Getting Started with MetricMQ

01 Jul 2026 in Blog / Embedded Software , Tags: C++

MetricMQ is a 328 KB C++20 message broker built from scratch and still under development. It features a custom binary wire protocol, Ed25519 message signing enforced at the wire level, exactly-once delivery using sequence IDs with LMDB persistence, Prometheus metrics on every message path, and a native ESP32 Arduino client. This page shows the broker running four demos, each highlighting a different capability with live Prometheus metrics you can watch in real time.

About

I’m a software engineer working primarily in embedded systems and firmware, with experience spanning resource-constrained devices, embedded Linux, and desktop applications. I hold an MSc in Embedded Systems from Kingston University, London, UK with management studies as my minor subject, this educational experience has shaped how I approach engineering decisions beyond just code.

I use this space as a technical notebook and reflection log: to write about firmware, software design, testing strategies, systems thinking, and lessons learned from building software that runs close to hardware. Occasionally, I also share personal interests and side projects, including leisure work I pursue in my free time.

Getting Started with MetricMQ on ESP32

MetricMQ is a 328 KB C++20 message broker built from scratch and still under development. In this blog post the metricmq is demostrated on the Esp32-s3 N16R8 Module

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Getting Started with MetricMQ

Saptarshi Nag

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