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| 1 | +# SPDX-FileCopyrightText: 2023 Dan Halbert for Adafruit Industries |
| 2 | +# |
| 3 | +# SPDX-License-Identifier: Unlicense |
| 4 | + |
| 5 | +from time import monotonic |
| 6 | +import socketpool |
| 7 | +import wifi |
| 8 | + |
| 9 | +from adafruit_httpserver import Server, Request, Response, Websocket, GET |
| 10 | + |
| 11 | + |
| 12 | +pool = socketpool.SocketPool(wifi.radio) |
| 13 | +server = Server(pool, debug=True) |
| 14 | + |
| 15 | + |
| 16 | +websocket: Websocket = None |
| 17 | +next_message_time = monotonic() |
| 18 | + |
| 19 | +HTML_TEMPLATE = """ |
| 20 | +<html lang="en"> |
| 21 | + <head> |
| 22 | + <title>Websocket Client</title> |
| 23 | + </head> |
| 24 | + <body> |
| 25 | + <input id="message" type="text" placeholder="Message..."><br> |
| 26 | + <button id="send">Send</button> |
| 27 | +
|
| 28 | +
|
| 29 | + <script> |
| 30 | + const messageInput = document.querySelector('#message'); |
| 31 | + const sendButton = document.querySelector('#send'); |
| 32 | +
|
| 33 | + let ws = new WebSocket('ws://' + location.host + '/connect-websocket'); |
| 34 | +
|
| 35 | + ws.onopen = () => console.log('WebSocket connection opened'); |
| 36 | + ws.onerror = error => console.error('WebSocket error:', error); |
| 37 | + ws.onmessage = event => console.log('Received message from server: ', event.data); |
| 38 | +
|
| 39 | + let interval = setInterval(() => ws.send("Hello from client"), 1000); |
| 40 | +
|
| 41 | + ws.onclose = x => { |
| 42 | + console.log('WebSocket connection closed'); |
| 43 | + clearInterval(interval); |
| 44 | + }; |
| 45 | +
|
| 46 | + sendButton.onclick = () => ws.send(messageInput.value); |
| 47 | + </script> |
| 48 | + </body> |
| 49 | +</html> |
| 50 | +""" |
| 51 | + |
| 52 | + |
| 53 | +@server.route("/client", GET) |
| 54 | +def client(request: Request): |
| 55 | + return Response(request, HTML_TEMPLATE, content_type="text/html") |
| 56 | + |
| 57 | + |
| 58 | +@server.route("/connect-websocket", GET) |
| 59 | +def connect_client(request: Request): |
| 60 | + global websocket |
| 61 | + |
| 62 | + if websocket is not None: |
| 63 | + websocket.close() # Close any existing connection |
| 64 | + |
| 65 | + websocket = Websocket(request) |
| 66 | + |
| 67 | + return websocket |
| 68 | + |
| 69 | + |
| 70 | +server.start(str(wifi.radio.ipv4_address)) |
| 71 | +while True: |
| 72 | + server.poll() |
| 73 | + |
| 74 | + # Check for incoming messages from client |
| 75 | + if websocket is not None: |
| 76 | + if (message := websocket.receive(True)) is not None: |
| 77 | + print("Received message from client:", message) |
| 78 | + |
| 79 | + # Send a message every second |
| 80 | + if websocket is not None and next_message_time < monotonic(): |
| 81 | + websocket.send_message("Hello from server") |
| 82 | + next_message_time = monotonic() + 1 |
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