from the extensions directory App Inventor Extensions | Pura Vida Apps
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Web Socket Client Extension by Andres Daniel - web.archive.org link, Appybuilder community has been closed
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SocketIO Client Extension by kevinkun (10 USD)
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SOcketIOClient Extension by airD (price to be defined)
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SocketIO Client Extension by vkpdeveloper (200 Rs)
Taifun