Merge 4ad07e01ee4045d47253a7b280444e411bb26def into 14724aeb2a63a6671eb7079d89ab63770c3e791f

IO_Modbus.cpp

@@ -17,7 +17,7 @@
  *  You should have received a copy of the GNU General Public License
  *  along with CommandStation.  If not, see <https://www.gnu.org/licenses/>.
  */
-
+#if defined(MBEXPERIMENTAL) || defined(ARDUINO_ARCH_STM32)
 #include "IO_Modbus.h"
 #include "defines.h"
 void ModbusADU::setTransactionId(uint16_t transactionId) {
@@ -646,3 +646,4 @@ Modbusnode::Modbusnode(VPIN firstVpin, int nPins, uint8_t busNo, uint8_t nodeID,
   }
   
 }
+#endif

IO_Modbus.h

@@ -51,7 +51,7 @@
 
 #ifndef IO_MODBUS_H
 #define IO_MODBUS_H
-
+#if defined(MBEXPERIMENTAL) || defined(ARDUINO_ARCH_STM32)
 #include "IODevice.h"
 class ModbusADU {
   public:
@@ -408,5 +408,5 @@ public:
   }
 };
 
-
+#endif
 #endif // IO_MODBUS_H