First working integration using airgradientClient

src/AirGradient.cpp

@@ -85,3 +85,7 @@ String AirGradient::deviceId(void) {
   mac.toLowerCase();
   return mac;
 }
+
+std::string AirGradient::getDeviceId(void) {
+  return std::string(deviceId().c_str());
+}

src/AirGradient.h

@@ -212,6 +212,8 @@ public:
    */
   String deviceId(void);
 
+  std::string getDeviceId(void);
+
 private:
   BoardType boardType;
 };