Cellular: Location
The Location sample demonstrates how you can retrieve the location of a device using GNSS, cellular or Wi-Fi positioning method. This sample uses the Location library.
Requirements
The sample supports the following development kits:
Hardware platforms |
PCA |
Board name |
Build target |
Shields |
|---|---|---|---|---|
PCA10153 |
|
|||
PCA10090 |
|
|||
nRF9151 DK |
PCA10171 |
|
When built for an _ns build target, the sample is configured to compile and run as a non-secure application with Cortex-M Security Extensions enabled.
Therefore, it automatically includes Trusted Firmware-M that prepares the required peripherals and secure services to be available for the application.
See also the requirements in Location library document.
Note
This sample uses the nRF Cloud REST API, which requires that your device has a valid signing key installed and registered with nRF Cloud.
(See nRF Cloud REST API and Securely generating credentials for more details on this requirement).
If you are using nRF9160 DK, modem version v1.3.x or later is required. Your nRF9160 DK may ship with modem firmware older than v1.3.x, so verify that you have the latest installed. For an nRF9161 DK, modem version v2.0.0 or later is required.
For instructions on updating your device’s modem firmware, see the following documents:
To obtain and register a valid signing key, you can do one of the following:
Provision your device on nRF Cloud using Just-In-Time Provisioning (JITP) (detailed below).
Provision your device on nRF Cloud with preconnect provisioning (detailed in nRF Cloud Provisioning).
Install or generate a private key on your device and register its public key with nRF Cloud (detailed in Securely generating credentials).
To provision your device on nRF Cloud using JITP, complete the following steps:
Ensure valid nRF Cloud credentials are installed. nRF91 Series DK and Thingy:91 have credentials pre-installed, but some may be shipped with RSA256 credentials; JWT signing requires ES256 credentials. These devices need new credentials to be installed before they can perform REST requests.
Install a sample or application that supports JITP. You can use the Asset Tracker V2 application for this purpose.
Allow your device to connect to nRF Cloud and add it to the nRF Cloud portal. When successfully provisioned, the device appears in the devices list of the nRF Cloud portal.
Once your device is provisioned, you may reinstall this sample and the provisioning persists.
Overview
The Location sample retrieves the location multiple times to illustrate the different ways of retrieving the location of a device. Each individual location request has been implemented in a separate function within the sample. In addition to the Location library, this sample uses LTE link control to control the LTE connection.
Configuration
See Configuring and building an application for information about how to permanently or temporarily change the configuration.
Additional configuration
Refer to the Location library document for configuring the location retrieval behavior, including supported location methods and services.
If you use an external GNSS antenna, add the following configuration:
CONFIG_MODEM_ANTENNA_GNSS_EXTERNAL- Selects an external GNSS antenna.
Configuration files
The sample provides predefined configuration files for typical use cases.
The configuration files are in the samples/cellular/location directory.
The following files are available:
overlay-nrf700x-wifi-scan-only.conf- Config overlay for nRF7002 Wi-Fi chip support.thingy91x-wifi.overlay- DTC overlay for Thingy:91 X Wi-Fi support.overlay-pgps.conf- Config overlay for P-GPS support.
Sending traces over UART on an nRF91 Series DK
To send modem traces over UART on an nRF91 Series DK, configuration must be added for the UART device in the devicetree and Kconfig. This is done by adding the modem trace UART snippet when building and programming.
Use the Cellular Monitor app for capturing and analyzing modem traces.
TF-M logging must use the same UART as the application. For more details, see shared TF-M logging.
Building and running
This sample can be found under samples/cellular/location in the nRF Connect SDK folder structure.
When built as firmware image for the _ns build target, the sample has Cortex-M Security Extensions (CMSE) enabled and separates the firmware between Non-Secure Processing Environment (NSPE) and Secure Processing Environment (SPE).
Because of this, it automatically includes the Trusted Firmware-M (TF-M).
To read more about CMSE, see Processing environments.
