Poll for realtime usage updates

1 files changed, 24 insertions, 0 deletions

diff --git a/routes/energy-usage.js b/routes/energy-usage.js
new file mode 100644
index 0000000..847248d
--- /dev/null
+++ b/routes/energy-usage.js
@@ -0,0 +1,24 @@
+const express = require('express');
+const router = express.Router();
+
+const deviceManager = require('../services/device-manager');
+
+router.get('/:deviceId/realtime', function(req, res, next) {
+  
+  let deviceId = req.params.deviceId;
+
+  let realtimeUsage = {};
+  // TODO - cache results with a short TTL so we don't hammer the plug if multiple clients are requesting data
+  deviceManager.getDevice(deviceId).emeter.getRealtime().then(response => {
+
+    // Voltage seems to be reported as its peak to peak voltage, not RMS.
+    // Show the RMS value since thats what would you expect to see.
+    // i.e. 220v not 310v (in the U.K)
+    response.voltage = response.voltage / Math.sqrt(2);
+
+    res.json(response);
+  });
+
+});
+
+module.exports = router;
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