mongoose/examples/uart-bridge/web_root/main.js

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'use strict';
import {Component, h, html, render, useEffect, useState, useRef} from './preact.min.js';
const Message = m => html`<span
style="color: ${m.message.uart ? '#444' : '#373'};">
${m.message.data}
</span>`;
const App = function(props) {
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const [cfg, setCfg] = useState({tcp: {}, ws: {}, mqtt: {}});
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const [messages, setMessages] = useState([]);
const [connected, setConnected] = useState(false);
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const [txt, setTxt] = useState('');
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const [ws, setWs] = useState(null);
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const [rx, setRx] = useState('');
const [tx, setTx] = useState('');
const [baud, setBaud] = useState('');
const [tcpport, setTcpport] = useState(4001);
const [wsport, setWsport] = useState(4002);
const [mqtt, setMqtt] = useState('');
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// const tcp_port = cfg.tcp.split(':')[2] || 4001;
// const ws_port = cfg.ws.split(':')[2] || 4002;
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const refresh = () => fetch('/api/config/get').then(r => r.json()).then(r => {
setTx(r.tx), setRx(r.rx), setBaud(r.baud), setCfg(r);
setTcpport(r.tcp.url.split(':')[2] || 4001);
setWsport(r.ws.url.split(':')[2] || 4002);
setMqtt(r.mqtt.url);
});
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const watchWebsocket = function() {
// Connect to websocker port, to implement WS console
var reconnect = function() {
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var port;
setWsport(x => port = x);
var l = window.location, proto = l.protocol.replace('http', 'ws');
var tid, url = `${proto}//${l.hostname}:${port}/ws`;
// console.log(url);
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var ws = new WebSocket(url);
ws.onopen = () => {
setConnected(true);
setWs(ws);
};
ws.onmessage = ev => {
// console.log(ev, ev.data);
setMessages(x => x.concat([{data: ev.data, uart: true}]));
};
ws.onclose = function() {
clearTimeout(tid);
tid = setTimeout(reconnect, 1000);
setConnected(false);
setWs(null);
};
};
reconnect();
};
useEffect(() => {
refresh();
watchWebsocket();
}, []);
const sendmessage = ev => {
setMessages(x => x.concat([{data: txt + '\n', uart: false}]));
if (ws) ws.send(txt + '\n');
setTxt('');
};
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const onchange = ev => false;
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return html`
<div class="container">
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<h1 style="margin-bottom: 0;">UART \u27F7 network bridge </h1>
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<pre class="d-none">${JSON.stringify(cfg, null, 2)}</pre>
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<div class="row">
<div class="col col-4">
<h3>UART configuration</h3>
<div class="d-flex pr-1 my-1">
<label class="addon">UART TX pin</label>
<input style="width: 5em;" value=${tx} onchange=${onchange}
oninput=${ev => setTx(ev.target.value)} />
</div><div class="d-flex pr-1 my-1">
<label class="addon">UART RX pin</label>
<input style="width: 5em;" value=${rx} onchange=${onchange}
oninput=${ev => setRx(ev.target.value)} />
</div><div class="d-flex pr-1 my-y">
<label class="addon">UART Baud</label>
<input style="width: 5em;" value=${baud} onchange=${onchange}
oninput=${ev => setBaud(ev.target.value)} />
</div>
</div>
<div class="col col-8">
<h3>Network configuration</h3>
<div class="d-flex my-1">
<label class="addon">Local TCP port</label>
<input style="min-width: 4em; flex: 1 100%;"
value=${tcpport} onchange=${onchange}
oninput=${ev => setTcpport(ev.target.value)} />
<label class="ml-1 d-flex label"><input type="checkbox"
checked=${cfg.tcp.enable} /> enable</label>
</div><div class="d-flex my-1">
<label class="addon">Local WS port</label>
<input style="flex: 1 100%;"
value=${wsport} onchange=${onchange}
oninput=${ev => setWsport(ev.target.value)} />
<label class="ml-1 d-flex label"><input type="checkbox"
checked=${cfg.ws.enable} /> enable</label>
</div><div class="d-flex my-1">
<label class="addon">Remote MQTT</label>
<input style="flex: 1 100%;"
value=${mqtt} onchange=${onchange}
oninput=${ev => setMqtt(ev.target.value)} />
<label class="ml-1 d-flex label"><input type="checkbox"
checked=${cfg.mqtt.enable} /> enable</label>
</div>
</div>
</div>
<div class="msg">
Note: to connect over MQTT,
go to <a href="http://www.hivemq.com/demos/websocket-client/">
console</a>, subscribe to b/tx and publish to b/rx<br/>
Note: to connect over TCP, use netcat utility:<br/>
$ nc ${location.hostname} ${tcpport}
</div>
<div style="margin-top: 2em;">
<b>UART console</b><span style="margin-left: 1em; color: #777;">works
over the local WS port. WebSocket status: </span><span
style="color: ${connected ? 'teal' : 'red'};">
\u25cf ${connected ? 'connected' : 'disconnected'} </span>
</div>
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<div style="margin: 0.5em 0; display: flex">
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<input placeholder="to send data, type and press enter..." style="flex: 1 100%;"
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value=${txt} onchange=${sendmessage}
oninput=${ev => setTxt(ev.target.value)} />
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<button style="margin-left: 1em;"
onclick=${ev => setMessages([])}>clear</button>
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</div>
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<pre style="height: 15em; overflow: auto;">
${messages.map(message => h(Message, {message}))}
</pre>
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</div>`;
};
window.onload = () => render(h(App), document.body);