feat: add a simple webserver

load up client-side mqtt code, and static html website

src/mqtt.mjs

@@ -0,0 +1,45 @@
+import mosca from 'mosca';
+
+// source: https://github.com/mcollina/mosca/wiki/Mosca-basic-usage
+
+export default function createMQTTServer(port = 1883) {
+  const moscaSettings = {
+    port,
+    persistence: {
+      factory: mosca.persistence.LevelUp,
+      path: 'db',
+    },
+  };
+
+  const server = new mosca.Server(moscaSettings);
+
+  const setup = () => {
+    console.log('Mosca server is up and running on port:', moscaSettings.port);
+
+    const message = {
+      topic: '/hello/world',
+      payload: 'abdce', // or a Buffer
+      qos: 0, // 0, 1, or 2
+      retain: true, // retain message for future subscribers
+    };
+
+    console.log('--- server publishing to mqtt ---');
+    server.publish(message, () => {
+      console.log('message published!');
+    });
+  };
+
+  server.on('ready', setup);
+
+  // fired when a message is published
+  server.on('published', packet => {
+    console.log(
+      'published event',
+      packet.retain ? '(persisted)' : '',
+      packet.topic,
+      packet.payload
+    );
+  });
+
+  return server;
+}