Help for sending a websocket command

Morning, everyone,
To control my TV set-top box, it is possible to send it Websocket messages. I have intercepted messages in the Firefox console that are in the format :
{"Params":{"Token": "LAN", "Action": "ButtonEvent", "Press":[303]}}

My Websocket node is connected and I tried to send the message in several forms, strings, object...

Why doesn't it work?

A preview of the HTML remote control:
remote control

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