Web socket plugin Ezlo E-450

Ezlo Plugins General Discussion
#1

Hello everyone

I am making a plugin to add to the E-450 controller where it will make a web socket connection to our server to receive the events that happen inside the controller. Has anyone worked on any of this in .lua? I have seen something similar done in python.

1 Like
#2

hi jose,

yes, you could create a socket connection with this lua code

require "network"
local _logger = require("logging")

socketConnection = network.connect( { ip = "192.168.1.100", port = "3000", connection_type = "TCP" } )

if not socketConnection then
    _logger.error("Fail to connect to socket server")
else
    _logger.info("Client connect to socket server")
end

remember to add the “network” module to the permissions in the config.json file

2 Likes
#3

How could a method be executed, from a Lua plugin, because I can’t find a functionality in the core module that returns the list of rooms

1 Like
#4

Hello, Jose.

You can use any existing Lua API functions to access the collections that the controller provides.
But, there is no such Lua call that provides a rooms list for now.

We can add it in case something is needed and that something isn’t violating security rules.

The way of obtaining something in a Lua plugin that is a part of WebSocket API is not the right way, I think.

It needs your code to support both secure and insecure ways of communication, for a secure one you need to update user credentials, etc.

To your question: there is no way to establish a WebSocket connection from a hub to an outer WebSocket server.
There is no such functionality, and it cannot be implemented without firmware support.

What we provide is a HTTP lua module to which make it possible to make queries outside of a hub in an asynchronous way.
There is no way to write and execute synchronous lua code on a hub.

So, to solve your task, I’d suggest you to make an HTTP connection from your “server” to the E450’s HTTP server .

Like, you can subscribe to all the broadcasts of a hub using this one: https://IP:17000/v1/broadcasts.

It will give you an SSE (Server-Side Events) stream of changes.
And, another one: /v1/request, will give you the ability to ask WebSocket API requests directly from the hub.

1 Like