Golioth Hello sample

Overview#

This sample application demonstrates how to connect with Golioth and publish simple Hello messages.

Requirements#

  • Golioth credentials
  • Network connectivity

Building and Running#

Configure the following Kconfig options based on your Golioth credentials:

  • GOLIOTH_SYSTEM_CLIENT_PSK_ID - PSK ID of registered device
  • GOLIOTH_SYSTEM_CLIENT_PSK - PSK of registered device

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

CONFIG_GOLIOTH_SYSTEM_CLIENT_PSK_ID="my-psk-id"
CONFIG_GOLIOTH_SYSTEM_CLIENT_PSK="my-psk"

Platform specific configuration#

QEMU#

This application has been built and tested with QEMU x86 (qemu_x86) and QEMU ARM Cortex-M3 (qemu_cortex_m3).

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

$ west build -b qemu_x86 samples/hello
$ 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.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/hello) and type:

$ west build -b esp32 samples/hello
$ west flash

See ESP32 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

P1.01 (RX) IO17 (TX)

P1.02 (TX) IO16 (RX)

P1.03 (CTS) IO14 (RTS)

P1.04 (RTS) IO15 (CTS)

P1.05 EN

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/hello) and type:

$ west build -b nrf52840dk_nrf52840 samples/hello
$ west flash

Sample output#

This is the output from the serial console:

[00:00:00.000,000] <inf> golioth_hello: Initializing golioth client
[00:00:00.000,000] <inf> golioth_hello: Golioth client initialized
[00:00:00.000,000] <inf> golioth_hello: Sending hello! 0
[00:00:00.000,000] <wrn> golioth_hello: Failed to send hello!
[00:00:00.000,000] <inf> golioth_hello: Starting connect
[00:00:00.000,000] <inf> golioth_hello: Client connected!
[00:00:05.010,000] <inf> golioth_hello: Sending hello! 1
[00:00:05.020,000] <dbg> golioth_hello: Payload
48 65 6c 6c 6f 20 6d 61 72 6b |Hello ma rk
[00:00:10.030,000] <inf> golioth_hello: Sending hello! 2
[00:00:10.030,000] <dbg> golioth_hello: Payload
48 65 6c 6c 6f 20 6d 61 72 6b |Hello ma rk

Responses to Hello messages are printed above as a hexdump of \"Hello mark\". This means that communication with Golioth is working.