Initial air quality telemetry feature

src/modules/Telemetry/AirQualityTelemetry.h

@@ -0,0 +1,37 @@
+#pragma once
+#include "../mesh/generated/meshtastic/telemetry.pb.h"
+#include "Adafruit_PM25AQI.h"
+#include "NodeDB.h"
+#include "ProtobufModule.h"
+
+class AirQualityTelemetryModule : private concurrency::OSThread, public ProtobufModule<meshtastic_Telemetry>
+{
+  public:
+    AirQualityTelemetryModule()
+        : concurrency::OSThread("AirQualityTelemetryModule"),
+          ProtobufModule("AirQualityTelemetry", meshtastic_PortNum_TELEMETRY_APP, &meshtastic_Telemetry_msg)
+    {
+        lastMeasurementPacket = nullptr;
+        setIntervalFromNow(10 * 1000);
+        aqi = Adafruit_PM25AQI();
+    }
+
+  protected:
+    /** Called to handle a particular incoming message
+    @return true if you've guaranteed you've handled this message and no other handlers should be considered for it
+    */
+    virtual bool handleReceivedProtobuf(const meshtastic_MeshPacket &mp, meshtastic_Telemetry *p) override;
+    virtual int32_t runOnce() override;
+    /**
+     * Send our Telemetry into the mesh
+     */
+    bool sendTelemetry(NodeNum dest = NODENUM_BROADCAST, bool wantReplies = false);
+
+  private:
+    Adafruit_PM25AQI aqi;
+    PM25_AQI_Data data;
+    bool firstTime = 1;
+    meshtastic_MeshPacket *lastMeasurementPacket;
+    uint32_t sendToPhoneIntervalMs = SECONDS_IN_MINUTE * 1000; // Send to phone every minute
+    uint32_t lastSentToMesh = 0;
+};