fix(timers): Allow execution of timers if time is plausible

backend/lib/scheduler/Scheduler.js

@@ -1,4 +1,5 @@
 const Logger = require("../Logger");
+const Tools = require("../utils/Tools");
 const ValetudoFanSpeedControlTimerPreAction = require("./pre_actions/ValetudoFanSpeedControlTimerPreAction");
 const ValetudoFullCleanupTimerAction = require("./actions/ValetudoFullCleanupTimerAction");
 const ValetudoNTPClientDisabledState = require("../entities/core/ntpClient/ValetudoNTPClientDisabledState");
@@ -32,15 +33,23 @@ class Scheduler {
     }
 
     evaluateTimers() {
-        if (
-            !(
-                this.ntpClient.state instanceof ValetudoNTPClientSyncedState ||
-                this.ntpClient.state instanceof ValetudoNTPClientDisabledState
-            ) && this.config.get("embedded") === true
-        ) {
-            // Since some robots have no rtc, we absolutely require a synced time when embedded
-            // Therefore, we're aborting without it unless you explicitly disable the NTPClient
-            // In that case you're on your own to provide the correct time to the robot
+        const NTPClientStateIsValid = this.ntpClient.state instanceof ValetudoNTPClientSyncedState;
+        const isEmbedded = this.config.get("embedded") === true;
+        const hasBuildTimestamp = Tools.GET_BUILD_TIMESTAMP() > new Date(-1);
+        const timeIsPlausible = Tools.GET_BUILD_TIMESTAMP() < new Date();
+
+        let shouldEvaluateTimers;
+        if (isEmbedded) {
+            shouldEvaluateTimers = NTPClientStateIsValid || (hasBuildTimestamp && timeIsPlausible);
+        } else {
+            if (hasBuildTimestamp) {
+                shouldEvaluateTimers = timeIsPlausible;
+            } else { // Probably dev env
+                shouldEvaluateTimers = true;
+            }
+        }
+
+        if (!shouldEvaluateTimers) {
             return;
         }
 

frontend/src/valetudo/timers/res/TimersHelp.ts

@@ -3,16 +3,8 @@ export const TimersHelp = `
 ## Timers
 
 Timers allow you to execute a task at a specified time (UTC).<br/>
-To operate, they require the system time to be synced using the NTP client built into Valetudo.
-If it is unable to reach the configured NTP server, no timers will be
-executed unless the NTP client was disabled explicitly which would
-imply the user is responsible for providing time by other means.
-
-**Please note that timers are evaluated and stored as UTC. They are only displayed in your current browser timezone
-for your convenience.**
-
-Timers in Valetudo are provided as a convenience feature.<br/>
-It is **highly recommended** to deploy a full-scale home automation system such as openHAB or Home Assistant to allow for
-better scheduled operation taking into account e.g. whether or not a room is currently occupied, you're currently on vacation etc.
+If the system time isn't plausible (e.g. like when it has never been synced), no timers will be executed.
 
+Please note that timers are evaluated and stored as UTC. They are only displayed in your current browser timezone.<br/>
+This means that they will not follow any DST rules and thus will have to be updated manually if so required.
 `;