Please don’t send duplicate requests. This is basically the same question as the one already answered previously in How to retrieve the current playing asset using API?. If you have a followup question, please respond in the same post.
You cannot send MQTT from within info-beamer’s Lua environment. The only way to send data out is to use the node.client_write function, which sends out the given string to all connected clients. Use either the ibquery linked in the other post or implement your own line based TCP client by connecting to localhost:4444 from your running package service.
The protocol is line based with \n as end of line. > denoting data you send, < for data received from info-beamer.
< Info Beamer [more info..]. *help to get help.\n
> *raw/root\n
< ok!\n
from this point onwards, every line (ending in \n) triggers the input node event.
Once you complete the above handshake, the connect event is triggered and you can for example save the provided client value in a table and later iterate over that table and use each value as an argument to client_write to send data to each client. Similarly to `connect, the disconnect event is triggered for each client disconnecting from info-beamer.
The minimal implementation to send out data to all connected clients is therefore:
local clients = {}
node.event("connect", function(client, path)
clients[client] = true -- add to list of connected clients
end)
node.event("disconnect", function(client)
clients[client] = nil -- remove from list
end)
local function send_to_all_clients(data)
for client, _ in pairs(clients) do
node.client_write(client, data)
end
end
-- Then later at any point use for example the following.
-- JSON for encoding makes it easy to send structured data and the
-- result will end up being a single line, ending in \n sent to all
-- connected TCP clients.
local json = require "json"
send_to_all_clients(json.encode({"foo" = "bar"}))