---
title: 'Blues Developers: Cellular, Satellite, LoRa & WiFi IoT'
description: Tutorials, SDKs, and docs for Blues Notecard - your IoT connectivity choice for LTE Cat-1, Cat-1 bis, LTE-M, NB-IoT, Satellite, LoRa, and WiFi.
source_url: https://dev.blues.io
canonical_url: https://dev.blues.io
markdown_url: https://dev.blues.io/index.md
---

# Blues Developers

This is the markdown version of the [Blues developer site homepage](https://dev.blues.io).
Blues makes wireless IoT connectivity simple: Notecard is a system-on-module that adds cellular, satellite, LoRa, or WiFi connectivity to any product, and Notehub is the cloud service that securely routes Notecard data to your cloud application.

This site (dev.blues.io) is the Blues developer hub — documentation,
datasheets, and API references. [blues.com](https://blues.com)
is the flagship Blues marketing site, for product overviews, customer
stories, and company information.

## When to use this site

- Adding wireless connectivity (Cellular, Satellite, LoRa, or WiFi) to an embedded device or connected product.
- Writing firmware that talks to a Notecard — its JSON API over Serial, I2C, or UART, with libraries for Arduino, C/C++, Zephyr, and Python.
- Routing device data through Notehub to a cloud application, or calling the Notehub REST API at https://api.notefile.net (OpenAPI spec: https://dev.blues.io/openapi.json).
- Looking up Notecard, Notecarrier, Swan, Cygnet, or Starnote hardware datasheets, pinouts, and certifications.

## How agents should read this site

- [llms.txt](https://dev.blues.io/llms.txt) — curated index of every documentation
  page's plain-markdown version.
- Append `.md` to any documentation page URL for its markdown twin (for
  example `/quickstart/notecard-quickstart.md`), or request the page URL
  with an `Accept: text/markdown` header.
- [llms-full.txt](https://dev.blues.io/llms-full.txt) — single-file concatenation of
  the documentation, for bulk ingestion.
- [openapi.json](https://dev.blues.io/openapi.json) — OpenAPI 3 specification for
  the Notehub API.
- [/.well-known/mcp.json](https://dev.blues.io/.well-known/mcp.json) — MCP discovery
  metadata for Blues Expert MCP.

## MCP servers

- [Blues Expert MCP](https://dev.blues.io/tools-and-sdks/generative-ai-tools/blues-expert-mcp/) — MCP for Blues documentation, Notecard API validation, and firmware development guidance. Streamable HTTP endpoint `https://mcp.blues.io/expert/mcp` (no authentication required).
- [Notehub MCP](https://dev.blues.io/tools-and-sdks/generative-ai-tools/notehub-mcp/) — MCP for querying your product data in plain language and getting answers drawn from the Notehub data you already collect (a.k.a. Notehub IQ). Streamable HTTP endpoint `https://mcp.notehub.io/mcp` (requires signing in to your Notehub account).

## Start here

- [Blues Docs](https://dev.blues.io/docs.md): documentation home.
- [Quickstart](https://dev.blues.io/quickstart.md): set up a Notecard and send data to the cloud in minutes.
- [API reference](https://dev.blues.io/api-reference.md): every Notecard and Notehub API request, with examples.
- [Datasheets](https://dev.blues.io/datasheets.md): hardware specifications.
- [Example apps](https://dev.blues.io/example-apps.md): open-source sample projects and accelerators.
- [Support](https://dev.blues.io/support.md): how to get help from Blues.