To build the sample with Visual Studio Code, follow the steps listed on the How to build an application page in the nRF Connect for VS Code extension documentation. See Configuring and building an application for other building scenarios, Programming an application for programming steps, and Testing and optimization for general information about testing and debugging in the nRF Connect SDK.
nRF91 Series DK with nRF7002 EK Wi-Fi support
To build the sample with nRF91 Series DK and nRF7002 EK Wi-Fi support, use the -DSHIELD=nrf7002ek and -DEXTRA_CONF_FILE=overlay-nrf700x-wifi-scan-only.conf options.
For example:
west build -p -b build_target -- -DSHIELD=nrf7002ek -DEXTRA_CONF_FILE=overlay-nrf700x-wifi-scan-only.conf
Replace the build_target with the build target of the nRF91 Series device you are using (see the Requirements section).
See Providing CMake options for more instructions on how to add these options.
Thingy:91 X Wi-Fi support
To build the Location sample with Thingy:91 X Wi-Fi support, use the -DDTC_OVERLAY_FILE=thingy91x_wifi.overlay and -DEXTRA_CONF_FILE=overlay-nrf700x-wifi-scan-only.conf options.
For example:
west build -p -b thingy91x_nrf9151_ns -- -DDTC_OVERLAY_FILE=thingy91x_wifi.overlay -DEXTRA_CONF_FILE=overlay-nrf700x-wifi-scan-only.conf
See Providing CMake options for more instructions on how to add these options.
P-GPS support
To build the Location sample with P-GPS support, use the following commands:
west build -p -b build_target -- -DEXTRA_CONF_FILE=overlay-pgps.conf
Replace the build_target with the build target of the nRF91 Series device you are using (see the Requirements section).
See Providing CMake options for more instructions on how to add this option.
Testing
After programming the sample to your development kit, complete the following steps to test it:
Connect the kit to the computer using a USB cable. The kit is assigned a COM port (Windows) or ttyACM device (Linux), which is visible in the Device Manager.
Connect to the kit with a terminal emulator (for example, nRF Connect Serial Terminal). See Testing and optimization for the required settings and steps.
Observe that the sample prints to the terminal.
Sample output
An example output of the sample:
Location sample started Connecting to LTE... Connected to LTE Requesting location with short GNSS timeout to trigger fallback to cellular... [00:00:06.481,262] <wrn> location: Timeout occurred [00:00:06.487,335] <wrn> location: Failed to acquire location using 'GNSS', trying with 'Cellular' next Got location: method: cellular latitude: 12.887095 longitude: 55.580397 accuracy: 1250.0 m Google maps URL: https://maps.google.com/?q=12.887095,55.580397 Requesting location with the default configuration... Got location: method: GNSS latitude: 12.893736 longitude: 55.575859 accuracy: 4.4 m date: 2021-10-28 time: 13:36:29.072 UTC Google maps URL: https://maps.google.com/?q=12.893736,55.575859 Requesting location with high GNSS accuracy... Got location: method: GNSS latitude: 12.893755 longitude: 55.575879 accuracy: 2.8 m date: 2021-10-28 time: 13:36:32.339 UTC Google maps URL: https://maps.google.com/?q=12.893755,55.575879 Requesting Wi-Fi location with GNSS and cellular fallback... Got location: method: GNSS latitude: 12.893770 longitude: 55.575884 accuracy: 4.5 m date: 2021-10-28 time: 13:36:45.895 UTC Google maps URL: https://maps.google.com/?q=12.893770,55.575884 Requesting 30s periodic GNSS location... Got location: method: GNSS latitude: 12.893765 longitude: 55.575912 accuracy: 4.4 m date: 2021-10-28 time: 13:36:47.536 UTC Google maps URL: https://maps.google.com/?q=12.893765,55.575912 Got location: method: GNSS latitude: 12.893892 longitude: 55.576090 accuracy: 8.4 m date: 2021-10-28 time: 13:37:17.685 UTC Google maps URL: https://maps.google.com/?q=12.893892,55.576090
Dependencies
This sample uses the following nRF Connect SDK libraries:
In addition, it uses the following secure firmware component: