Everyday a new Smart City project is announced. Streetlights are getting more and more connected to save energy and increase quality of lighting services in the streets. Waste containers are being monitored to reduce trucks traffic and still help cities to get cleaner. Parking availabilities are detected to reduce pollution and adjust pricing depending on the offer / demand and environmental sensors measure pollution data. But still, most of the available solutions are proprietary, locking cities in single vendor solutions. TALQ developed an open Smart City Protocol. Thanks to the TALQ Specification, cities can now chose and adopt interoperable solutions which are compatible with multiple vendors e.g. of smart streetlights, smart waste and parking sensors, all controlled by a single central management system. This presentation aims at educating cities and solution providers about the technical specifications of such a protocol, the way to implement it and the benefits to adopt it.