Scale default intervals based for *online* mesh size past 40 nodes (#4277)

* Add congestion scaling coefficient

* Added active mesh sized based interval scaling

* Moved back to bottom

* Format

* Add observers and use correct number of online nodes

src/modules/Telemetry/EnvironmentTelemetry.h

@@ -11,12 +11,17 @@
 
 class EnvironmentTelemetryModule : private concurrency::OSThread, public ProtobufModule<meshtastic_Telemetry>
 {
+    CallbackObserver<EnvironmentTelemetryModule, const meshtastic::Status *> nodeStatusObserver =
+        CallbackObserver<EnvironmentTelemetryModule, const meshtastic::Status *>(this,
+                                                                                 &EnvironmentTelemetryModule::handleStatusUpdate);
+
   public:
     EnvironmentTelemetryModule()
         : concurrency::OSThread("EnvironmentTelemetryModule"),
           ProtobufModule("EnvironmentTelemetry", meshtastic_PortNum_TELEMETRY_APP, &meshtastic_Telemetry_msg)
     {
         lastMeasurementPacket = nullptr;
+        nodeStatusObserver.observe(&nodeStatus->onNewStatus);
         setIntervalFromNow(10 * 1000);
     }
     virtual bool wantUIFrame() override;