Overview of Environment Variables and how to use them

Understanding Environment Variables

Learn the Notecard API and sync data between the Notecard and Notehub

Quickstart

Introduction

Before You Begin

Set up Notehub

Set up Notecard

Queue Notes to your Notecard

Send Notes from Notecard to Notehub

View Notes on Notehub

Send Notes from Notehub to Notecard

Next Steps

Build an MCU-controlled application that reads from an external sensor and sends readings to the Notecard

Sensor Tutorial

Set up Hardware

Create a Notehub Project

Write Firmware

View Data in Notehub

Learn how to connect Notecard applications to third-party cloud services using Notehub Routes

Route Tutorial

Create a Route

Use JSONata to Transform JSON

Route to an External Service

Build Data Visualizations

Tutorials

Guide for creating Notehub Routes to MQTT services

MQTT Route

Guide for creating Notehub Routes to Azure Functions

Azure Function Route

Guide for creating Notehub Routes to ThingWorx

ThingWorx Route

Routing Guides

Asset Tracking

What You Need to Get Started

Tracker Configuration Requests

Configure a Standalone Tracker

Configure a Host-Controlled Tracker

Viewing Tracker Data

Routing Tracker Data to Third-Party Services

Serial-Over-I2C Protocol

What is I2C

Transaction Structure

Data Query

Data Read

Data Write

Transaction Walkthrough

Guide for using Notehub and the Notecard for performing Host firmware updates

Updating Host Firmware

Preparing the Arduino IDE

Overview of the Host DFU Process

Adding DFU Capabilities to Firmware

Creating a Firmware Revision

Initiating a Host DFU from Notehub

Tracking DFU Progress

Updating ESP32 Host Firmware

The Hierarchy of Environment Variables

Setting Environment Variables

Deleting Environment Variables

Notecard Guides