The first transcontinental telegraph (completed in 1861) was a line that connected an existing network in the eastern United States to a small network in California by a link between Omaha and Carson City via Salt Lake City.
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MQTT v3.1.1 is an OASIS Standard. The specification is available as either single-page HTML or PDF. For historical reference, the previous version of MQTT v3.1 is available here. MQTT-SN v1.2, formerly known as MQTT-S, is available here. MQTT for Sensor Networks is aimed at embedded devices on non-TCP/IP networks, such as Zigbee. MQTT-SN is a publish/subscribe messaging protocol for wireless sensor networks (WSN), with the aim of extending the MQTT protocol beyond the reach of TCP/IP infrastructure for Sensor and Actuator solutions. Read more about it at the IBM Zurich Research website.