websocket keepalive

apps/postData.js

@@ -7,4 +7,8 @@ setInterval(() => {
     socket.send(JSON.stringify(data))
 
     console.log(`indoor: ${data.indoorTemp / 100}°C, outdoor: ${data.outdoorConnected} - ${data.outdoorTemp / 100}°C`)
-}, process.env.DATA_POST_INTERVAL * 1000)
+}, process.env.DATA_POST_INTERVAL * 1000)
+
+setInterval(() => {
+    socket.send(process.env.BACKEND_KEEPALIVE_STRING)
+}, 10000)