update packages, add back eventstream testing

mock-api/es_server.ts

@@ -0,0 +1,67 @@
+import express from 'express';
+
+const rest_server = express();
+
+const port = 3081;
+
+const ES_ENDPOINT_ROOT = '/es/';
+const ES_LOG_ENDPOINT = ES_ENDPOINT_ROOT + 'log';
+
+const INTERVAL = 2000;
+
+function pad(number) {
+  var r = String(number);
+  if (r.length === 1) {
+    r = '0' + r;
+  }
+  return r;
+}
+
+// e.g. 2024-03-29 07:02:37.856
+Date.prototype.toISOString = function () {
+  return (
+    this.getUTCFullYear() +
+    '-' +
+    pad(this.getUTCMonth() + 1) +
+    '-' +
+    pad(this.getUTCDate()) +
+    ' ' +
+    pad(this.getUTCHours()) +
+    ':' +
+    pad(this.getUTCMinutes()) +
+    ':' +
+    pad(this.getUTCSeconds()) +
+    '.' +
+    String((this.getUTCMilliseconds() / 1000).toFixed(3)).slice(2, 5)
+  );
+};
+
+rest_server.get(ES_LOG_ENDPOINT, (_req, res) => {
+  res.writeHead(200, {
+    Connection: 'keep-alive',
+    'Cache-Control': 'no-cache',
+    'Content-Type': 'text/event-stream'
+  });
+
+  let count = 0;
+  const interval = setInterval(() => {
+    const data = {
+      t: new Date().toISOString(),
+      l: 3, // error
+      i: count,
+      n: 'system',
+      m: 'message #' + count++
+    };
+    res.write(`data: ${JSON.stringify(data)}\n\n`);
+  }, INTERVAL);
+
+  // if client closes connection
+  res.on('close', () => {
+    console.log('Closing ES connection');
+    clearInterval(interval);
+    res.end();
+  });
+});
+
+// start eventsource server
+rest_server.listen(port, () => console.log(`EMS-ESP EventSource server running on http://localhost:${port}/`));