thethings.iO MQTT uses Message Queue Telemetry Transport. This is a publish-subscribe based "light weight" messaging protocol for use on top of the TCP/IP protocol. It is designed for connections with remote locations where a 'small code footprint' is required and/or network bandwidth is limited. An MQTT Broker is a server where Internet of Things using MQTT can connect. thethings.iO is a enterprise platform and a Internet of Things solution.