Added check for at least one valid port.

server/main.cpp

@@ -10,6 +10,7 @@
 #include <time.h>
 #include <string.h>
 #include <libserialport.h>
+#include <stdlib.h>
 #include <fcntl.h>
 #include <dirent.h>
 #include <sys/stat.h>
@@ -161,6 +162,12 @@ int main(void)
 		sp_free_port_list(ports);
 	}
 
+	if (iValidPortCount == 0)
+	{
+		printf("Err: No valid port\n");
+		return EXIT_FAILURE;
+	}
+
 // TODO: Add server shutdown
 	while (1)
 	{