MQTT Jobs

I need an end-to-end solution that lets me monitor and, when necessary, remotely control a set of environmental sensors that report temperature, humidity, and air-quality data. Here is the flow I am envisioning: the sensors push readings to the cloud (MQTT, HTTPS, or another lightweight protocol you prefer), the data is stored and processed, and a desktop application then visualises the live feed, keeps historical logs, and lets me define threshold-based actions. Key points I care about • Real-time monitoring and control is the primary goal—latency needs to be kept low and reconnect logic must be solid. • Sensors involved: temperature, humidity, and air quality. The system should be flexible enough to add more sensor types later without a rewrite. • Desktop side...

I’m building a smart irrigation setup that links a Raspberry Pi edge server with several ESP32 nodes in the field. Each ESP32 gathers data from soil-moisture probes, compact weather boards (temperature, humidity, barometric pressure), and inline flow meters, then reports everything wirelessly to the Pi for processing. Here’s what I need from you: • Python (Raspberry Pi) and MicroPython/C++ (ESP32) code that ingests the raw sensor streams, pushes them through an on-device model, and decides—within seconds—whether to start or stop the main pump and which solenoid valves to open. • An ML pipeline: training notebooks, a lightweight model (TensorFlow Lite or similar) and the inference wrapper that runs locally. The model must act on current soil-moisture rea...

Project Overview We are developing a production-grade ESP32-S3 based IoT pulse controller for self-service car wash and vacuum stations. The device receives payment commands via MQTTS or HTTPS and generates configurable “coin pulses” through dry contact and open-collector outputs into industrial controllers. The device operates in noisy industrial electrical environments (heavy motors, high-pressure pumps, and high current loads). We require high-reliability firmware that ensures 100% financial transaction integrity and extreme long-term stability. Scope of Work The selected engineer will deliver firmware with the following capabilities: • Precision Pulse Engine: Non-blocking, deterministic control of PhotoMOS SSR, Mechanical Relay (SPDT), and Opto-isolated Open-C...

Embedded Firmware Engineer (ESP32-S3, MQTT/HTTPS, OTA, Local Installer Wizard) – Industrial Pulse Controller Description We are building an industrial Wi-Fi “pulse injector” controller (Payter/Nayax-like) for self-service car wash / vacuum stations. Customer scans a QR on the bay, opens our webapp, pays online, and the device generates configurable “coin pulses” (dry contact and open-collector) into the wash/vac controller. We need an experienced embedded engineer to deliver production-grade firmware for ESP32-S3 with: • Reliable Wi-Fi connectivity and auto-recovery • MQTT (preferred) or HTTPS command channel • Configurable pulse generation (timing, mapping, NO/NC/OC outputs) • Local Installer Wizard (AP mode + web UI) • Heartbeat/stat...

Project Brief: Industrial 230V ESP32-C3 Toshiba AC Gateway & I/O Controller 1. Project Overview Design and develop a production-ready, CE-compliant, DIN-rail mounted (EN 60715) industrial controller for Toshiba AC systems. The device serves as a Master Gateway bridging three domains: • Toshiba AB Protocol – Galvanically isolated UART interface to AC indoor units • Modbus RTU (RS-485) – Expansion bus for modular field I/O (relays, temperature, analog modules) • Local Analog I/O – 0–10 V interfaces for direct HVAC integration The system must be stable, thermally suitable for sealed enclosures, and follow Screaming Architecture principles for long-term maintainability. 2. Hardware Specifications Power & Safety • Integrated ...

I want the running total revenue from my Shopify store to show on a Wi-Fi-enabled physical counter that sits on my desk. The job is to build the small bridge between Shopify’s JSON API and the hardware. Here’s what I already have and what I need from you: • Data source – Shopify: I only care about the store’s Total revenue figure. A lightweight call to the REST Admin API (or GraphQL if you prefer) is enough. I will supply the private-app credentials. • Destination – Hardware counter: It connects over Wi-Fi. You can target it with plain HTTP, WebSocket, or MQTT; whichever is simplest to flash onto a common ESP8266/ESP32 controller. I can handle the flashing if you give me the compiled binary or the Arduino/PlatformIO project. • Service layer:...

looking for an experienced OT / Industrial IIoT freelancer to develop a small on-premise technical demo (PoC) related to an automotive Paint Shop (Pre-Treatment & E-Coat). The goal is to demonstrate a realistic Industry 4.0 data flow, fully on-premise, without modifying PLC control logic, and aligned with industrial cybersecurity best practices.