GSM

The Challenge: Beyond Simple Switching In 2010, the demand for remote management evolved from simple power cycling to complex telemetry. While working with high-end Swedish Swegon ventilation units, I faced a challenge: providing remote access to deep system parameters that weren’t accessible through standard add-ons at the time. The Solution: Bridging GSM and Modbus RTU I developed a solution that allowed my GSM gateway to communicate directly with Swegon’s internal controllers via the Modbus RTU protocol (RS-485). This was more than just a switch; it was an early IoT bridge: Protocol Engineering: I mapped the unit’s internal registers to SMS commands and status reports. Deep Integration: Users could not only start the system but also monitor temperatures, airflows, and sensor data remotely. Reliability: The system maintained the strict industrial standards required for climate control in commercial buildings. Professional Integrity and Innovation This project was implemented during my collaboration with a Swegon dealer. While the specific hardware and proprietary firmware remain with the client, the core achievement was the successful marriage of mobile connectivity and complex industrial protocols. It proved that even “closed” high-end systems can be made more transparent and manageable through smart, reliable opensource-based approaches. This project marked my transition from standalone devices to Industrial IoT, where the quality of communication and data integrity is paramount. ...

The Challenge: Remote Management in the Pre-IoT Era From 2006 to 2011, during the rise of mobile connectivity, there was a critical need for simple, fail-safe remote control of large-scale infrastructure. Businesses needed a way to reset power, disable leased equipment (like elevators), or monitor scientific sensors in remote maritime locations without expensive satellite links. The Solution: The GSM Switch Series I developed a line of independent GSM-controlled devices from scratch — from initial concept and PCB design to firmware development and final sales. These devices were built to do one thing perfectly: execute commands via SMS with 100% reliability. ...