The first is called a client pull, and it means a browser or app is requesting data from a server. There are two primary ways to handle data delivery. Here's an example of a new EventSource object set up to receive events from a server: How Are They Different? The JavaScript-based API keeps an HTTP stream open and receiving updates until it is eventually closed. At the time, it was an experimental technology meant to push content from a server to the client - or web browser - only when new events or updates occurred.įirst, the client establishes a connection using the EventSource interface. The protocol is based on something called Server-Sent DOM Events, which was introduced in the Opera 9 web browser. SSE or Server-Sent Events, on the other hand, appeared much later, in 2006. More recently, MQTT has become a go-to protocol for IoT solutions. MQTT has since become the accepted protocol for similar applications, bridging connections between devices with limited CPU power, battery restrictions and unpredictable communication instances. It was achieved by syncing the pipeline connection up with a network of satellites. Initially, it powered the connection between sections of a desert pipeline for active monitoring. It also incorporated varying levels of Quality of Service (QoS). The idea was to create a lightweight machine-to-machine communication protocol that worked even on limited networks with low bandwidth, unpredictable connectivity and also on low-power devices. Two well-known developers - Andy Stanford-Clark of IBM and Arlen Nipper of Eurotech - published the protocol that year. MQTT, or Message Queuing Telemetry Transport, is a publish-subscribe messaging protocol that first appeared back in 1999. Today, we’re going to take a look at MQTT and Server-Sent Events (SSE), specifically, to see how they compare. You do this by using long polling, WebSockets, Server-Sent Events (SSE) or HTTP2 Push. When you need data to flow from the server to the client quickly, a persistent connection is necessary. That’s because the protocol you choose to deliver data from the server to the client - and back - will have a significant impact on the overall experience. Building a real-time web or mobile application is a bit more challenging than building a standard service.
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