MQTT.js VS µWebSockets

First, we build two client simulators, for the car and the application client. We use MQTTJS for Javascript and its MQTT v5 implementation support. Step 1 below will describe the details of the MQTT client implementation.

We will simulate the device behavior using an MQTT client application built with the MQTT.js open-source library.

Change your javascript to use MQTT.js instead of the no longer actively maintained paho library: https://github.com/mqttjs/MQTT.js/

This all points to the direction that the underlying JS-Engine in the Streamdeck software might throttle the outgoing connections. I still don't understand what's under the hood. The user agent returns "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) QtWebEngine/6.3.1 Chrome/94.0.4606.126 Safari/537.36" What's the JS Engine in the Software? Is it Chrome? As far as I know, there are some issues with Websocket disconnects in Chrome due to aggressive throttling of background tabs. Could that be the cause here, too? https://github.com/mqttjs/MQTT.js/issues/1268

Let's take an example of programming with JavaScript, using the MQTT.js client. We can first specify the version of MQTT as MQTT 5.0 when connecting to the client.

MQTT.js is a fully open-source client-side library for the MQTT protocol, written in JavaScript and available for Node.js and browsers. On the Node.js side, it can be installed via global installation and connected via the command line. Also, it supports MQTT/TCP, MQTT/TLS, MQTT/WebSocket connections. It is worth mentioning that MQTT.js also has good support for WeChat Mini Program.

using MQTT.js to connect to the broker directly from the frontend through WebSockets.

MQTT.js is a client library of the MQTT protocol, written in JavaScript and used in Node.js and browser environments. It is currently the most widely used MQTT client library in the JavaScript ecosystem.

They use (uWebSockets)[https://github.com/uNetworking/uWebSockets], which was written in C++, but has an interface to use in NodeJS. It's been really performant for me in my simple tests compared to other popular websocket libs that slow down fairly quickly.

µWebSockets, pronounced as "microWebSocket”, is a WebSocket library written in C++ and has Node.js bindings. Its design focuses on being efficient and scalable, making it ideal for applications that require high concurrency and low latency.

You can do that with any single threaded library that leaves threading to you. Like for example https://github.com/uNetworking/uWebSockets

Websockets are also pretty valuable for updating the page in real time, there are servers in many languages. I'm a big fan of https://github.com/uNetworking/uWebSockets which is C++ but also has JS bindings to use with Node.js.

Can you include uWebsockets? https://github.com/uNetworking/uWebSockets

μWebSockets Génial, rapide, peut transformer l’eau en vin. Nécessite C++17.

Not exaclty -- it looks like it's pretty overkill for my needs

I'm looking for something more like websocketpp[0], or even just grpc without a requisite proxy. uWebsockets looks really promising, being header only, but in the fine print requires a runtime library. unfortunately, none of that ecosystem seems to use cmake, making integrating it that much more of a pain.

why use cpp for this, I'm sure some HNer will ask. the ray tracer itself is using cuda, that's why. I've also debated

- running it as a grpc server and having some proxy in a more web-accessible language

- creating python bindings and using python to make a websocket/http server for it

neither of those are out of the question, but they're not my first choices, because I'd like to keep the build & execution simple. introducing dependencies, especially other executables, is in conflict with that.

i don't need anything particularly scalable -- a threaded implementation, or one using select() would be fine, if not preferable.

[0] https://docs.websocketpp.org/

[1] https://github.com/uNetworking/uWebSockets

Really cool i also made and CAPI for using WebSocket in C, https://github.com/uNetworking/uWebSockets/tree/master/capi

I will take a deep look on your project thanks for sharing!

We discover a really fast, small, and well maintained C++ Library called uNetworking/uWebSockets, but no C API available, so we create and adapt the full C API from uNetworking/uWebSockets and will integrate libuv powered fetch and file IO, this same C API is used by Bun