Notecard API Reference

Notecard Guides

Update Notecard firmware and view release notes for the latest firmware revisions.

Notecard Firmware Updates

Firmware Releases

Firmware Release Policies

DFU with In-Browser Terminal

DFU with Notecard CLI

DFU with STM32CubeProgrammer

OTA DFU with Notehub

The Notecard API is a collection of requests for interfacing with a Blues Notecard.

Overview

The Notecard & Notehub

Learn more about the different Notecard options including functionality by region and network protocol (cellular, Wi-Fi, and LoRa).

Notecard Product Family

The Notecard was designed with simplicity and ease of use as a fundamental goal. As such, the Notecard API exclusively consists of JSON requests to the Notecard and JSON responses from the Notecard.

Notecard Requests & Responses

JavaScript Object Notation, or JSON, is a lightweight format for storing and transporting data of most any kind. It contains 'fields' of your own choosing to convey strings, numbers, boolean values, other JSON objects, and arrays of values

JSON Fundamentals

How the Notecard works with JSON

Requests can be issued to the Notecard over USB, UART, or I2C. The Serial UART interface is fixed at a baud rate of 9600, with eight data bits, no parity bit, and one stop bit (9600/N-8-1).

Notecard Interfaces

When building an embedded application with the Notecard, there are a number of essential API requests to know.

Notecard Walkthrough

Notehub Configuration

Adding Notes to Notefiles

Working with Environment Variables

Interacting with Notehub

Resetting Request Argument Values

Essential Requests

Once the Notecard is connected to a cell network or GPS, there are a number of requests available for obtaining the time, location, and using the onboard GPS module for location tracking.

Time & Location Requests

Obtaining the Current Time and Date

Using Cell Tower & Wi-Fi Triangulation

Working with GPS on the Notecard

Sampling GPS Readings with Periodic Mode

Sampling at Predefined Intervals

Always-on GPS with Continuous Mode

Determining the Current GPS Mode

Geofencing with the Notecard

Disabling GPS

All of the scenarios discussed so far in this guide are focused on performing requests directly against the Notecard from a host, and synching data from the Notecard to Notehub.

Inbound Requests & Shared Data

Sending Data Through Notehub

Creating & Handling Inbound Notes

Using Database Files for Replicated State

Using Change Trackers with Inbound Data

Handling Notecard Interrupts

Miscellaneous File Requests

If your host needs to perform web requests to a 3rd party API or service, the Notecard can facilitate these requests with the web.get, web.put, and web.post requests.

Web Transactions

The Notecard is designed to be battery operated, with low current consumption, making it an ideal choice for low power applications.

Low Power Design

Modem Power Management

Host Power Management

Voltage Monitoring

Motion Monitoring

Customizing Voltage-Variable Behaviors

When building an application that is expected to operate over a long period of time, you'll want to ensure that bandwidth is preserved and monitored, wherever possible.

Low Bandwidth Design

Working with Note Templates

Measuring Data Usage

Data Usage Estimates

Much of the power of the Notecard is in the fact that it can be used by any Host MCU or processor, from an 8-bit Arduino to a Raspberry Pi.

Host Firmware Update Requests

Obtaining Host Firmware Download Status

Entering DFU Mode on the Notecard

Ensuring DFU Mode is Active

Retrieving Host Firmware from the Notecard

Clearing DFU State

The Notecard provides a number of advanced configuration features that you can use to query the state and status of the Notecard, customize its behavior, set its Notehub service location, and configure the available AUX pins for use in your application.

Advanced Notecard Configuration

Issue Maintenance Requests

Change the Notehub Service Host

View and Customize Modem Behavior

Change the Notecard I2C Address

Work with the Notecard AUX Pins

Functions that Require Setting Time

Validate Notecard Responses

Notecard API responses often include a set of error and status codes denoted by curly braces, e.g. `{sync-begin}`. These codes are static and will persist across API versions.

Notecard Error and Status Codes

Error Codes

Status Codes