BLE central peripheral rssi communication

RE: BLE central peripheral rssi communication

awneil — Tue, 17 Apr 2018 07:05:23 GMT

This sounds similar to my application envisaged here:

https://devzone.nordicsemi.com/f/nordic-q-a/33457/ble-to-ble-peripheral-comms-without-central

[quote userid="66756" url="~/f/nordic-q-a/30340/ble-central-peripheral-rssi-communication"]there will be two nrf52810 chips[/quote]

The trouble with the nRF52810 is that there is only one compatible Softdevice - S112:

http://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.softdevices52%2Fdita%2Fsoftdevices%2Fs130%2Fs130.html

S112 is peripheral only - so the solutions suggested by pavan are not going to work.

RE: BLE central peripheral rssi communication

Joakim Jakobsen — Tue, 20 Feb 2018 09:28:59 GMT

Hi again.

You can start reporting the RSSI on, i.e the event BLE_GAP_EVT_CONNECTED.
You start reporting the RSSI with sd_ble_gap_rssi_start().
This will return a new event whenever the RSSI value changes, until sd_ble_gap_rssi_stop() is called.

After you have started reporting, you can use the function sd_ble_gap_rssi_get(), to get the received signal strenght for the last connection event.

If you want to test this with two nrF52832, you can make a simple example to test this, for example using the uart central and peripheral examples.
Add the RSSI code to the peripheral and send it over uart to the central.

Let me know if you have any questions regarding this.

Best regards,
Joakim.

RE: BLE central peripheral rssi communication

pavan — Fri, 16 Feb 2018 08:36:45 GMT

Hi,

Can please confirm on my above query

RE: BLE central peripheral rssi communication

pavan — Wed, 14 Feb 2018 04:24:39 GMT

Hi,

Thanks for your information.

But how can i read the RSSI value , weather any kind of data transmission possible in this profile? also I want to communicate between 2 controllers(nrf52832) . not between smartphone and device.

Thank you

RE: BLE central peripheral rssi communication

Joakim Jakobsen — Mon, 12 Feb 2018 11:31:51 GMT

Hi pavan!

This should be achievable.
I would suggest that you take a look at the Proximity Profile.
"The Proximity profile defines the behavior when a device moves away from a peer device so that the connection is dropped or the path loss increases above a preset level, causing an immediate alert.
The Proximity profile can also be used to define the behavior when the two devices come closer together such that a connection is made or the path loss decreases below a preset level."

The Proximity Application (ble_app_proximity) is an example in our SDK that implements the Proximity profile.
The applicatoin alerts the user when connected devices are too far apart, but you should be able to use this as a template for your application.

Be sure to let me know if you have any more questions.

Cheers,
Joakim.