Add online/offline logic

CL: Add online/offline logic

PUBLISHED_FROM=100e4d2535371bde936e65f495c19ab0313a6caa

fs/init.js

@@ -1,4 +1,5 @@
 load('api_config.js');
+load('api_events.js');
 load('api_gpio.js');
 load('api_shadow.js');
 load('api_timer.js');
@@ -7,7 +8,7 @@ load('api_sys.js');
 let led = Cfg.get('board.led1.pin');           // Built-in LED GPIO number
 let onhi = Cfg.get('board.led1.active_high');  // LED on when high?
 let state = {on: false, uptime: 0};            // Device state
-let timer = null;                              // Initialize when connected
+let online = false;                            // Connected to the cloud?
 
 let setLED = function(on) {
   let level = onhi ? on : !on;
@@ -19,33 +20,34 @@ GPIO.set_mode(led, GPIO.MODE_OUTPUT);
 setLED(state.on);
 
 let reportState = function() {
-  state.uptime = Sys.uptime();
   print(JSON.stringify(state));
   Shadow.update(0, state);
 };
 
+// Update state every second, and report to cloud if online
+Timer.set(1000, Timer.REPEAT, function() {
+  state.uptime = Sys.uptime();
+  if (online) reportState();
+}, null);
+
 // Set up Shadow handler to synchronise device state with the shadow state
 Shadow.addHandler(function(event, obj) {
-  if (event === 'CONNECTED') {
-    print('Connected to the device shadow');
-    print('  Reporting our current state..');
-    Shadow.update(0, state);  // Report current state. This may generate the
-                              // delta on the cloud, in which case the
-                              // cloud will send UPDATE_DELTA to us
-
-    print('  Setting up timer to periodically report device state..');
-    if (!timer) timer = Timer.set(1000, Timer.REPEAT, reportState, null);
-
-  } else if (event === 'UPDATE_DELTA') {
+  if (event === 'UPDATE_DELTA') {
     print('GOT DELTA:', JSON.stringify(obj));
     for (let key in obj) {  // Iterate over all keys in delta
       if (key === 'on') {   // We know about the 'on' key. Handle it!
         state.on = obj.on;  // Synchronise the state
         setLED(state.on);   // according to the delta
-      } else {
-        print('Dont know how to handle key', key);
       }
     }
-    Shadow.update(0, state);  // Report our new state, hopefully clearing delta
+    reportState();  // Report our new state, hopefully clearing delta
   }
 });
+
+Event.on(Event.CLOUD_CONNECTED, function() {
+  online = true;
+}, null);
+
+Event.on(Event.CLOUD_DISCONNECTED, function() {
+  online = false;
+}, null);