feat: new demo for rtm onoff status

Author: zapcannon87

functions/rtm-onoff-status.js

@@ -0,0 +1,24 @@
+var AV = require('leanengine');
+
+var redis = require("redis"),
+    redisClient = redis.createClient(process.env['REDIS_URL_rtm_onoff_status']);
+
+redisClient.on("error", function (err) {
+    console.log("Redis Error: " + err);
+});
+
+const {promisify} = require('util');
+const mgetAsync = promisify(redisClient.mget).bind(redisClient);
+
+AV.Cloud.define('_clientOnline', async function(request) {
+  redisClient.set(request.params.peerId, true);
+});
+
+AV.Cloud.define('_clientOffline', async function(request) {
+  redisClient.set(request.params.peerId, false);
+});
+
+AV.Cloud.define('getOnOffStatus', async function(request) {
+  const res = await mgetAsync(request.params.peerIds);
+  return res;
+});