Athens, 17 December 2015 Explaining the LoRaWAN advantages and our vision for a grassroot smart city in Athens based on TTN and other open source IoT projects. Slides from presentation: http://www.slideshare.net/ManolisNikiforakis/weatherxm-at-iot-boussias-conference-2015 http://iotconference.boussiasconferences.gr