Environment Variables

Variable reference

Variable	Purpose	First Set In
WIFI_SSID	Wi-Fi SSID used by FIRMWARE FIRMWARE PlatformIO-based ESP32 application in `firmware/` — connects to Wi-Fi, syncs time, and publishes MQTT telemetry and events.	prerequisites/hardware-and-software-requirements
WIFI_PASSWORD	Wi-Fi password used by firmware	prerequisites/hardware-and-software-requirements
THING_NAME	Device identity used in certs and MQTT MQTT Message Queuing Telemetry Transport — lightweight publish/subscribe protocol used between ESP32 and AWS IoT Core. topics	prerequisites/hardware-and-software-requirements
AWS_REGION	AWS AWS Amazon Web Services — the cloud platform used for IoT Core, serverless ingest, storage, API, and hosting in this walkthrough. region for CLI and log lookups	prerequisites/hardware-and-software-requirements
API_URL	Base URL for query API calls	api-and-dashboard/query-api-validation
VITE_API_URL	Dashboard API base URL for local/ AMPLIFY AMPLIFY AWS Amplify — hosts the walkthrough dashboard frontend and connects it to the query API URL. runtime	api-and-dashboard/dashboard-and-hosting
AMPLIFY_APP_ID	Target Amplify app for deploy script	api-and-dashboard/dashboard-and-hosting
AMPLIFY_BRANCH	Amplify branch target for deployment	api-and-dashboard/dashboard-and-hosting
TELEMETRY_TABLE	Runtime shell variable mapped to telemetry DYNAMODB DYNAMODB Amazon DynamoDB — persists telemetry and event records after Lambda ingest in Phase 2. table	infrastructure/terraform-provisioning
EVENTS_TABLE	Runtime shell variable mapped to events DynamoDB table	infrastructure/terraform-provisioning

TELEMETRY_TABLE and EVENTS_TABLE are runtime shell variables derived from TERRAFORM TERRAFORM
HashiCorp Terraform — provisions shared infrastructure (IoT rules fan-out, Lambda, DynamoDB, API Gateway, Amplify). outputs telemetry_table_name and events_table_name.