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Golioth LightDB Get Sample

Overview

This sample demonstrates how to connect to Golioth and get values from LightDB.

Requirements

  • Golioth credentials
  • Network connectivity

Building and Running

Authentication specific configuration

Golioth offers two authentication methods: Pre-Shared Keys (PSK) or Public Key Cryptography using Certificates (certs). Normally, it is the responsibility of the Golioth SDK user to load these credentials at runtime. For simplicity, we provide facilities to hardcode these credentials or set them at runtime for our samples.

PSK based auth - Hardcoded

Configure the following Kconfig options based on your Golioth credentials:

  • GOLIOTH_SAMPLE_HARDCODED_PSK_ID - PSK ID of registered device
  • GOLIOTH_SAMPLE_HARDCODED_PSK - PSK of registered device

by adding these lines to configuration file (e.g. prj.conf):

CONFIG_GOLIOTH_SAMPLE_HARDCODED_PSK_ID="my-psk-id"
CONFIG_GOLIOTH_SAMPLE_HARDCODED_PSK="my-psk"

PSK based auth - Runtime

We provide an option for setting Golioth credentials through the Zephyr shell. This is based on the Zephyr Settings subsystem.

Enable the settings shell by including the following configuration overlay file:

$ west build -- -DEXTRA_CONF_FILE=${ZEPHYR_GOLIOTH_MODULE_DIR}/samples/common/runtime_settings.conf

Alternatively, you can add the following options to prj.conf:

CONFIG_GOLIOTH_SAMPLE_HARDCODED_CREDENTIALS=n

CONFIG_FLASH=y
CONFIG_FLASH_MAP=y
CONFIG_NVS=y

CONFIG_SETTINGS=y
CONFIG_SETTINGS_RUNTIME=y
CONFIG_GOLIOTH_SAMPLE_PSK_SETTINGS=y
CONFIG_GOLIOTH_SAMPLE_SETTINGS_AUTOLOAD=y
CONFIG_GOLIOTH_SAMPLE_SETTINGS_SHELL=y

At runtime, configure PSK-ID and PSK using the device shell based on your Golioth credentials:

uart:~$ settings set golioth/psk-id <my-psk-id@my-project>
uart:~$ settings set golioth/psk <my-psk>
uart:-$ kernel reboot cold

Certificate based auth - Hardcoded

Configure the following Kconfig options based on your Golioth credentials:

  • CONFIG_GOLIOTH_AUTH_METHOD_CERT - use certificate-based authentication
  • CONFIG_GOLIOTH_SAMPLE_HARDCODED_CRT_PATH - device certificate
  • CONFIG_GOLIOTH_SAMPLE_HARDCODED_KEY_PATH - device private key

by adding these lines to configuration file (e.g. prj.conf):

CONFIG_GOLIOTH_AUTH_METHOD_CERT=y
CONFIG_GOLIOTH_SAMPLE_HARDCODED_CRT_PATH="keys/device.crt.der"
CONFIG_GOLIOTH_SAMPLE_HARDCODED_KEY_PATH="keys/device.key.der"

Platform specific configuration

QEMU

This application has been built and tested with QEMU x86 (qemu_x86).

On your Linux host computer, open a terminal window, locate the source code of this sample application (i.e., samples/lightdb/get) and type:

$ west build -b qemu_x86 samples/lightdb/get
$ west build -t run

See Networking with QEMU on how to setup networking on host and configure NAT/masquerading to access Internet.

