The first message ever sent across the network that became the internet was not a grand declaration. It was two letters: "LO". Not a word anyone chose, not a slogan, just the first half of a login command that never finished because the system crashed. More than fifty years later, that accidental fragment is one of the best origin stories in computing, and it still has something to teach anyone building connected devices today.
The night of 29 October 1969
At around 10:30 in the evening on 29 October 1969, a student programmer named Charley Kline sat at a computer in Leonard Kleinrock's lab at UCLA. His job was to log in to a second machine roughly 350 miles away at the Stanford Research Institute (SRI) in Menlo Park, California. The two computers were among the first nodes of ARPANET, the U.S. Defense Department research network that would eventually grow into the internet.
Kline started typing the command LOGIN. To make sure the letters were arriving, he had a colleague at SRI on the phone confirming each keystroke. He typed L, and Stanford confirmed the L. He typed O, and Stanford confirmed the O. Then he typed G, and the SRI machine crashed.
So the very first message transmitted over ARPANET was the truncated, unintentional "LO". Kleinrock has enjoyed pointing out for decades that they could not have scripted anything better: the first word on the internet was "lo," as in "lo and behold." A little over an hour later, after the bug was fixed, Kline completed a full login, but the accidental version is the one history remembers.
Why a crash matters more than a clean success
It is tempting to treat "LO" as a cute footnote, but the crash is the useful part. ARPANET was not built to be reliable on day one. It was built to discover how to be reliable. Everything we now take for granted about networking, error handling, retransmission, acknowledgements, graceful recovery, exists because early links failed constantly and engineers had to design around failure rather than assume it away.
That lesson has not aged. If you build connected hardware today, the network is still the part most likely to disappoint you. A sensor node on a factory floor loses Wi-Fi. A cellular module drops a packet mid-transmission. A cloud endpoint times out at exactly the wrong moment. The teams that ship dependable products are the ones who assume the "G" will crash the system eventually, and design for it.
The line from ARPANET to modern IoT
ARPANET introduced packet switching, the idea of breaking a message into small chunks that each find their own way across the network and reassemble at the other end. That principle underpins TCP/IP, which underpins the web, which underpins the protocols that IoT devices lean on every day: MQTT, CoAP, HTTP, and WebSocket all ride on the same packet-switched foundation first tested that night in 1969.
For an embedded engineer, this is more than trivia. When your ESP32 publishes a temperature reading to an MQTT broker, it is participating in a direct descendant of the ARPANET experiment. The retry logic in your firmware, the quality-of-service level you pick, the reconnect handler you write after a dropped connection, all of it is the modern expression of the problem Charley Kline hit head-on when the SRI machine went down.
Building for the real network, not the ideal one
The practical takeaway for anyone prototyping IoT or web-connected hardware is simple: treat the network as hostile by default. Buffer readings locally so a dropped connection does not lose data. Use protocols like MQTT that were designed for unreliable, low-bandwidth links. Test your device on a bad connection on purpose, not just on the fast office Wi-Fi. The "happy path" where every packet arrives is the exception, not the rule.
This is the kind of thinking that separates a demo that works once from a product that works in the field. In the Philippines especially, where a connected device might sit on spotty mobile data or a congested shared network, designing for the "LO" moment, the point where the link fails, is what makes hardware trustworthy.
At Fluidwire we prototype IoT and embedded systems from silicon to cloud, and reliable networking is at the center of almost every build. If you have a thesis project or a product idea that needs to talk to the internet and keep talking to it when conditions get rough, get in touch and we can help you build it properly.
The internet started with a crash and two stray letters. Every robust connected device since has been an answer to that first failure.
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