How to know location using LNS(location and Navigation Service) sdk example? speed and location are combined and encrypted

RE: How to know location using LNS(location and Navigation Service) sdk example? speed and location are combined and encrypted

Petter Myhre — Wed, 05 Oct 2016 12:26:47 GMT

You can decode using Chapter 3.2 in the LNS spec, and this.

When you enable the notifications you will receive the initial values for the characteristic (examine initial_lns_location_speed in the code).

In nRF Connect you will receive:

Attribute value changed, handle: 15, value (0x): 07-02-0C-00-34-09-00-2C-76-DA-F9-22-1D-D6-23

The first 16 bits are the flag field. The first 6 bits tells you what fields that are present.

0x07 = 0b00000111 -> Instantanours Speed, Total Distance, Location present

0x02 = 0b00000010 -> Speed and Distance format is 3D

The next 16 bits is the instantaneous speed (0x000C)

The next 24 bits is the total distance (0x000934)

The next 32 bits is the location - latitude (0xF9DA762C)

The next 32 bits is the location - longitude (0x23D61D22)

RE: How to know location using LNS(location and Navigation Service) sdk example? speed and location are combined and encrypted

Webmobi — Wed, 05 Oct 2016 09:44:29 GMT

in code all values(battery,latitude and longitude,speed, navigation, and positional quality) is initialized. this values are transmitted. battery value is incremented or decremented 1 and speed is increased 1.2m every time

RE: How to know location using LNS(location and Navigation Service) sdk example? speed and location are combined and encrypted

Petter Myhre — Tue, 04 Oct 2016 16:58:10 GMT

What did you understand?

RE: How to know location using LNS(location and Navigation Service) sdk example? speed and location are combined and encrypted

Webmobi — Tue, 04 Oct 2016 16:08:33 GMT

I try to do it, I only understood partially. Can u help me with it.

RE: How to know location using LNS(location and Navigation Service) sdk example? speed and location are combined and encrypted

Petter Myhre — Tue, 04 Oct 2016 12:09:27 GMT

Have you read the spec and/or examined the code?

RE: How to know location using LNS(location and Navigation Service) sdk example? speed and location are combined and encrypted

Webmobi — Tue, 04 Oct 2016 05:12:15 GMT

when i load the lns example into nordic kit and use nordic connect app to read the data sent using beacons, we can read location and speed, navigation,LN connect. how to calculate location , speed and location is combined and in hex format

RE: How to know location using LNS(location and Navigation Service) sdk example? speed and location are combined and encrypted

Petter Myhre — Mon, 03 Oct 2016 11:19:34 GMT

I don't understand. Could you edit your question and elaborate on what you want to achieve? The spec and the code should explain how to interpret the location and speed characteristic value. I don't see what encryption has to do with this.