inlude unistd.h (close)

Author: NikolasK-source

src/Modbus_TCP_Client_poll.hpp

@@ -11,6 +11,7 @@
 #include <unordered_map>
 #include <unordered_set>
 #include <vector>
+#include <unistd.h>
 
 namespace Modbus {
 namespace TCP {