Fix multiple Bsec initializations

Author: facchinm

src/Arduino_MKRIoTCarrier.cpp

@@ -23,7 +23,10 @@
 //Touch pads values for using the case or just directly on the board
 //Define on the sketch to use it
 bool CARRIER_CASE = false;
-    
+
+mkr_iot_carrier_rev2 mkr_iot_carrier_rev2_instance;
+Bsec* mkr_iot_carrier_rev2::iaqSensor;
+
 MKRIoTCarrier::MKRIoTCarrier() {
 }
 
@@ -34,6 +37,7 @@ int MKRIoTCarrier::begin() {
   pinMode(AREF_PIN,INPUT_PULLUP);
   if (digitalRead(AREF_PIN) == LOW) {
     MKRIoTCarrier::_revision = BOARD_REVISION_2;
+    mkr_iot_carrier_rev2::iaqSensor = nullptr;
   } else {
     MKRIoTCarrier::_revision = BOARD_REVISION_1;
   }

src/MKRIoTCarrierDefines.h

@@ -62,8 +62,9 @@ namespace mkr_iot_carrier_rev1 {
     };
 };
 
-namespace mkr_iot_carrier_rev2 {
-    static Bsec *iaqSensor = nullptr;
+class mkr_iot_carrier_rev2 {
+public:
+    static Bsec *iaqSensor;
     enum relays {
         RELAY1 = 1,
         RELAY2 = 2,
@@ -85,6 +86,8 @@ namespace mkr_iot_carrier_rev2 {
     };
 };
 
+extern mkr_iot_carrier_rev2 mkr_iot_carrier_rev2_instance;
+
 #define BME_SLAVE_ADDRESS   0x76
 
 #define LSM6DSOX_ADDRESS           0x6A