scheduler/mqtt running assync with psram, sync without psram

src/emsesp.cpp

@@ -1538,6 +1538,7 @@ EMSESP::EMSESP()
 // start all the core services
 // the services must be loaded in the correct order
 void EMSESP::start() {
+    system_.PSram(ESP.getPsramSize());
 // don't need shell if running unit tests
 #ifndef EMSESP_UNITY
     // Serial console's shell
@@ -1669,6 +1670,9 @@ void EMSESP::loop() {
         publish_all_loop();        // with HA messages in parts to avoid flooding the mqtt queue
         mqtt_.loop();              // sends out anything in the MQTT queue
         webModulesService.loop();  // loop through the external library modules
+        if (system_.PSram() == 0) {
+            webSchedulerService.loop();
+        }
 
         // force a query on the EMS devices to fetch latest data at a set interval (1 min)
         scheduled_fetch_values();

src/system.cpp

@@ -485,7 +485,6 @@ void System::start() {
 
     // get current memory values
     fstotal_ = LittleFS.totalBytes() / 1024; // read only once, it takes 500 ms to read
-    psram_   = ESP.getPsramSize() / 1024;
     appused_ = ESP.getSketchSize() / 1024;
     appfree_ = esp_ota_get_running_partition()->size / 1024 - appused_;
     refreshHeapMem(); // refresh free heap and max alloc heap

src/system.h

@@ -246,6 +246,10 @@ class System {
     uint32_t FStotal() {
         return fstotal_;
     }
+
+    void PSram(uint32_t psram) {
+        psram_ = psram / 1024;
+    }
     uint32_t PSram() {
         return psram_;
     }

src/web/WebSchedulerService.cpp

@@ -39,7 +39,9 @@ void WebSchedulerService::begin() {
     snprintf(topic, sizeof(topic), "%s/#", F_(scheduler));
     Mqtt::subscribe(EMSdevice::DeviceType::SCHEDULER, topic, nullptr); // use empty function callback
 #ifndef EMSESP_STANDALONE
-    xTaskCreate((TaskFunction_t)scheduler_task, "scheduler_task", 4096, NULL, 1, NULL);
+    if (EMSESP::system_.PSram()) {
+        xTaskCreate((TaskFunction_t)scheduler_task, "scheduler_task", 4096, NULL, 1, NULL);
+    }
 #endif
 }