ESP32

Configure the following Kconfig options based on your WiFi AP credentials:

  • GOLIOTH_SAMPLE_WIFI_SSID - WiFi SSID
  • GOLIOTH_SAMPLE_WIFI_PSK - WiFi PSK

by adding these lines to configuration file (e.g. prj.conf or board/esp32_devkitc_wroom.conf):

CONFIG_GOLIOTH_SAMPLE_WIFI_SSID="my-wifi"
CONFIG_GOLIOTH_SAMPLE_WIFI_PSK="my-psk"

On your host computer open a terminal window, locate the source code of this sample application (i.e., samples/lightdb/get) and type:

$ west build -b esp32_devkitc_wroom samples/lightdb/get
$ west flash

See ESP32-DEVKITC-WROOM for details on how to use ESP32 board.

nRF52840 DK + ESP32-WROOM-32

This subsection documents using nRF52840 DK running Zephyr with offloaded ESP-AT WiFi driver and ESP32-WROOM-32 module based board (such as ESP32 DevkitC rev. 4) running WiFi stack. See AT Binary Lists for links to ESP-AT binaries and details on how to flash ESP-AT image on ESP chip. Flash ESP chip with following command:

esptool.py write_flash --verify 0x0 PATH_TO_ESP_AT/factory/factory_WROOM-32.bin

Connect nRF52840 DK and ESP32-DevKitC V4 (or other ESP32-WROOM-32 based board) using wires:

nRF52840 DK ESP32-WROOM-32 ESP32-WROVER-32
P1.01 (RX) IO17 (TX) IO22 (TX)
P1.02 (TX) IO16 (RX) IO19 (RX)
P1.03 (CTS) IO14 (RTS) IO14 (RTS)
P1.04 (RTS) IO15 (CTS) IO15 (CTS)
P1.05 EN EN
GND GND GND

Configure the following Kconfig options based on your WiFi AP credentials:

  • GOLIOTH_SAMPLE_WIFI_SSID - WiFi SSID
  • GOLIOTH_SAMPLE_WIFI_PSK - WiFi PSK

by adding these lines to configuration file (e.g. prj.conf or board/nrf52840dk_nrf52840.conf):

CONFIG_GOLIOTH_SAMPLE_WIFI_SSID="my-wifi"
CONFIG_GOLIOTH_SAMPLE_WIFI_PSK="my-psk"

On your host computer open a terminal window, locate the source code of this sample application (i.e., samples/lightdb/get) and type:

$ west build -b nrf52840dk_nrf52840 samples/lightdb/get
$ west flash

nRF9160 DK

On your host computer open a terminal window, locate the source code of this sample application (i.e., samples/ligthdb/get) and type:

$ west build -b nrf9160dk_nrf9160_ns samples/lightdb/get
$ west flash

Sample output

This is the output from the serial console:

[00:00:00.000,000] <inf> golioth_system: Initializing
[00:00:00.000,000] <inf> net_config: Initializing network
[00:00:00.000,000] <inf> net_config: IPv4 address: 192.0.2.1
[00:00:00.000,000] <dbg> golioth_lightdb: main: Start LightDB get sample
[00:00:00.000,000] <inf> golioth_system: Starting connect
[00:00:00.030,000] <inf> golioth_lightdb: Before request (async)
[00:00:00.030,000] <inf> golioth_lightdb: After request (async)
[00:00:00.030,000] <inf> golioth_system: Client connected!
[00:00:00.030,000] <inf> golioth_lightdb: Counter (async)
                                          31 30                                            |10
[00:00:05.040,000] <inf> golioth_lightdb: Before request (sync)
[00:00:05.040,000] <inf> golioth_lightdb: Counter (sync)
                                          31 30                                            |10
[00:00:05.040,000] <inf> golioth_lightdb: After request (sync)
[00:00:10.050,000] <inf> golioth_lightdb: Before request (async)
[00:00:10.050,000] <inf> golioth_lightdb: After request (async)
[00:00:10.050,000] <inf> golioth_lightdb: Counter (async)
                                          31 31                                            |11
[00:00:15.060,000] <inf> golioth_lightdb: Before request (sync)
[00:00:15.060,000] <inf> golioth_lightdb: Counter (sync)
                                          31 32                                            |12
[00:00:15.060,000] <inf> golioth_lightdb: After request (sync)

Set counter value

The device retrieves the value stored at /counter in LightDB every 5 seconds. The value can be set with:

goliothctl lightdb set <device-name> /counter -b 10
goliothctl lightdb set <device-name> /counter -b 11
goliothctl lightdb set <device-name> /counter -b 12