Receving advertisement packets in scanner problem

[mani]

Hi Team,

                Iam doing project called automation of light using BLE technology.

Here Iam using sdk 12.1.0(ble_app_hrs_c) example for scanning or receiving and i flashed the ble_app_hrs_c example in nRF51822 Dk.This nRF51822Dk acting as receiver. I have nrf51822 beacons ,this beacons acting as transmitter.My beacons can advertise every 1000ms and connection interval 500ms.Till now my project is working fine. my question is

1->When i come with multiple beacons(let us consider 4 beacons) near to receiver or scanner ,does (ble_app_hrs_c) example receives all the advertisement packets from all 4 beacons at regular interval of time. 2->Is there any missing of packets at receiver end?? 3->how can i receive all the advertisement packets in scanner ,do i need to change the scanning interval or connecting,non connecting modes ??

[Sigurd]

Yes, the ble_app_multilink_central will continue to scan for advertising packets, even when connected to other peripherals. When only doing advertisement, there is a small chance that an advertisement packet is lost, since the central might be scanning on a different advertising channel when the packet is sent. So if you need that no packets are dropped, you will need to connect with your "beacons" to the central.

In a connection, Bluetooth low energy uses CRC and the packet contains a sequence number and next expected sequence number to ack/nack a packet. Every packet will be acknowledged at the link layer, so if there isn't an acknowledgement, the packet will be retransmitted.

[mani]

Thanks for information. In my project iam using central as ble_app_multilink_central example and peripheral as bel_app_beacon example. Iam receiving the multiple peripheral uuid's and some data from this function on_adv_report(p_ble_evt) located under [BLE_GAP_EVT_ADV_REPORT case] in [ble_app_multilink_central] example.I have to use only this [BLE_GAP_EVT_ADV_REPORT case] while receive the uuid and some data.

My question is ,by doing above modification in source code ,do this central example is still connects to the multiple peripherals ??

Do this central scans on a different advertising channel when the packet is sent??