This project contains examples and tools for setting up a secure IoT node with IoT Core using the ATECC508A or ATECC608A and WINC1500 with a selection of energy efficent microcontrollers.

Install Zerynth Studio.

• ATECC508A
• ATECC608A

• ATWINC1500 - 802.11 b/g/n Module with integrated TLS 1.2 stack
• ATSAMW25 - Integrated module featuring ATWINC1500 + ATSAMD21G18A + ATECC508A

• ATSAMD21 (ARM Cortex-M0+)
• ATSAMG55 (ARM Cortex-M4)
• ATSAMW25 (ARM Cortex-M0+)

The first step is ensuring that you have a Google Cloud IoT Core account set up with IoT core. The tutorials will walk you through the initial configuration of your account and creation of your first device registry and device.

1. IoT Core Getting Started Guide
2. IoT Core Quick start

Zerynth Python binary can be used to execute the demo custom Python scripts without further dependencies. Run ztc info --tools to retrieve Python path. (e.g. C:\Users\myusername\zerynth2\sys\python\python.exe) Zerynth Python binary called ZERYNTH_PYTHON henceforth.

1. Register and virtualize the device.
2. Run ztc device discover --matchdb to retrieve the device uid.
3. Run ztc device alias put RETRIEVEDUID gcp_board USEDDEVICE, where USEDDEVICE can be one of xplained_samg55, xplained_d21, arduino_mkr1000, to assign the alias gcp_board to the device (--classname ArduinoMKR1000 is also needed for arduino_mkr1000 target).
4. Run ztc provisioning uplink-config-firmware gcp_board --i2caddr 0x0 to prepare the device for provisioning.
5. Run ztc provisioning crypto-scan gcp_board -o . to obtain address and type of the crypto element (stored to configure the application).
6. Run ztc provisioning write-config gcp_board configuration.bin --lock True to write desired configuration to the device. This command LOCKS the crypto element and sets the address to 0x58, this procedure is IRREVERSIBLE
7. Manually reset the device and run again ztc provisioning crypto-scan gcp_board -o . to check if the new address has been assigned and to update scanned info file.
8. Run ztc provisioning gen-private gcp_board 2 to generate a private key inside slot 2 of the crypto element.
9. Run ztc provisioning get-public gcp_board 2 -o devpublic.pem to generate a private key inside slot 2 of the crypto element.
10. Run ZERYNTH_PYTHON kit_provision.py --ssid WIFI-NAME --password WIFI-PSW --device_id DEVID --registry_id REGISTRYID --cloud_region=REGION --project_id=PROJECTID to update the Zerynth project device configuration file.

1. If you have Google Cloud CLI installed and configured on your system simply run gcloud iot devices credentials create --path=devpublic.pem --type=es256 --device=DEVID --region=REGION --registry=REGISTRYID --project=PROJECTID, otherwise manually paste devpublic.pem content in the text box that appears under your device page on Goolge Cloud IoT Core console after pressing Add public key and selecting Enter manually as Input method and ES256 as Public key format.

1. Open Zerynth Studio.
2. From the Device Management Widget switch to Advanced Mode and then back to Auto mode to force alias refresh.
3. Open GoogleCloudConnect project.
4. Open the serial monitor to see, after uplink, if the device successfully connects to the WiFi and to the cloud. Uplink the project.

1. Create a subscription to collect mqtt data into a Google Cloud PubSub queue via gcloud pubsub subscriptions create command or Google Cloud Console.
2. Set Google Cloud credentials for your environment and run ZERYNTH_PYTHON at_gui.py SUBSCRIPTION to see incoming data. Update publish period and led state from the console via device's config.

• Initial release