Open Source C MQTT Brokers

The AWS IoT Device SDK for Embedded C (C-SDK) is a collection of C source files under the MIT open source license that can be used in embedded applications to securely connect IoT devices to AWS IoT Core. It contains MQTT client, HTTP client, JSON Parser, AWS IoT Device Shadow, AWS IoT Jobs, and AWS IoT Device Defender libraries. This SDK is distributed in source form and can be built into customer firmware along with application code, other libraries, and an operating system (OS) of your choice. These libraries are only dependent on standard C libraries, so they can be ported to various OS's - from embedded Real-Time Operating Systems (RTOS) to Linux/Mac/Windows. You can find sample usage of C-SDK libraries on POSIX systems using OpenSSL (e.g. Linux demos in this repository), and on FreeRTOS using mbedTLS (e.g. FreeRTOS demos in the FreeRTOS repository). The coreHTTP library provides the ability to establish an HTTP connection with a server over a customer-implemented transport layer.

ESP-01, the simplest USD 1.50.- ESP8266 gets a firmware that allows the user to control it by serial port. Therefore it can be used along with any terminal, computer or microcontroller, which is equipped with a serial port (or USB port) -) Connect / disconnect to WiFi and Flespi MQTT broker -) Publish messages -) Subscribe to topics / Unsubscribe from topics -) Read the messages received Furthermore a GUI is on developing process to demonstrate the use. Paypal donations are welcome! reinharddaemon@gmail.com

MQTT-Hyperdash is a fast and efficient dashboard (GUI) for the MQTT framework. It uses the SDL library for graphics rendering, the paho library for communication and the gtk2 framework for user input. The dashboard runs on Linux, but a port to other operating systems is possible. Special features: * Very simple and basic set of base elements. * animated analog input elements, potentiometers. * Fast update rates of 20 Hz are possible. * Easy to use: Each panel/dashboard is configured in a single .dash file. Included are commandline tools to list all topics on a mqtt broker (mqtt-list-topics) and to generate generic dashboard files from the topic lists (hddashgen). Also a highly useful framweork for fast rule engines is included.