.. _mqtt_google_cloud:

nRF9160: MQTT Google Cloud ##################### This application gathers readings from a Bosch BME680 environmental sensor and publishes to a GCP Pub/Sub topic.

Overview

Sensor data is saved in an array of size set in prj.conf. When full, the data is aggregated, a TLS session is established, we authenticate to GC IoT Core and the data is published.

Requirements

• Google Cloud SDK https://cloud.google.com/sdk/docs/#install_the_latest_cloud_tools_version_cloudsdk_current_version
• Python 3
• Segger J-Link debugger

Dependencies

• nrf-sdk v1.3 or newer - tracks master https://github.com/nrfconnect/sdk-nrf/tree/v1.3-branch
• Bosch BSEC library - https://www.bosch-sensortec.com/software-tools/software/bsec/
• nRF91 modem firmware v1.2 https://www.nordicsemi.com/-/media/Software-and-other-downloads/Dev-Kits/nRF9160-DK/nRF9160-modem-FW/mfwnrf9160120.zip
• nRF52 firmware - thingy91_nrf52_usb_uart_bridge_2019-11-29_d3130d77.hex

Getting Started

In prj.conf: set gcloud variables CONFIG_GCLOUD_REGION="" CONFIG_GCLOUD_PROJECT_NAME="" CONFIG_GCLOUD_REGISTRY_NAME="" CONFIG_GCLOUD_DEVICE_NAME=""

• Sign BSEC license agreement and place in nrf/ext folder

• Update BSEC path in prj.conf if BSEC version is different

• Run shell script in src/private_info to generate GC IoT Core certs/ public key sh create_keys.sh

References

gcloud library is based on: https://devzone.nordicsemi.com/cfs-file/__key/telligent-evolution-components-attachments/01-27-00-00-00-00-12-59/nRF9160DKtoGoogleCloud.zip modified for use with new ncs mqtt bindings and compatibility with Thingy91.