added webUI Preact-based example

examples/webui-preact/Makefile

@@ -0,0 +1,20 @@
+PROG ?= example
+SSL = ?
+
+ifeq "$(SSL)" "MBEDTLS"
+CFLAGS += -DMG_ENABLE_MBEDTLS=1 -lmbedtls -lmbedcrypto -lmbedx509
+endif
+
+ifeq "$(SSL)" "OPENSSL"
+CFLAGS += -DMG_ENABLE_OPENSSL=1 -lssl -lcrypto
+endif
+
+all: $(PROG)
+	$(DEBUGGER) ./$(PROG) $(ARGS)
+
+
+$(PROG): main.c
+	$(CC) ../../mongoose.c -I../.. -W -Wall $(CFLAGS) $(EXTRA_CFLAGS) -o $(PROG) main.c
+
+clean:
+	rm -rf $(PROG) *.o *.dSYM *.gcov *.gcno *.gcda *.obj *.exe *.ilk *.pdb

examples/webui-preact/ca.pem

@@ -0,0 +1 @@
+../../test/data/ca.pem

examples/webui-preact/main.c

@@ -0,0 +1 @@
+../webui-plain/main.c

examples/webui-preact/web_root/index.html

@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <link rel="stylesheet" href="style.css" />
+  </head>
+  <body></body>
+  <script type="module" src="main.js"></script>
+</html>

examples/webui-preact/web_root/main.js

@@ -0,0 +1,86 @@
+'use strict';
+import { h, html, render, useEffect, useState } from './preact.min.js';
+
+
+const Configuration = function (props) {
+  const [url, setUrl] = useState(props.config.url || '');
+  const [pub, setPub] = useState(props.config.pub || '');
+  const [sub, setSub] = useState(props.config.sub || '');
+
+  useEffect(() => {
+    setUrl(props.config.url);
+    setPub(props.config.pub);
+    setSub(props.config.sub);
+  }, [props.config]);
+
+  const update = (name, val) =>
+    fetch('/api/config/set', {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json'
+      },
+      body: JSON.stringify({
+        [name]: val
+      })
+    })
+      .catch(err => {
+        console.log(err);
+        enable(false);
+      });
+
+  const updateurl = ev => update('url', url);
+  const updatepub = ev => update('pub', pub);
+  const updatesub = ev => update('sub', sub);
+
+  return html`
+<h3 style="background: #c03434; color: #fff; padding: 0.4em;">
+  Device Configuration</h3>
+<div style="margin: 0.5em 0; display: flex;">
+  <span class="addon nowrap">MQTT server:</span>
+  <input type="text" style="flex: 1 100%;"
+        value=${url} onchange=${updateurl}
+        oninput=${ev => setUrl(ev.target.value)} />
+  <button class="btn" disabled=${!url} onclick=${updateurl}
+    style="margin-left: 1em; background: #8aa;">Update</button>
+</div>
+<div style="margin: 0.5em 0; display: flex; ">
+  <span class="addon nowrap">Subscribe topic:</span>
+  <input type="text" style="flex: 1 100%;"
+      value=${sub} onchange=${updatesub}
+      oninput=${ev => setSub(ev.target.value)} />
+  <button class="btn" disabled=${!sub} onclick=${updatesub}
+    style="margin-left: 1em; background: #8aa;">Update</button>
+</div>
+<div style="margin: 0.5em 0; display: flex;">
+  <span class="addon nowrap">Publish topic:</span>
+  <input type="text" style="flex: 1 100%;"
+        value=${pub} onchange=${updatepub}
+        oninput=${ev => setPub(ev.target.value)} />
+  <button class="btn" disabled=${!pub} onclick=${updatepub}
+    style="margin-left: 1em; background: #8aa;">Update</button>
+</div>`;
+};
+
+
+const App = function (props) {
+  const [config, setConfig] = useState({});
+
+  const getconfig = () =>
+    fetch('/api/config/get')
+      .then(r => r.json())
+      .then(r => setConfig(r))
+      .catch(err => console.log(err));
+
+  useEffect(() => {
+    getconfig();
+  }, []);
+
+  return html`
+<h1>Basic Preact-based UI demo</h1>
+<div class="col col-6">
+  ${h(Configuration, { config })}
+</div>
+<button onclick=${getconfig}>Get configuration</button>`;
+};
+
+window.onload = () => render(h(App), document.body);

examples/webui-preact/web_root/preact.min.js

@@ -0,0 +1 @@
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examples/webui-preact/web_root/style.css

@@ -0,0 +1,43 @@
+* { box-sizing: border-box; }
+html, body { margin: 0; padding: 0; height: 100%; font: 16px sans-serif; }
+select, input, label::before, textarea { outline: none; box-shadow:none !important; border: 1px solid #ccc !important; }
+code, pre { color: #373; font-family: monospace; font-weight: bolder; font-size: smaller; background: #ddd; padding: 0.1em 0.3em; border-radius: 0.2em; }
+textarea, input, .addon { font-size: 15px; border: 1px solid #ccc; padding: 0.5em; }
+a, a:visited, a:active { color: #55f; }
+.addon { background: #eee;  min-width: 9em;}
+.btn {
+  background: #ccc; border-radius: 0.3em; border: 0; color: #fff; cursor: pointer;
+  display: inline-block; padding: 0.6em 2em; font-weight: bolder;
+}
+.btn[disabled] { opacity: 0.5; cursor: auto;}
+.smooth { transition: all .2s; }
+.container { margin: 0 20px; width: auto; }
+.d-flex { display: flex; }
+.d-none { display: none; }
+.border { border: 1px solid #ddd; }
+.rounded { border-radius: 0.5em; }
+.nowrap { white-space: nowrap; }
+.msg { background: #def; border-left: 5px solid #59d; padding: 0.5em; font-size: 90%; margin: 1em 0; }
+.section { margin: 0 1em; }
+.topic, .data, .qos {  padding: 0.2em 0.5em; border-radius: 0.4em; margin-right: 0.5em;  }
+.qos { background: #efa; }
+.topic { background: #fea; }
+.data { background: #aef; }
+
+/* Grid */
+.row { display: flex; flex-wrap: wrap; }
+.col { margin: 0; padding: 0; overflow: auto; }
+.col-12 { width: 100%; }
+.col-11 { width: 91.66%; }
+.col-10 { width: 83.33%; }
+.col-9 { width: 75%; }
+.col-8 { width: 66.66%; }
+.col-7 { width: 58.33%; }
+.col-6 { width: 50%; }
+.col-5 { width: 41.66%; }
+.col-4 { width: 33.33%; }
+.col-3 { width: 25%; }
+.col-2 { width: 16.66%; }
+.col-1 { width: 8.33%; }
+@media (min-width: 1310px) { .container { margin: auto; width: 1270px; } }
+@media (max-width: 920px) { .row .col { width: 100%; } }