---
title: "ModBee documentation"
space: "ModBee docs"
url: "https://docs.modbee.org/docs"
updated: "2026-10-25"
---

Hardware notes, setup guides and library references for ModBee. Every page comes straight from the [ModBee repos on GitHub](https://github.com/mod-bee), so the docs keep up with the code.

## Hardware

- [Node UIO](/node-uio): the ESP32-S3 DIN-rail controller: hardware notes, the Arduino library and its API
- [HATs](/hats): CAT SIM7070G, LTE A7670G, LoRa Mesh and PS AC/DC
- [MPPT Charger](/mppt-charger): getting started, hardware, firmware and API
- [Battery Pack 18650](/battery-pack-18650): specifications, cells, protection and safety

## Programming

- [OpenPLC](/openplc): the Node UIO board package and the OpenPLC function blocks

## Libraries

- [MQTT and Sparkplug B](/mqtt): MQTT 5.0 client, broker and bridge, with Sparkplug B
- [BeeBus](/beebus): the peer-to-peer bus for RS485, radio and UDP
- [Modbus](/modbus): non-blocking Modbus RTU, ASCII and TCP
- [Cellular (GSM)](/gsm): SIMCom cellular modems over AT commands
- [OTA updates](/ota): firmware updates over MQTT, with rollback

Products, pricing and enquiries are on [modbee.org](https://modbee.org). ModBee is a trading name of [MR Electrical and Automation](https://mrelectricalandautomation.co.nz).